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WALC Operations Study Report

2008-2009 Winter

OPERATINGSTUDIESREPORT

WESTERN DESERT SOUTHWEST REGION

August 21, 2008

Prepared by

Nick Saber


WALC BA OPERATING COMPREHENSIVE STUDY REPORT2008-2009

Table of Contents

PAGE

1. Executive Summary 1

2. Purpose 2

3. Background 3

4. Conclusions 7

5. Findings 8 Power Flow Analysis Short Circuit Studies Stability Analysis

6. Study Assumptions 12

7. Methodology 13

8. Base Case Development 14

9. Operating Nomograms 15

10. Blythe Matrix 36


REFERENCES

1. Power System’s Dispatcher SOP 510

2. Facility Ratings Methodology, May 2007

3. SYSTEM OPERATING LIMITS (SOL) METHODOLOGYFOR SYSTEM PLANNING May, 2007

4. DSW Voltage Stability AssessmentAugust 31, 2007 - Appendix D - Detail Listing of System Voltage Performance Violations

APPENDICIES

Appendix A Study Plan 7Appendix B WALC Study CriteriaAppendix C ReservedAppendix D Stability Plots (PDF) (available upon request)Appendix E Blythe Matrix (.xls)Appendix F Distribution Factors (.xls) ) (available upon request)

ATTACHMENTS(available upon request)

Attachment A WECC approved cases and associated dynamic files Attachment B.1 study results for N-0 Attachment B.2 study results for N-2 Attachment B.3 category C cases and dynamics Attachment C planning methodology and procedures Attachment D Arizona Security Manual - year 08Attachment E past season/years studies Attachment F Extended List of DSW N-1 OutagesAttachment G Extended List of WALC N-2 Outages Attachment H DSW Grounding Requirements


1.0 EXECUTIVE SUMMARY

The findings from this transmission system assessment support that the Western DSW Transmission System can perform reliably and as required in the NERC/WECC applicable standards shown below.

This comprehensive system operating study is performed to confirm the system operating limits SOL for the 08-09 Winter operating season. Since the results of the study do not show any WALC system violations no revisions or updates to present Standard Operating Procedures are planned at this time.

The findings of these studies are documented in this Report which will be posted on Western’s OASIS Web site and issued to each adjacent Balancing Authority and made available to others upon request.

2.0 PURPOSE

The purpose of this study is to examine WAPA Lower Colorado Balancing Authority (WALC) and Western’s Desert Southwest Region (DSW) transmission system performance in the 2008 -2009 winter season and to confirm the SOL for the 08-09 operating seasons.The report examines potential facility overloads as a result of N-1 and N-2 category outages. If results of studies demonstrate the need for operating procedures to be reviewed and/or developed to address Operator actions to be made to the DSW System in accordance with the applicable NERC/WECC Reliability Standards. These adjustments may include implementing a remedial action scheme (RAS) or possible generation re-dispatch within the DSW Balancing Authority.

The following NERC Reliability Standards are applicable to this study:

Standard Req. Title FAC-011 R2.2, R2.3, R5, and E1 System Operating Limits Methodology

for the Operations Horizon

TOP-002-2

R2,R3,R4,R10,R11 Normal Operations Planning

TOP-004-1

R1,R2,R6 Transmission Operations

TPL-001-0 R1.1,R1.3.2,R1.3.5-R1.3.9,R3 System Performance Under Normal Conditions

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TPL-002-0 R1.1,R1.3.1,R1.3.5-R1.3.12,R3 System Performance Following Loss of a Single BES Element

TPL-003-0 R1.1,R1.3.1,R1.3.3,R1.3.5-R1.3.12,R3

System Performance Following Loss of Two or More BES Elements

3.0 BACKGROUND

Western’s DSW transmission system is sensitive to the operations of the surrounding EHV transmission system and loadings of the Arizona – California tie lines including East-of-the-River (EOR) and West -of -the River transmission path. Western DSW participates, reviews and comments on regional studies that may impact its transmission system. Western DSW participates with the California Operating Studies Subcommittee (OSS). The OSS members include the Los Angeles Department of Water and Power, Nevada Power Company, San Diego Gas and Electric, Southern California Edison, PG&E, CAISO, Western DSW. The OSS is primarily concerned with the 500-kV transmission lines and the Pacific DC intertie limitations. Also, Western DSW is a member of the Arizona Coordinated Transmission Study Group (WATS), this group is made up of entities within the Arizona Valley and USBR, its focus is on system changes affecting transmission system performance in Arizona.

DSW Real-Time Operating Engineer conducts outage studies using base cases developed from WECC OTC studies and modified for the season and near term operating conditions. Scheduled outages and or operating problems are identified in this process and lower OTC limits are communicated to the Operators to protect the system. Also, RDRC day-ahead study results are reviewed daily and RDRC directives implemented when needed.

The DSW Real-Time Operations Engineer participates in weakly and or daily conference calls with other Operations staff from neighboring utilities during summer peak and abnormal events. Additionally, Western DSW participates in the seasonal outage coordination meetings conducted by RDRC.

Dispatcher has 30 minutes to bring a transmission element that is in an overload back to operate within NERC/WECC operating criteria.

Dispatcher has authority to shed load or open an overloaded circuit. When an overload is detected that may be a result of n-1 system condition or over scheduling of a path, the EMS SCADA system first alarms and gives annunciation that a lower set point 90-95% of SOL is reached if curtailments are not reached SCDA EMS follows with an alarm at 110% SOL this requires immediate dispatch corrective action.

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Dispatcher communicates with scheduling entity making requests for curtailment. Dispatcher has the authority to shed load. For the case of the Blythe area transmission system WALC has implemented a RAS scheme to automatically curtail generation of the Blythe generating plant for an overload condition on any of the transmission lines interconnected to the Blythe 161-kV bus

Western DSW participates in RMR studies and operates its system in a manner that does not require load shedding for single contingency conditions.

4.0 CONCLUSION

1. Because there has been no topology change to the DSW transmission system from the 07-08 summer season comprehensive study, the operating studies for the 08-09 Heavy Winter operating season are performed as case checks using the WECC operating season base case. The study performed case checks and n-1, n-2 power flow runs to ensure that safe and reliable operation of the DSW system in accordance with present operating procedures and that the nomograms are valid for the current operating season.

2. For TPL-002 category B compliance N-1, steady state N-1 power flow cases were ran. The power flow case review and assessment indicate no WALC system violations. The results of the three phase to ground fault with normal clearing runs using WECC System Performance Criteria for category B analysis also show no WALC system violations.

3. For TPL-002 category B compliance N-1, 199 steady state N-1 power flow cases were ran (comprising all of WALC”s BES lines and joint tie lines). The power flow case review and assessment indicate no WALC system violations. The results of 86 three phase to ground fault with normal clearing runs using WECC System Performance Criteria for category B analysis also show no WALC system violations. For the outage list and results

4. For TPL-003 category C compliance nine credible (same tower, common right-of-way, etc) N-2 steady state power flows and thirty N_2 with delayed clearing stability runs were made. The power flow case review and assessment as well as the stability runs indicate no WALC system violations.

5. Under system normal conditions for high or moderate power flows on the DSW transmission system, there are no violations of NERC/WEECC Standards and Criteria. There are no overloads on the DSW lines following an N-1 outages. WALC has Special Operating Procedures to mitigate overloads in the Blythe area associated with the operation of the Blythe Energy generation. Also there is the Glen Canyon unit drop procedures for use in the case of loss of a transmission element on the Glen Canyon Pinnacle Peak Transmission system.

6. The DSW annual Fault Duty analysis shows that fault duty continues to be below equipment ratings at all DSW as well as any of the surrounding substations, one bus away. There is no issue of encroachment of fault currents on the existing breaker ratings at all DSW Substations.. Recommendations have been given to Maintenance to plan for replacement of certain breakers at Pinnacle Peak and

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Glen Canyon because these breakers were getting close to the 95% fault current encroachment margin.

7. Results of studies investigating worst-case N-1 outages indicate that there is no stability problems at any IPP generating station, or at any of the federal hydro plants integrated within the WALC balancing authority. Stability was maintained for all faults studied without generator dropping or other remedial action schemes. Only in the case of a close in 3 phase fault on the Julian Hinds – Buck Blvd 230-kV line and for highly stressed EOR case unless the Blythe Energy generator reactive output is high we may observe a violation of the WECC voltage dip and dip duration criteria. In all stability runs we have observed positive rotor damping. Operating studies completed by Western validate the need for Blythe generator curtailment as shown on the Blythe Matrix.

8. Results of stability studies showed no system performance violations occurred for NERC Category B (single contingency) conditions, for three phase faults with normal (5 cycle) fault clearing time.

9. Stability Studies for NERC C stability contingencies, generator stability for several generators within the WALC foot print can be a problem. The critical NERC C stability contingencies conducted for the Glen Canyon and Griffith plants show that 1) Glen Canyon generators can become unstable for stuck breaker condition It was found that the minimum fault clearing time at Glen Canyon can be as short as 6 cycles. Also, at Griffith the minimum fault clearing time is 9 cycles.

10. Further stability studies are needed to ensure adequacy of generator protection schemes at Federal Hydro plants specifically the Glen Canyon, Hoover, Davis and Parker plants. The studies will be conducted jointly with Reclamation.

11. Under voltage conditions are observed especially with IPP generators off. Further voltage studies will be conducted to examine the need for distributed shunt capacitors and or under voltage automatic load shedding.

5.0 FINDINGS

5.1 Findings – Power Flow Analysis

5.1.1 The power flow studies conducted examined the operating performance for heavy summer and winter cases during normal and contingency conditions based on line flows and voltage profile for various operating conditions. All single and credible multiple DSW contingencies and critical contingencies for EHV tie lines in Arizona were run to determine any line overload or voltage problems. No system performance violations occurred for NERC Category B (single contingency) conditions.

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Reference is made to SOP 510 which lists continuous and emergency ratings for all DSW transmission lines and transformers.

5.1.2 With Griffith Generation off, with Davis McConnico and Griffith – Peacock in an n-2 condition will cause a voltage collapse at the Peacock 230-kV bus, Hill Top 230-kV bus 0.765 pu and Round Valley. Also, an overload on Prescott Wilowlk 123%., as shown on power flow plots . Recommended Operator action includes possible load shed: 40 mw UES load tripped at Griffith 69-kV, 33 MW UES load is tripped at Hilltop 69-kV and APS load at Hilltop.

5.1.3 Results show that the Liberty-Peacock line does not need to be derated when both its series caps are bypassed accordingly APS was requested to make a change to this effect in the "Arizona Security Manual" so that the Manual:

1. Do not derate the Liberty-Peacock 345 kV line if only the Mead 345 kV series caps are bypassed; but the Liberty 345 kV series caps are switched-in and the Liberty 230 kV PST is available.2. Do derate the Liberty-Peacock 345 kV line if either the Liberty 345 kV series caps are bypassed and/or the Liberty 230 kV PST is unavailable.

5.1.4 With high flows south on the Glen Canyon-Pinnacle Peak lines the loss of either one of the two 345/230-kV transformers causes and overload on the remaining transformer. The Operator will alleviate the overload using the Glen - Shiprock phase shifting transformer. A recommendation is made for long term solution to add a third 345/230 transformer.

5.1.5 For the following N-2 conditions reduce BEP from 520 MW to a generation level that can be sustained without going over the emergency limit of any of the lines out of Blythe.

1. For the IOS outage of Blythe – Niland 161 kV transmission line condition and a forced outage of the Blythe – Blythe SCE 161 kV line, to reduce the overload on the Blythe – Knob 161 kV transmission line reduce the BEP to a maximum of 320 MW.

2. For the IOS outage of Blythe – Blythe SCE 161 kV transmission line condition and a forced outage of the Blythe – Knob 161 kV line, to reduce the overload on the Blythe – Niland161 kV transmission line reduce the BEP to a maximum of 340 MW.

3. For the IOS outage of Blythe – Knob 161 kV transmission line condition and a forced outage of the Blythe – Blythe SCE 161 kV line, to reduce the overload on the Blythe – Niland 161 kV transmission line reduce the BEP to a maximum of 340 MW

4. For the IOS outage of Blythe – Headgate 161 kV transmission line condition and a forced outage of the Blythe – Blythe SCE 161 kV line, to reduce the overload on the Blythe – Niland 161 kV transmission line reduce the BEP to a maximum of 430 MW.

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5. For the IOS outage of Blythe – Parker 161 kV transmission line condition and a forced outage of the Blythe – Blythe SCE 161 kV line, to reduce the overload on the Blythe – Niland 161 kV transmission line reduce the BEP to a maximum of 430 MW.

6. For the IOS outage of PaloVerde – N. Gila 500 kV transmission line condition and a forced outage of the Blythe – Knob 161 kV line, to protect and reduce the overload on the Blythe – Niland 161 kV transmission line below emergency reduce the BEP to a maximum of 380 MW.

5.2 Findings - Short-Circuit Studies

The Study compared the total bus fault current at the faulted station against the station’s lowest rated breaker (in terms of its symmetrical interrupt rating). When the total bus fault current encroached on or exceeded 95% of a breaker interrupt rating, the Study judged the breaker to be inadequately sized and a candidate for replacement by the Project. Conversely, when the total bus fault current did not exceed a breaker interrupt rating, the Study judged the breaker is not a candidate for replacement.

Short-circuit studies showed the need for certain breaker replacement. Short-circuit study results are available upon request.The DSW implements a program for breaker replacements if the breaker approaches or is over the 95% margin. Fault Studies identified the following:

1. 8 circuit breakers that are underrated at Pinnacle Peak substation. The DSW Maintenance Department is proceeding with plans for replacement. G5200 will purchase two new breakers in fiscal year 2008 (3282 and 2282) and installed in the fall of fiscal year 2009. Breakers 3482 and 3682 will be purchased at the beginning of fiscal year 2009 (October 2008) to be installed in the spring (March-April 2009) of that fiscal year.

* FY2008: 3 breakers (Fall – 1. Spring = 2). * FY2009: 2 breakers (Fall - 1. Spring = 1). * FY2010: 3 breakers (Fall - 2. Spring = 1).

PPK breakers 230-kV breakers are 50-kA plan to replace margin is 47.5 kA:

Breaker 182 maximum fault current is 47.9 kA which is over the 95% margin and should be replaced. This is the breaker for transformer KU1A.

Breaker 2682 maximum fault current is 48.361 kA which is over the 95% margin and should be replaced. This is a tie breaker for the North main and transfer buses.

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Breaker 3082 maximum fault current is 48.327 kA which is over the 95% margin and should be replaced. This is the breaker for the SRP West bus connection.

Breaker 3282 maximum fault current is 48.361 kA when switch 3185 is closed. If switch 3185 is open, the maximum fault current is 48.325 kA. In either case, this breaker is over the 95% margin and should be replaced. This is the tie breaker between the South and North main buses.

Breaker 2282 maximum fault current is 47.9 kA which is over the 95% margin and should be replaced. This the breaker for transformer KU3A.

Breaker 3482 maximum fault current is 48.361 kA which is over the 95% margin and should be replaced. This is the tie breaker for the South main and transfer buses.

Breaker 3682 maximum fault current is 48.348 kA which is over the 95% margin and should be replaced. This is the breaker for the SRP East bus connection.

2. Replace the 25kV circuit breaker 4032at Glen Canyon substation. The circuit breaker is under rated. The circuit breaker was manufactured in 1986.

5.3 Findings -Transient Stability Studies

The transient stability studies focused exclusively on 3-phase bus faults on the WALC transmission system. The Study examined a bus fault on each of the substations within WALC BA. The transient stability studies simulated both normal fault clearing under NERC Category B as well as normal and delayed fault clearing under NERC Category C.

All contingencies showed damped oscillations and do not result in large changes to the voltage stability characteristics of DSW system. All single contingencies were within the 7% post-transient limit for percent voltage change. All double contingencies were well within the 10% post-transient limit for percent voltage change.

A 3-phase fault was simulated near each bus marked with an asterisk.All studies were run with PSS on -unless otherwise noted.

Appendix ?? includes transient stability plots for simulations run.. Reference is made to Voltage Stability Study Report dated ??.

The Study found that a stuck breaker condition at Glen Canyon lines simulated with delayed (15 cycle) fault clearing causes the Glen units to go out of step. Maximum clearing time was found to be 6 cycles. DSW and Reclamation are discussing accuracy of model.

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The Study used a modified version of the WECC-distributed alldyns.p EPCL program to batch-run the transient stability simulations in version 16 of the GE PSLF/PSDS software.

The Study evaluated generator stability by visually examining the plots of relative rotor angles (in degrees), terminal voltages (in per unit), generator electrical active power (in MW), generator shaft speed (in per unit), and bus frequency (in Hz). The Study evaluated transient dip and dip duration criteria by using the Worst Condition Analysis (WCA) command in the General Electric PSDS software in a batch-run program. WCA began two cycles after fault clearing.

5.4 Findings- POST-TRANSIENT VOLTAGE STABILITY STUDY

Post-transient voltage stability studies were conducted by Western DSW. Results of the simulations (see Appendix E) show that under normal conditions DSW Transmission System meets the voltage stability/reactive power margin criteria of WECC Reliability Criteria, all of the credible contingency cases show a positive margin at the DSW buses examined.

6.0 STUDY ASSUMPTIONS

6.1 Power flow studies used version 16.0 of General Electric’s PSLF/PSDS software. Studies follow DSW Planning Methodology, May 2007

6.2 In this Report the DSW high voltage transmission system and interconnected transmission system is examined during the period represented in the WECC year 2008- 2009, heavy winter and several scenario base cases are examined. This report includes a contingency analysis of the high voltage system in the study area

6.3 In evaluating the power flows only DSW facilities in the state of Arizona, as represented in the study cases, are reported to cause a constrain and operator action. Handling of the non-DSW power flow limits are left to each of the respective local utilities, through their normal planning processes.

6.4 WALC has implemented a RAS scheme to automatically curtail generation of the Blythe generating plant for an overload condition on any of the transmission lines interconnected to the Blythe 161-kV bus. Western’s Blythe area automated RAS scheme is considered as implemented, this means that BEP I generation is curtailed for power flows above 100 % after 20 minutes on any of the five 161-kV lines connected at Blythe.

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6.5 Dispatcher has 30 minutes to bring a transmission element that is in an overload back to operate within NERC/WECC operating criteria.

6.6 Dispatcher has authority to shed load or open an overloaded circuit. When an overload is detected that may be a result of n-1 system condition or over scheduling of a path, the EMS SCADA system first alarms and gives annunciation that a lower set point 90-95% of SOL is reached if ace curtailments are not reached SCDA EMS follows with an alarm at 110% SOL this requires immediate dispatch corrective action.

7. METHODOLOGY

WALC performs operating studies to assess the performance of the its system consistent with the following:

7.1 These studies are performed for annually next operating season using WALC’s Standard Operating Procedures (SOPs), Facility Rating Methodology, WALC SOL Methodology, and the WECC Base Case Data Preparation Manual in accordance NERC requirements, for TPL-001.

7.2 Studies conducted in compliance with NERC TPL-001 (with all transmission facilities in service and with normal (pre-contingency) operating procedures in effect.

7.3 Studies conducted in compliance with NERC TPL-002 (under the contingency conditions as defined in Category B of Table I.

7.4 Studies conducted in compliance with NERC TPL-3 (under the contingency conditions as defined in Category C of Table I).

7.5 The operating studies use the approved season WECC operating base cases. Sensitivity cases are prepared to cover WALC’s a range of demand levels (peak and off peak load conditions).

7.6 Western’s DSW WALC Facility Ratings Methodology is consistent with the following: A Facility Rating Shall equal the most limiting applicable Equipment rating of the individual equipment that comprises that facility.

7.7 The following is Western DSW’s IROL criteria when performing operating studies:7.7.1 If system conditions are found where the base cases do not solve, which may

indicate voltage instability, or during transient analysis finding conditions that are system unstable or plant unstable then DSW will either not allow Operation of the system in these conditions or develop a mitigation plan that alleviates any system overloads or stability concerns that will allow Operation at that system studied point.

7.7.2 Other path flows and area load / generation will be adjusted as needed but, within the parameters of the season, to allow maximizing the system ATC.

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7.7.3 In the pre-contingency state and with all Facilities in service, the Bulk Electric System (BES) shall demonstrate transient, dynamic and voltage stability, and Facility Ratings shall not be exceeded, and uncontrolled separation shall not occur.

7.7.4 Following the contingencies identified in the Contingencies sections below, the system shall demonstrate transient, dynamic and voltage stability, and Facility Ratings shall not be exceeded, and uncontrolled separation shall not occur.

7.7.5 In general, a 10% emergency overload rating for the DSW Transmission System lines and transformers is allowed for N-1 contingencies. Certain exceptions are identified such as not to exceed the continuous rating of phase shifting transformers at Liberty and Glen Canyon.

7.7.6 For voltage and reactive adequacy, Western DSW will not operate below 0.90 per unit voltage on its transmission system but attempts to maintain between 0.95 and 1.05 per unit voltage. Western DSW goal is to maintain, at a minimum, net zero reactive flow or to export reactive power slightly on all tie- lines.

7.7.7 DSW Q-V curves are determined by modeling a synchronous condenser at a major receiving station bus (the critical bus in the study area). Following the outage of a critical system element (e.g. major transformer, generator, transmission line, reactive power source, etc.), the reactive power output of this synchronous condenser is plotted as a function of its scheduled voltage by varying the scheduled voltage in increments and solving the power flow case to determine the reactive power reserve or deficit at the critical bus in the study area. . In conjunction with Q-V, WALC/DSW also uses P-V method according to NERC/WECC standards for voltage stability analysis. DSW also plots P-V (Power versus Voltage) curves. These curves are developed by varying the power import into an area.

7.7.8 The hydro and thermal generation and loads in the Arizona area will be adjusted to represent expected summer conditions.

7.7.9 Sensitivity studies will be done to address variations in DSW load level.7.7.10 Study methodology presently adhered to by OSS and WATS will be observed in

the conduction of these studies.

8. Previous Seasonal Limits

Season EOR (Path 49) OTC WOR (Path 46) OTCSummer 07 8055 MWWinter 07/08 W-E W-E

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8. BASE CASES

In this report the DSW high voltage transmission system and interconnected transmission system is examined during the period represented in the WECC year 2008-9 Heavy Winter Base Case (09hlw1A and 09HW2A).

Westerns project use loads in area 14, will be per winter peak CROD. Westerns embedded system loads and transmission commitments at maximum.

WALC hydro power will be at high, IPP’s in WALC control area will be at maximum output. The increased generation will be scheduled to Area 24 (SC). Area 24 generation scaled down as necessary.

Western’s Blythe area automated RAS scheme is implemented, this means that BEP I generation is curtailed for power flows above 100 % after 20 minutes on any of the five 161-kV lines connected at Blythe. The Report includes a contingency analysis of the high voltage system in the study area. Pre-contingency and Post – contingency bus voltages less than or greater, or equal to the listed criteria are monitored and recorded for each case run. The report highlights all criteria violations.

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9. OPERATING NOMOGRAMSS

1- MEADOPERATING NOMOGRAMS

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Mead-Phoenix / Harry Allen-Mead Nomogram

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Harry Allen-Mead 500 kV line flow (MW)

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(MW

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Mead-Phoenix / Harry Allen-Mead NomogramNo KT2A Transformer

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Mead-Phoenix / Harry Allen-Mead Nomogram

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Mead-Phoenix / Harry Allen-Mead NomogramNo KT2A Transformer

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2- BLYTHE AREAOPERATING NOMOGRAM

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-50 0 50 100 150 200 250

TOTAL FLOW: Blythe-Niland, Knob-Pilot Knob Path 9

BLY

T HE

GE N

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Critical Contingency: Blythe – Blythe SCE 161kV lineOverloads on the Blythe – Niland 161kV “F” Line

300 350

NO Blythe GenCurtailments

Blythe Gen Curtailments Required

Blythe Gen Curtailments Required for possible overloads on the Blythe-Eagle Mountain 161kV line.

IID – WAPA L.C. – Path 9Nomogram w/Blythe


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12/4/2007

Blythe – Knob IOSNomogram w/Blythe

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-50 0 50 100 150 200 250TOTAL FLOW: Blythe – Niland and Knob-Pilot Knob Path 9

BLYT

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300 350

Max BEP Generation = 340MW Total Net

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Niland-Coachella IOSNomogram w/Blythe

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TOTAL FLOW: Blythe – Niland and Knob-Pilot Knob Path 9

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Critical Contingency: Niland – El Centro 161kV lineOverloads on the Niland 161/92kV transformer

300 350



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Niland-El Centro IOSNomogram w/Blythe

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Critical Contingency: Niland – Coachella Valley 161kV lineOverloads on the Niland 161/92kV transformer

300 350



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Blythe – Headgate IOSNomogram w/Blythe

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Blythe – Parker IOSNomogram w/Blythe

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Palo Verde – N. Gila IOSNomogram w/Blythe

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Critical Contingency: Blythe – Knob 161kV lineOverloads on the Blythe – Niland 161kV “F” Line

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Path 59 - Eagle Mt. 230/161 kV Blythe 161 kV Tie

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Path 59 - Eagle Mt. 230/161 kV Blythe 161 kV Tie

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Blythe (SCE) 161 kV bus load (MW

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Gila to IID 161kV:Steady-State Power Flow Nomograms

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North Gila-Imperial Valley 500 kV

GILA 69/161-kV

GILA-KNOB 161kV

KNOB-PILOT KNOB 161kV

Nomogram for flow limited by continuous ratings of local circuits for critical N-1 (NGL-IV500kV line)

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.

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North Gila – Imperial Valley 500-kV

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NORTH GILA 500/69-kV

GILA 69/161-kV

GILA-KNOB 161kV

KNOB-PILOT KNOB 161kV

PILOT KNOB-EL CENTRO 161kV

PILOT KNOB 161/92-kV

ELCENTRO 161/92-kV

BLYTHE-NILAND 161kV

YUCCA 69/161-kV

YUCCA-PILOT KNOB 161kV

GILA-WELLTON MOHAWK 161kV

DOME TAP-GILA 161kV

KOFA-DOME TAP 161kV

Nomogram for case PRE0 with steady-state power flow limited by continuous ratings of local circuits for critical N-1 (NGL-IV500kV line)

.

.


7

Appendix D

Stability Plots

Available Upon Request

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Appendix E

Buck Blvd Generation Curtailment Matrix (Blythe Matrix)

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WALC Operations Study Plan

Appendix A

Study PlanFor

DSW System Operating Study

2008-2009 WINTER STUDY PLAN

April 2, 2008

Prepared by

Nick SaberReal-Time Operating Engineer

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1. Introduction

Western’s Desert Southwest (DSW) Operating Study is in support of WECC’s effort to adequately study the performance of its Transmission System to ensure acceptable and reliable operation. Any WECC/NERC Criteria violations observed are documented and DSW informs the effected Arizona and California entity of potential violations. DSW participates in OSS meetings with DSW California transmission owners (Southern California Edison, San Diego Gas & Electric, Los Angeles Department of Water and Power, Imperial Irrigation District), California ISO, and the Arizona transmission owners and operators (Salt River Project, Arizona Public Services) work together to ensure that the paths encompassed within the EOR/SCIT nomogram meet the WECC reliability criteria. Also DSW participates with other Arizona entities in WATS meetings.

The Operating Study is intended to identify for the system operators the transmission system potential impacts observed in the current season WECC approved Operating Base case on Western’s Desert Southwest (DSW) transmission system, and how they are dealt with. The study will address if it is feasible to operate the DSW Transmission System in the coming season and if generation re-dispatch will become necessary to meet operating criteria and validate adequacy of existing remedial action schemes (RAS).

The following NERC Reliability Standards are applicable to this study:

Standard Req. Title

FAC-011 R2.2, R2.3, R5, and E1

System Operating Limits Methodology for the Operations Horizon

FAC-014 R2 Establish and Communicate System Operating Limits

TOP-002-2 R2,R3,R4,R10,R11

Normal Operations Planning

TOP-004-1 R1,R2,R6 Transmission Operations

2. Background /Transmission System Description:

The DSW Transmission System is represented on power flow diagrams.

Western’s transmission lines were constructed in support of the following federal projects: Boulder Canyon-57 miles, 230-kV; Colorado River Storage Project-227 miles 345-kV from Phoenix to Glen Canyon; Parker-Davis Project-700 miles 230-kV; Intertie Power System-238 miles 345-kV between Liberty and Mead and 41 miles 230-kV from Liberty to Westwing. The DSW transmission system includes 370 miles 161-kV south of Parker Dam connecting the Parker Hydro Powerplant to the Blythe and Wellton, Gila and Knob areas. The transmission system was built on wood H-frame structures. 954 MCM ACSR conductor for the Parker-Blythe 161-kV transmission line; 477 MCM ACSR conductor for the Parker-Headgate 161-kV transmission line and 300 MCM Copper conductor for the 161-kV transmission loop between Parker, Kofa, Dome Tap, and Gila.

The DSW transmission system is interconnected with IID at Blythe and Knob Substations. There is a 161-kV line from Blythe to Eagle Mt., which is owned by SCE. The Iron Mt.-Eagle Mt 230-kV and the Eagle

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Mt.-J. Hinds 230-kV lines are owned by the Metropolitan Water District of Southern California (MWD). The existing 161-kV lines south of Parker are rated at between 100 MVA and 200 MVA.

The Kingman-Havasu Transmission Line Project, which includes a 230-kV line between the existing Hilltop Substation and a new substation called North Havasu, would interconnect to the existing Parker-Davis #1 line approximately 10 miles north of the existing Black Mesa Substation.

The Topock Project, which includes a 230-kV/69-kV substation, would interconnect to the existing Parker-Davis #1 line approximately 25 miles south of the existing Davis Substation. The Griffith Project includes a 520-MW 3-unit generating station near the existing McConnico Substation.

The Griffith Project includes the following transmission facilities:

an 8-mile 230-kV line between the Griffith Project and the existing McConnico Substation.

a tap substation “Peacock” at a site 85 miles south of the Mead Substation, which

connects with the Liberty-Mead 345-kV transmission line. Connect Peacock Substation to the existing Hilltop Substation with 17-mile 230-kV transmission line and to the McConnico Substation with 30 mile of new 230-kV line.

Western’s transmission line ratings can be found in SOP 510.

3. Significant Scheduling Paths:

The following scheduling paths are of significant importance to this study: EOR, West of the River (WOR), and Four Corners West. All of these lines are monitored on the power flow diagrams. All of the transmission lines mentioned below are represented on the WSCC interconnected system map.

EAST OF THE RIVER (EOR)The path, which connects western Arizona with southern California, consists of the following transmission lines:

Navajo-McCullough 500-kV

Moenkopi-El Dorado 500-kVLiberty -Mead 345-kVPalo Verde-Devers-500-kVPalo Verde-North Gila 500-kVMead-Phoenix 500-kV (scheduled to be completed in late 1995)This path is rated at 7000-MW east to west.

WEST OF THE RIVER (WOR)The path, which connects western Arizona with southern California, consists of the following transmission lines:

McCullough-Victorville 500-kV circuit #1McCullough-Victorville 500-kV circuit #2McCullough-#2-Adelanto 500-kVMead DWP-Victorville 287-kVMojave-Lugo 500-kV

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Eldorado-Lugo 500-kVEldorado-Lugo 230-kV circuit #1Eldorado-Lugo 500-kV circuit #2

N. Gila – Imperial V. 500-kVPaloVerde-Devers 500-kVMirage-Cochlea V. 230 circuit #1Mirage-Cochlea V. 230 circuit #2Imperial V. - El Centro 230-kVJ. Hinds-Devers 230-kV

West of Four CornersThis path, which connects the Four Corners area with central Arizona, consists of the following transmission lines:

Four Corners-Moenkopi 500-kVFour Corners-Cholla 345-kV #1Four Corners-Cholla 345-kV #2

The present rating for this path is 2300-MW east to west.

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4. Methodology

WALC will continue performing study work to establish reliable SOL for based on Arizona limitations during critical equipment outage conditions within the DSW transmission system.

WALC study plans and study reports are disseminated via e-mail and web-posting. OSS meetings are posted on WECC website and are open to all stakeholders. Any documented technical comments on the study methodology are discussed at the WATS and or OSS meetings and appropriate revisions to the methodology or responses to the comments are in compliance with requirement R5 of FAC-011-1.

DSW requires use of a study methodology and criteria consistent with the following:

1. In the pre-contingency state and with all Facilities in service, the Bulk Electric System (BES) shall demonstrate transient, dynamic and voltage stability, and Facility Ratings shall not be exceeded, and uncontrolled separation shall not occur.

2. Following the single and double contingencies identified in the Contingencies sections below, the system shall demonstrate transient, dynamic and voltage stability, and Facility Ratings shall not be exceeded, and uncontrolled separation shall not occur.

3. The single contingencies identified in the Contingencies section will meet requirements R2.2 and R2.3 of FAC-011-1.

4. The double contingencies identified in the Contingencies section met and exceed the requirements Regional Difference E1 of FAC-011-1.

5.1. Base CasesThe base case will start from the 2008-2009 Heavy Winter case developed by WECC with additional comments from the subregional study groups to more accurately reflect the expected load and generation patterns for the study period. SCIT will be stressed until the WECC reliability requirements are not satisfied. IPPDC will be stressed to its maximum transfer of 1,920 MW. PDCI will be stressed to its maximum rating of 3,100 MW Path 26 will be stressed to its maximum OTC rating of 4,000 MW. North of Lugo path will be stressed up to 1,200 MW. West of River (WOR) flow will maintain a delta flow of 400 MW to 2,000 MW

with respect to the EOR flow and vary to increase total SCIT OTC.

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5.2. Study Process

5.2.1. Path Interaction

Path Interaction East of River path flow will be stressed to 8055 MW flow. This case will be used

to check the validity of loadings on the DSW facilities at its SOL level. .

5.2.2. Operating Reserve

Evaluate minimum operating reserve levels in WAL BA.

5.2.3 Contingencies

N-1 Sensitivity cases:

Run the following critical N-1 cases:

Hassayampa - North Gila 500 kV Palo Verde - Devers 500 kV Run outage for each line connected to the Blythe Substation use Blythe RAS to mitigate

any overload North Gila – Imperial Valley 500 kV line with IID protection scheme on El Centro

230/161 kV transformer IV – Miguel 500 kV Line Outage with RAS (trip IV generation and cross trip IV – La

Rosita 230 kV line if tripping IV generation only is insufficient to relieve the overload on CFE 230 kV lines)

Develop the following N-1 outage list of cases for use as a benchmark for the N-2 series of outages

N-2:

Conduct N-2 contingency analysis for the following combination of two line outages:

230 kV Transmission line from HASSYAMP to LIBERTY and 230 kV Transmission line from line from GILABEND to LIBERTY

230 kV Transmission line from line from ROGERS to PINPK and 230 kV Transmission line from line from ROGERS 230.00 PINPK

230 kV Transmission line from line from DAVIS to TOPOCK and 230 kV Transmission line from line from DAVIS to TOPOCK

230 kV Transmission line from line from LIBERTY to WESTWING and 230 kV Transmission line from line from LIBERTY to ORME

230 kV Transmission line from line from LIBERTY to COOLIDGE and

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230 kV Transmission line from line from LIBERTY to PHXWAPA

345 kV Transmission line from line from FLAGSTAF to GLENCANY and 345 kV Transmission line from line from FLAGSTAF to GLENCANY

345 kV Transmission line from line from FLAGSTAF to PINPKBRB and 345 kV Transmission line from line from FLAGSTAF to PINPKBRB?

Palo Verde - Westwing #1 500 kV & Palo Verde – Westwing #2 500 kV McCullough – Victorville #1 500 kV & McCullough – Victorville #2 500 kV

G-2: (tested for positive margin only at nomogram and / or OTC points) Loss of 2 Palo Verde Units

o Palo Verde RAS scheme to trip load at SRP and APS Loss of 2 Diablo Canyon Units Loss of 2 SONGS Units

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N-1 Outage List

No Contingency ,0

19182,"BUK-TAP 69.00", 84811,"BUCKSKIN 69.00" ck=1 ,1

14201,"BUCKEYE 230.00", 19052,"LIBERTY 230.00" ck=1 ,2

14213,"BUCKEYE2 230.00", 19052,"LIBERTY 230.00" ck=1 ,3

14209,"EAGLEYE 230.00", 14213,"BUCKEYE2 230.00" ck=1 ,4

14221,"PNPKAPS 230.00", 19062,"PPKWAPA 230.00" ck=1 ,5

14226,"SNTAROSA 230.00", 19068,"TESTTRAK 230.00" ck=1 ,6

14250,"WILOWLKW 230.00", 14222,"PRESCOTT 230.00" ck=1 ,7

14258,"TS4 230.00", 19052,"LIBERTY 230.00" ck=1 ,8

14356,"SAG.EAST 115.00", 19057,"ORACLE 115.00" ck=1 ,9

14357,"SAG.WEST 115.00", 19069,"ED-5B 115.00" ck=1 ,10

14359,"VLYFARMS 115.00", 19057,"ORACLE 115.00" ck=1 ,11

15103,"BONNEYTP 115.00", 19044,"COOLIDGE 115.00" ck=1 ,12

46-76


15181,"SNYDHLAZ 115.00", 19214,"SNYDHILL 115.00" ck=1 ,13

15212,"ROGERS 230.00", 19502,"ROGSWAPA 230.00" ck=1 ,14

15212,"ROGERS 230.00", 19502,"ROGSWAPA 230.00" ck=2 ,15

17013,"MARANATP 115.00", 19210,"RATTLSNK 115.00" ck=1 ,16

18003,"AMARGOSA 230.00", 18006,"HENDRSON 230.00" ck=1 ,17

18005,"BASIC 230.00", 18006,"HENDRSON 230.00" ck=1 ,18


18006,"HENDRSON 230.00", 19011,"MEAD N 230.00" ck=1 ,20

18010,"CLARK E 230.00", 18006,"HENDRSON 230.00" ck=1 ,21

18011,"CLARK W 230.00", 18006,"HENDRSON 230.00" ck=1 ,22

18055,"BC TAP 230.00", 18003,"AMARGOSA 230.00" ck=1 ,23

18055,"BC TAP 230.00", 18007,"BC TAPNV 230.00" ck=1 ,24

18055,"BC TAP 230.00", 19011,"MEAD N 230.00" ck=1 ,25

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19011,"MEAD N 230.00", 18015,"DECATUR 230.00" ck=1 ,26

19011,"MEAD N 230.00", 18016,"EASTSIDE 230.00" ck=1 ,27

19011,"MEAD N 230.00", 18021,"NEWPORT 230.00" ck=1 ,28

19011,"MEAD N 230.00", 18600,"EQUEST 230.00" ck=2 ,29

19011,"MEAD N 230.00", 19043,"HVRA3A4 230.00" ck=1 ,30

19012,"MEAD S 230.00", 18023,"PAHRUMP 230.00" ck=1 ,31

19012,"MEAD S 230.00", 18600,"EQUEST 230.00" ck=1 ,32

19012,"MEAD S 230.00", 18674,"GREENWAY 230.00" ck=1 ,33

19012,"MEAD S 230.00", 19011,"MEAD N 230.00" ck=1 ,34

19012,"MEAD S 230.00", 24041,"ELDORDO 230.00" ck=1 ,35

19012,"MEAD S 230.00", 24041,"ELDORDO 230.00" ck=2 ,36

19012,"MEAD S 230.00", 26046,"MCCULLGH 230.00" ck=1 ,37

19012,"MEAD S 230.00", 26046,"MCCULLGH 230.00" ck=2 ,38

48-76


19020,"BLYTHE 161.00", 19101,"BUCKBLVD 161.00" ck=1 ,39

19020,"BLYTHE 161.00", 19105,"GLT TAP 161.00" ck=1 ,40

19020,"BLYTHE 161.00", 19206,"HEADGATE 161.00" ck=1 ,41

19020,"BLYTHE 161.00", 21047,"NILAND 161.00" ck=1 ,42

19020,"BLYTHE 161.00", 24017,"BLYTHESC 161.00" ck=1 ,43

19022,"DAVIS 230.00", 19011,"MEAD N 230.00" ck=1 ,44

19022,"DAVIS 230.00", 19320,"TOPOCK 230.00" ck=1 ,45

19022,"DAVIS 230.00", 19320,"TOPOCK 230.00" ck=2 ,46

19022,"DAVIS 230.00", 26046,"MCCULLGH 230.00" ck=1 ,47

19029,"HOVRA5A6 230.00", 19012,"MEAD S 230.00" ck=1 ,48

19030,"HOVRA7-9 230.00", 19012,"MEAD S 230.00" ck=1 ,49

19038,"MEAD 500.00", 15034,"PERKINS 500.00" ck=1 ,50

19038,"MEAD 500.00", 26044,"MARKETPL 500.00" ck=1 ,51

49-76


19041,"PARKERAZ 161.00", 19020,"BLYTHE 161.00" ck=1 ,52

19041,"PARKERAZ 161.00", 19046,"BOUSE 161.00" ck=1 ,53

19041,"PARKERAZ 161.00", 19206,"HEADGATE 161.00" ck=1 ,54

19042,"PARKER 230.00", 14209,"EAGLEYE 230.00" ck=1 ,55

19042,"PARKER 230.00", 19019,"BLK MESA 230.00" ck=1 ,56

19042,"PARKER 230.00", 19075,"HAVASU 230.00" ck=1 ,57

19042,"PARKER 230.00", 19204,"HARCUVAR 230.00" ck=1 ,58

19042,"PARKER 230.00", 25402,"GENE 230.00" ck=1 ,59

19044,"COOLIDGE 115.00", 14359,"VLYFARMS 115.00" ck=1 ,60

19044,"COOLIDGE 115.00", 19065,"ED-2 115.00" ck=1 ,61

19044,"COOLIDGE 115.00", 19066,"SIGNAL 115.00" ck=1 ,62

19045,"COOLIDGE 230.00", 19410,"SUNDANCE 230.00" ck=1 ,63

19045,"COOLIDGE 230.00", 19410,"SUNDANCE 230.00" ck=2 ,64

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19047,"DEL BAC 115.00", 19221,"NGL-WALC 115.00" ck=1 ,65

19050,"GILA YU 161.00", 19051,"KNOB 161.00" ck=1 ,66

19050,"GILA YU 161.00", 19070,"DOME TAP 161.00" ck=1 ,67

19051,"KNOB 161.00", 21059,"PILOTKNB 161.00" ck=1 ,68

19052,"LIBERTY 230.00", 14231,"WESTWNGW 230.00" ck=1 ,69

19053,"LIBERTY 345.00", 19315,"PEACOCK 345.00" ck=1 ,70

19056,"MCCONICO 230.00", 19022,"DAVIS 230.00" ck=1 ,71

19056,"MCCONICO 230.00", 19310,"GRIFFITH 230.00" ck=1 ,72

19057,"ORACLE 115.00", 17608,"S.BRKRCH 115.00" ck=1 ,73

19062,"PPKWAPA 230.00", 15211,"PINPKSRP 230.00" ck=1 ,74

19062,"PPKWAPA 230.00", 15211,"PINPKSRP 230.00" ck=2 ,75

19063,"WLTNMOHK 161.00", 19050,"GILA YU 161.00" ck=1 ,76

19064,"TUCSON 115.00", 19047,"DEL BAC 115.00" ck=1 ,77

51-76


19064,"TUCSON 115.00", 19057,"ORACLE 115.00" ck=1 ,78

19065,"ED-2 115.00", 19071,"ED-4 115.00" ck=1 ,79

19065,"ED-2 115.00", 19202,"BRADY 115.00" ck=1 ,80

19068,"TESTTRAK 230.00", 19218,"CASAGRND 230.00" ck=1 ,81

19069,"ED-5B 115.00", 19048,"EMPIRE 115.00" ck=1 ,82

19072,"HILLTOP 230.00", 19056,"MCCONICO 230.00" ck=1 ,83

19074,"N.HAVASU 230.00", 19042,"PARKER 230.00" ck=1 ,84

19079,"HOVRN7N8 230.00", 19012,"MEAD S 230.00" ck=1 ,85

19080,"HOVRN5N6 230.00", 19012,"MEAD S 230.00" ck=1 ,86

19081,"HOVRN3N4 230.00", 19012,"MEAD S 230.00" ck=1 ,87

19082,"HOVRN1N2 230.00", 19012,"MEAD S 230.00" ck=1 ,88

19083,"HOVRA1A2 230.00", 19012,"MEAD S 230.00" ck=1 ,89

19105,"GLT TAP 161.00", 19051,"KNOB 161.00" ck=1 ,90

52-76


19106,"PRSCOTWA 230.00", 14222,"PRESCOTT 230.00" ck=1 ,91

19106,"PRSCOTWA 230.00", 19501,"RNDVLYTP 230.00" ck=1 ,92

19107,"GAVLINWA 230.00", 14243,"GAVILNPK 230.00" ck=1 ,93

19107,"GAVLINWA 230.00", 19062,"PPKWAPA 230.00" ck=1 ,94

19107,"GAVLINWA 230.00", 19106,"PRSCOTWA 230.00" ck=1 ,95

19201,"BLACKMTN 115.00", 15182,"BLKMTNAZ 115.00" ck=1 ,96

19203,"BRAWLEY 115.00", 15179,"BRAWLYAZ 115.00" ck=1 ,97

19203,"BRAWLEY 115.00", 19213,"SANXAVER 115.00" ck=1 ,98

19204,"HARCUVAR 230.00", 19500,"HASSYTAP 230.00" ck=1 ,99

19209,"PICACHOW 115.00", 19211,"RED ROCK 115.00" ck=1 ,100

19210,"RATTLSNK 115.00", 19064,"TUCSON 115.00" ck=1 ,101

19210,"RATTLSNK 115.00", 19216,"TWINPEAK 115.00" ck=1 ,102

19211,"RED ROCK 115.00", 14356,"SAG.EAST 115.00" ck=1 ,103

53-76


19212,"SANDARIO 115.00", 15178,"SANDARAZ 115.00" ck=1 ,104

19212,"SANDARIO 115.00", 19203,"BRAWLEY 115.00" ck=1 ,105

19213,"SANXAVER 115.00", 15180,"SANXAVAZ 115.00" ck=1 ,106

19213,"SANXAVER 115.00", 19214,"SNYDHILL 115.00" ck=1 ,107

19215,"SPOOKHIL 230.00", 19045,"COOLIDGE 230.00" ck=1 ,108

19216,"TWINPEAK 115.00", 15177,"TWINPKAZ 115.00" ck=1 ,109

19216,"TWINPEAK 115.00", 19212,"SANDARIO 115.00" ck=1 ,110

19310,"GRIFFITH 230.00", 19314,"PEACOCK 230.00" ck=1 ,111

19314,"PEACOCK 230.00", 19072,"HILLTOP 230.00" ck=1 ,112

19315,"PEACOCK 345.00", 19037,"MEAD 345.00" ck=1 ,113

19320,"TOPOCK 230.00", 19019,"BLK MESA 230.00" ck=1 ,114

19320,"TOPOCK 230.00", 19316,"SOPOINT 230.00" ck=1 ,115

19320,"TOPOCK 230.00", 19316,"SOPOINT 230.00" ck=2 ,116

54-76


19500,"HASSYTAP 230.00", 15173,"HASSY AZ 230.00" ck=1 ,117

19500,"HASSYTAP 230.00", 19052,"LIBERTY 230.00" ck=1 ,118

19501,"RNDVLYTP 230.00", 14223,"ROUNDVLY 230.00" ck=1 ,119

19501,"RNDVLYTP 230.00", 19314,"PEACOCK 230.00" ck=1 ,120

19502,"ROGSWAPA 230.00", 19062,"PPKWAPA 230.00" ck=1 ,121

19502,"ROGSWAPA 230.00", 19062,"PPKWAPA 230.00" ck=2 ,122

19502,"ROGSWAPA 230.00", 19215,"SPOOKHIL 230.00" ck=1 ,123

24019,"CAMINO 230.00", 19012,"MEAD S 230.00" ck=E ,124

24019,"CAMINO 230.00", 19012,"MEAD S 230.00" ck=W ,125

79024,"FLAGSTAF 345.00", 79032,"GLENCANY 345.00" ck=1 ,127

79024,"FLAGSTAF 345.00", 79032,"GLENCANY 345.00" ck=2 ,128

79024,"FLAGSTAF 345.00", 79053,"PPK WAPA 345.00" ck=1 ,129

79024,"FLAGSTAF 345.00", 79053,"PPK WAPA 345.00" ck=2 ,130

55-76


79027,"GALLEGOS 115.00", 79098,"BERGIN 115.00" ck=1 ,131

79028,"GLEN PS 230.00", 79093,"NAVAJO 230.00" ck=1 ,132

79043,"KAYENTA 230.00", 79063,"SHIPROCK 230.00" ck=1 ,133

79043,"KAYENTA 230.00", 79096,"LNGHOUSE 230.00" ck=1 ,134

79062,"SHIPROCK 115.00", 79101,"FRUITAP 115.00" ck=1 ,135

79062,"SHIPROCK 115.00", 79112,"MESA FM 115.00" ck=1 ,136

79064,"SHIPROCK 345.00", 10292,"SAN_JUAN 345.00" ck=1 ,137

79064,"SHIPROCK 345.00", 14101,"FOURCORN 345.00" ck=1 ,138

19062,"PPKWAPA 230.00", 14231,"WESTWNGW 230.00" ck=1 ,152

19052,"LIBERTY 230.00", 19225,"LONEBUTT 230.00" ck=1 ,153

19225,"LONEBUTT 230.00", 19068,"TESTTRAK 230.00" ck=1 ,154

19225,"LONEBUTT 230.00", 19410,"SUNDANCE 230.00" ck=1 ,157

19022,"DAVIS 230.00", 17019,"RIVIERA 230.00" ck=1 ,159

56-76


19012,"MEAD S 230.00", 19011,"MEAD N 230.00" ck=2 ,160

19020,"BLYTHE 161.00", 14302,"BLYTHEAZ 161.00" ck=1 ,161

19044,"COOLIDGE 115.00", 19000,"COL-SCIP 115.00" ck=1 ,163

19046,"BOUSE 161.00", 14301,"BLACK PK 161.00" ck=1 ,164

19046,"BOUSE 161.00", 19400,"KOFA 161.00" ck=1 ,165

19051,"KNOB 161.00", 19189,"DESALTER 161.00" ck=1 ,166

19052,"LIBERTY 230.00", 15230,"RUDD 230.00" ck=1 ,167

19056,"MCCONICO 230.00", 50,"HARRIS 230.00" ck=1 ,168

19066,"SIGNAL 115.00", 19065,"ED-2 115.00" ck=1 ,169

19070,"DOME TAP 161.00", 19063,"WLTNMOHK 161.00" ck=1 ,170

19071,"ED-4 115.00", 14360,"ELOY 115.00" ck=1 ,171

19182,"BUK-TAP 69.00", 19183,"CLO-TAP 69.00" ck=1 ,172

19183,"CLO-TAP 69.00", 84812,"COLORADO 69.00" ck=1 ,173

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19209,"PICACHOW 115.00", 19202,"BRADY 115.00" ck=1 ,174

19214,"SNYDHILL 115.00", 19201,"BLACKMTN 115.00" ck=1 ,175

19217,"TESTTRAK 69.00", 84855,"MARICOPA 69.00" ck=1 ,176

19222,"CASAGRND 115.00", 19048,"EMPIRE 115.00" ck=1 ,177

19304,"HEADGATE 69.00", 84810,"BLACKSW2 69.00" ck=1 ,183

19320,"TOPOCK 230.00", 19074,"N.HAVASU 230.00" ck=1 ,184

19400,"KOFA 161.00", 19070,"DOME TAP 161.00" ck=1 ,185

19720,"WST-WALC 69.00", 17744,"WARMSPRG 69.00" ck=1 ,186

19720,"WST-WALC 69.00", 19721,"DUV-WALC 69.00" ck=1 ,187

19721,"DUV-WALC 69.00", 17706,"DUVAL 69.00" ck=1 ,188

19721,"DUV-WALC 69.00", 17710,"KINGMANT 69.00" ck=1 ,189

79028,"GLEN PS 230.00", 79031,"GLENCANY 230.00" ck=2 ,190

14246,"RACEWAY 230.00", 19115,"RACEWYWA 230.00" ck=1 ,191

58-76


14350,"ADAMS 115.00", 19060,"ADAMSTAP 115.00" ck=1 ,192

14357,"SAG.WEST 115.00", 19097,"ED-5 115.00" ck=1 ,193


19017,"PARKERAZ 69.00", 19183,"CLO-TAP 69.00" ck=1 ,195

19018,"PLANETTP 69.00", 19182,"BUK-TAP 69.00" ck=1 ,196

19018,"PLANETTP 69.00", 84816,"MOHAVECP 69.00" ck=1 ,197

19018,"PLANETTP 69.00", 84818,"PLANET 69.00" ck=1 ,198

19049,"GILA 69.00", 84895,"AR FH TP 69.00" ck=1 ,199

19052,"LIBERTY 230.00", 19061,"PHX WAPA 230.00" ck=1 ,200

19058,"LIBTYPS 230.00", 19052,"LIBERTY 230.00" ck=2 ,201

19060,"ADAMSTAP 115.00", 17001,"APACHE 115.00" ck=1 ,202

19060,"ADAMSTAP 115.00", 19221,"NGL-WALC 115.00" ck=1 ,203

19061,"PHX WAPA 230.00", 19225,"LONEBUTT 230.00" ck=1 ,204

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19097,"ED-5 115.00", 19071,"ED-4 115.00" ck=1 ,205

19115,"RACEWYWA 230.00", 14259,"WESTWNGE 230.00" ck=r1,206

19202,"BRADY 115.00", 15174,"BRADYAZ 115.00" ck=1 ,207

19208,"N.WADDEL 230.00", 19115,"RACEWYWA 230.00" ck=r1,208

19209,"PICACHOW 115.00", 15175,"PICACHAZ 115.00" ck=1 ,209

19211,"RED ROCK 115.00", 15176,"REDRCKAZ 115.00" ck=1 ,210

19229,"SONORA 69.00", 19049,"GILA 69.00" ck=1 ,211

19428,"YPGTAP 69.00", 19429,"SENTWASH 69.00" ck=1 ,213

19448,"DAVIS 69.00", 19722,"BUL-WALC 69.00" ck=1 ,214

19722,"BUL-WALC 69.00", 17404,"BULLHEAD 69.00" ck=1 ,215

19722,"BUL-WALC 69.00", 19720,"WST-WALC 69.00" ck=1 ,216

84836,"N.GILA 69.00", 19049,"GILA 69.00" ck=1 ,217

84836,"N.GILA 69.00", 19428,"YPGTAP 69.00" ck=1 ,218

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nend

################################################################

, 79093,"NAVAJO 230.00", 79096,"LNGHOUSE 230.000 ck=1 ,139

, 79097,"ANIMAS 115.00", 79112,"MESA FM 115.000 ck=1 ,140

79097,"ANIMAS 115.00", 79116,"SULLIVAN 115.00" ck=1 ,141

79098,"BERGIN 115.00", 79100,"FOOTHILS 115.00" ck=1 ,142

79098,"BERGIN 115.00", 79114,"SAN JUAN 115.00" ck=1 ,143

79100,"FOOTHILS 115.00", 79106,"HOODMESA 115.00" ck=1 ,144

79101,"FRUITAP 115.00", 79102,"FRUITLND 115.00" ck=1 ,145

79101,"FRUITAP 115.00", 79106,"HOODMESA 115.00" ck=1 ,146

79105,"GLADETAP 115.00", 79106,"HOODMESA 115.00" ck=1 ,147

79105,"GLADETAP 115.00", 79109,"LAPLATA 115.00" ck=1 ,148

79105,"GLADETAP 115.00", 79260,"ELPASOTP 115.00" ck=1 ,149

79106,"HOODMESA 115.00", 79116,"SULLIVAN 115.00" ck=1 ,150

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79113,"NAVAJO 115.00", 79114,"SAN JUAN 115.00" ck=1 ,151

10111,"GALLEGOS 230.00", 79027,"GALLEGOS 115.00"ck=1 ,219

14222,"PRESCOTT 230.00", 14355,"PRESCOTT 115.00"ck=1 ,220

14222,"PRESCOTT 230.00", 14355,"PRESCOTT 115.00"ck=2 ,221

16740,"N.HAVASU 69.00", 19074,"N.HAVASU 230.00"ck=1 ,224

16742,"BLKMESA1 69.00", 19019,"BLK MESA 230.00"ck=1 ,225

16744,"BLKMESA2 69.00", 19019,"BLK MESA 230.00"ck=1 ,226

16746,"BLKMSA34 69.00", 19019,"BLK MESA 230.00"ck=1 ,227

16746,"BLKMSA34 69.00", 19019,"BLK MESA 230.00"ck=2 ,228

16800,"HILLTOP1 69.00", 19072,"HILLTOP 230.00"ck=1 ,229

16802,"HILLTOP2 69.00", 19072,"HILLTOP 230.00"ck=1 ,230

16804,"GRIFFITH 69.00", 19310,"GRIFFITH 230.00"ck=1 ,231

17103,"TOPOCK 69.00", 19320,"TOPOCK 230.00"ck=1 ,232

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18003,"AMARGOSA 230.00", 18030,"AMARGOSA 138.00"ck=1 ,233

19012,"MEAD S 230.00", 18173,"MEAD B 69.00"ck=1 ,243

19012,"MEAD S 230.00", 18174,"MEAD A 69.00"ck=1 ,244

19012,"MEAD S 230.00", 26051,"MEAD 287.00"ck=1 ,245

19037,"MEAD 345.00", 19011,"MEAD N 230.00"ck=1 ,257

19038,"MEAD 500.00", 19011,"MEAD N 230.00"ck=1 ,258

19045,"COOLIDGE 230.00", 19044,"COOLIDGE 115.00"ck=1 ,259

19045,"COOLIDGE 230.00", 19044,"COOLIDGE 115.00"ck=2 ,260

19068,"TESTTRAK 230.00", 19217,"TESTTRAK 69.00"ck=1 ,261

19101,"BUCKBLVD 161.00", 19322,"BLYENG1 16.00"ck=1 ,262



19218,"CASAGRND 230.00", 19222,"CASAGRND 115.00"ck=1 ,265

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19310,"GRIFFITH 230.00", 19311,"GRIFFTH1 18.00"ck=1 ,269



19315,"PEACOCK 345.00", 19314,"PEACOCK 230.00"ck=1 ,272

19316,"SOPOINT 230.00", 19317,"SOPOINT1 16.00"ck=1 ,273



19410,"SUNDANCE 230.00", 14990,"SUN G1 13.80"ck=1 ,276

19410,"SUNDANCE 230.00", 14992,"SUN G3 13.80"ck=1 ,277

19410,"SUNDANCE 230.00", 14994,"SUN G5 13.80"ck=1 ,278

19410,"SUNDANCE 230.00", 14996,"SUN G7 13.80"ck=1 ,279

19410,"SUNDANCE 230.00", 14998,"SUN G9 13.80"ck=1 ,280

79032,"GLENCANY 345.00", 79031,"GLENCANY 230.00"ck=1 ,281

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79032,"GLENCANY 345.00", 79031,"GLENCANY 230.00"ck=2 ,282

79053,"PPK WAPA 345.00", 19062,"PPKWAPA 230.00"ck=1 ,283



79061,"SHIP PS 230.00", 79063,"SHIPROCK 230.00"ck=1 ,286

79063,"SHIPROCK 230.00", 79062,"SHIPROCK 115.00"ck=1 ,287

79064,"SHIPROCK 345.00", 79063,"SHIPROCK 230.00"ck=1 ,288

19042,"PARKER 230.00", 19041,"PARKERAZ 161.00"ck=1 ,293

19042,"PARKER 230.00", 19041,"PARKERAZ 161.00"ck=2 ,294

19065,"ED-2 115.00", 19067,"ED-2 12.47"ck=1 ,295

19065,"ED-2 115.00", 19067,"ED-2 12.47"ck=2 ,296

19215,"SPOOKHIL 230.00", 19197,"SPOOKHIL 69.00"ck=1 ,297

19215,"SPOOKHIL 230.00", 19197,"SPOOKHIL 69.00"ck=2 ,298

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19066,"SIGNAL 115.00", 19091,"SIGNAL_A 12.47"ck=1 ,301

19066,"SIGNAL 115.00", 19091,"SIGNAL_A 12.47"ck=2 ,302

14209,"EAGLEYE 230.00", 84865,"EAGLEY E 69.00"ck=1 ,303

14209,"EAGLEYE 230.00", 84866,"EAGLEY W 69.00"ck=1 ,304

19000,"COL-SCIP 115.00", 19093,"COL-SCIP 69.00"ck=1 ,305

19000,"COL-SCIP 115.00", 19093,"COL-SCIP 69.00"ck=2 ,306

19022,"DAVIS 230.00", 17416,"BANK 10 69.00"ck=1 ,307

19048,"EMPIRE 115.00", 19059,"EMPIRE 12.47"ck=1 ,308

19057,"ORACLE 115.00", 19095,"ORACLE 69.00"ck=1 ,309

19057,"ORACLE 115.00", 19095,"ORACLE 69.00"ck=2 ,310

19066,"SIGNAL 115.00", 19092,"SIGNAL_B 12.47"ck=1 ,311

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19071,"ED-4 115.00", 19073,"ED-4 12.47"ck=1 ,312

19071,"ED-4 115.00", 19073,"ED-4 12.47"ck=2 ,313

19204,"HARCUVAR 230.00", 19186,"HARCUVAR 115.00"ck=1 ,317

19206,"HEADGATE 161.00", 19304,"HEADGATE 69.00"ck=1 ,318

19229,"SONORA 69.00", 19230,"SONORA 34.50"ck=1 ,319

19400,"KOFA 161.00", 19401,"KOFA 69.00"ck=1 ,320

19448,"DAVIS 69.00", 19005,"DAVISG5 13.80"ck=1 ,321

19038,"MEAD 500.00", 19011,"MEAD N 230.00"ck=2 ,322

19041,"PARKERAZ 161.00", 19017,"PARKERAZ 69.00"ck=1 ,323

19049,"GILA 69.00", 19425,"GILAMIDA 1.00"ck=1 ,324

19049,"GILA 69.00", 19426,"GILAMIDB 1.00"ck=1 ,325

19050,"GILA YU 161.00", 19049,"GILA 69.00"ck=1 ,326

19050,"GILA YU 161.00", 19049,"GILA 69.00"ck=2 ,327

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19053,"LIBERTY 345.00", 19058,"LIBTYPS 230.00"ck=1 ,328

19097,"ED-5 115.00", 19096,"ED-5 12.47"ck=1 ,329

19097,"ED-5 115.00", 19096,"ED-5 12.47"ck=2 ,330

19225,"LONEBUTT 230.00", 19224,"LONEBUTT 69.00"ck=1 ,331

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6. RELIABILITY CRITERIA

The system will be considered reliable when meeting the NERC/WECC Planning Standards. Additional member reliability criteria as appropriate will be used to determine the reliable operation of the system.

6.1. For Steady-state Load Flow: No system element is loaded more than 100 percent of its continuous thermal rating

under pre-contingency conditions.

No system element is loaded more than 100 percent of the emergency thermal rating after an N-1 contingency.

6.2. For Post-transient Governor Load Flow: NERC/WECC Planning Standards.

A maximum of 7% voltage dip is allowed at any bus in Southern California Edison system under N-1 conditions.

LADWP Adelanto VAR margin test:N-1 - 500 MVAR margin;N-2 - 250 MVAR margin.

In DSW, the 5% reactive margin criteria will be followed for N-1 and the 2.5% reactive margin test will be followed for N-2.

For G-2 only positive margin required.

6.3. Transient StabilityTransient stability runs will be run out to 20 seconds to ensure the system is stable and positively damped.

7. Answers to Specific Questions:

1) When was the last time this path was studied?a) November 2008

2) What is the critical season for this path?a) Summer

3) Are full studies or check cases being done?a) Check studies

4) What are the impacts of this path on system reliability? Are problems local or is there a potential for cascading outside the local area?a) There is no potential for cascading outside the local area exists.

5) What is the limiting factor: transient, reactive, or thermal?a) The limiting factor is thermal.

6) Have load and generation changes been accounted for?a) Load and generation changes are studied as sensitivities.

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8. STUDY SCHEDULE

Study Plan submitted for review................................................................................April 2, 2008 Approval of the Study Plan........................................................................................April 2, 2008

Planning Manager approval of study plan.......................................................................XX, 2008Report(s) out for WECC member review........................................................................XX, 2008Implementation Date....................................................................................... November 1, 2008

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Appendix A

PROCEDURE FOR ANNUAL STUDY PROGRAM

Last updated: May 6, 2023

Standard Directory

All standard programs and their data files, including this file (study.doc) are in H:\GETOOLS.

Disturbances and Base Cases

The list of disturbances to be run, and base cases to run them on, is determined by SRWG in June.

Study Report Directory Structure

Create a directory under H:\STUDY, named for the year (e.g. 98STUDY). Under that you will need the following sub-directories:

CASES – Contains *.sav and *.dyd files for the cases to be used in the study.SWITCH – Store switch decks and information received from members.STD – Contains a subdirectory for each standard disturbance.STABS – Contains a subdirectory for each real disturbance.BODY – Executive Summary, body of report, some tables.APPENA – Appendix A files (case descriptions, SLFS reports, balloon diagrams.APPENB – Appendix B files (tables, disturbance reports).APPENC – Appendix C files (miscellaneous graphics)

Setting Up a Case

Create a directory under H:\STUDY\??STUDY\STABS with a name designating the disturbance case (e.g. 9812 or D9812 – keep it short!)

In this directory, put the switch file for the disturbance (e.g. 9812.swt). The switch file must conform to the input requirements of alldyns.p, and name the input *.sav and *.dyd files in the CASES directory to be used for this disturbance (e.g. “..\CASES\99hs3.sav”). You must execute PSLF from this directory, so that all output files associated with the case will be stored together.

HOW TO GET IT TO EXECUTE LOCALLY, BUT STORE FILES ON THE NETWORK AFTERWARD?????

Reporting

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Area Summary:Run areasum.p to get a summary of positive and negative load and generation, plus losses and area slack machine values, by area.

Supplementary Line Flow Summary:Produced by slfsge.p, which reads slfsge.dat. The dat file may need to be altered for particular case representations. Output is in slfsge.lst. This can be imported into Word and printed out for the mailing (minor touchup can be done as desired, however, do not change the font!)

Inertia Summary:Option at the end of slfsge.p. If asked for, output is on the end of slfsge.lst.

Balloon Diagram:Scheduled interchanges must be entered in the transaction (trans) table for the case. Run balloon.p, which reads template.bal and creates output.bal. The latter is input to either BAL2.EXE, which checks the diagram data and tells you about anything missing, or BAL3.EXE, which actually produces the graphic. The diagram must be printed on the COMPAQ20 in order to look right. Use balloon.bat to run BAL3.EXE and the printout will be automatic.

Preparing Stability Data

All current stability (dynamics) data is in the Master Data File (MDF), named MASTER.DYD. This file is maintained separate from any case.dyd file, is continually updated to reflect the latest and most accurate data, and is posted on the BBS/Web in the directory with current base cases.

MASTER.DYD has all the data in it. If people submit differing load reps for various seasons, it will all be in there (identified with appropriate comments). That means you won't be able to run any case directly against the MDF, but you can look there for the most recent modeling. Notes will be maintained in the file about what you have to do to it before you can read it with rdyd.

To build a base case dynamics file, start with a copy of MASTER.DYD and alter it as necessary to produce a case.dyd file. That will involve deleting some data, and possibly changing some, and/or taking certain models OOS for that specific case. Area Coordinators need to inform us with their case submittal about anything like that in their area(s).

“Permanent” changes to MASTER.DYD can be submitted any time. Until 2000, they should be given to Merilyn. Changes will be made by editing the file. Complete new datasets for an area are not acceptable. Our preferred way of receiving changes is as individual new records for altered models. However, for lodrep (blwscc) or lodshed (lsdt9) data, if people want to submit a whole new section to replace their old one, that will be OK.

Checking Stability Data

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rdyd:A list will be produced on the log screen of: a) models which refer to a bus not found in the case; b) models that match a bus, but not the generator/load they are supposed to apply to. None of these are fatal, but they may indicate problems which will be fatal later on. (Example: the id or bus number for an on-linegenerator is different in the powerflow and the MDF. When you initialize, there will be no model for that generator.)

For 10.1, you can retrieve the listing from the log screen by right-clicking on the window top bar, and choosing Edit – Mark. The marked text goes onto the Clipboard and can be dumped into a TextPad or Kedit file for further processing. In Ver. 11, all screen output collects in a file term.log, from which you can retrieve what you want after you close PSLF.

Run modstat.p. This turns off all models for generators that are OOS in the powerflow. It is not strictly necessary, but will circumvent numerous “garbage” messages and curve values. (When you run alldyns.p, this step is done automatically.)

init:Be sure to turn data fixup on!

Ignore the messages about the initialization of motors (actually induction generators).

Messages about missing dynamics data for in-service devices are immediately fatal and must be addressed. Machines can be netted for the moment, if someone has promised you data for them. Otherwise, typical data should be put in, and the owners informed of the fact. (MVWG recommendation, supported by TSS.)

Messages about governors outside of limits are not immediately fatal (as they were in WSCC), but should be investigated and cured. This condition creates an initial disturbance – the program slams Pgen back to the limit. The most common cause is over-scheduling of the generator, but errors in mwcap, pmax (dynamics), mbase, and other governor data can also cause it. For very new gas turbines, the governor probably should not be represented at all, since these tend not to be operative under load.

eder:As soon as you have initialized, you have a *.rep file (pslf.rep, unless you change it). The command eder reads this file and gives a list (in edit table form) of the data changes made. It is long and not usually very informative. However, note any messages about “Duplicate models.” These must be fixed, or they will screw up your run in unpredictable ways.

Run usteady.p. This also requires a *.rep file. It gives a edit table listing of models with unsteady initial conditions, where you can define how big an initial change you are interested in seeing. The default is 0.1, which is usually fine. Unsteady exciters are not normally a problem. Anything else should be looked into.

run: (no disturbance – must run)Change the next pause time to 10.0 and hit Enter. If you get immediate divergence (“Network failed to converge”) or other obvious problems, see the section on Special

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Techniques, below.

plot:Assuming you have fixed all the problems found along the way, and the run proceeds to 10 seconds, you can then plot it. If you use the plot command on the PSLF menu, your current *.chf file will be loaded automatically. If you get out of PSLF and into PLOT, you will need to getp in order to load it.

Hit view. In the Type column, find all (F4) spd (shaft speed, p.u.). Tab right to the Spread column and sort it backwards. Move back to the bus number column (P) for the top row, and hit F8, then Enter. This will plot the first six curves for the machine with the greatest speed deviation. Other variables worth looking for the worst spread on are efd and vt. However, efd values are not comparable between machines (not p.u.), and vt is not particularly sensitive to many problems. (Don’t bother looking at the worst spreads for the entire table – it is such a mixed bag that it will tell you nothing useful.)

run: (ringdown – optional)Another standard data checking run is the ringdown disturbance. The Chief Jo brake is applied for 30 cycles, and the run is continued to 36 seconds. Curves that flatten nicely in the first 15-20 seconds may develop problems later on. You should use alldyns.p for this one.

run: (standard disturbance – must run)Currently this is the double Palo Verde unit outage. Use alldyns.p

Comment Case Mailing

Report of PSS On Line:Produced by pssge.p, which reads pssge.dat. The dat file may need to be altered for particular case representations. Output is in pssge.lst. This can be imported into Word and printed out for the mailing (minor touchup can be done as desired, however, do not change the font!)

Percent Compensation ReportProduced by pctcomp.p, which reads pctcomp.dat. The dat file may need to be altered for particular case representations. Use pctcompd.p (debug) to make sure the dat file is OK. Output is in pctcomp.lst. This can be imported into Word and printed out for the mailing (minor touchup can be done as desired, however, do not change the font!)

Area Reserve Factor ReportProduced by arearesv.p, which reads arearesv.dat to get the appropriate typical ranges. Output is in arearesv.lst. This can be imported into Word and printed out for the mailing (minor touchup can be done as desired, however, do not change the font!)

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