1 market trials real-time market / lfc weekly update july 30, 2010

http://nodal.ercot.com 1

Market TrialsReal-Time Market / LFC

Weekly Update

July 30, 2010


Antitrust Admonition

ANTITRUST ADMONITION

ERCOT strictly prohibits Market Participants and their employees who are participating in ERCOT activities from using their participation in ERCOT activities as a forum for engaging in practices or communications that violate the antitrust laws. The ERCOT Board has approved guidelines for members of ERCOT Committees, Subcommittees and Working Groups to be reviewed and followed by each Market Participant attending ERCOT meetings. If you have not received a copy of these Guidelines, copies are available at the Client Relations desk. Please remember your ongoing obligation to comply with all applicable laws, including the antitrust laws.

DISCLAIMER

All presentations and materials submitted by Market Participants or any other Entity to ERCOT staff for this meeting are received and posted with the acknowledgement that the information will be considered public in accordance with the ERCOT Websites Content Management Operating Procedure.


Agenda

• Antitrust Admonition

• Environment Report– Planned / unplanned outages – Known Issues

• Standing Reports and Updates– General reminders / updates– Real Time Market / LFC Update– State Estimator Convergence Statistics– 5 Hour Full System Market and Reliability Test Results– 24 Hour Full System Market and Reliability Test Update– 24 Hour Full System Market and Reliability Test Reminders

• Question and Answers / General Discussion

ERCOT asks that Market Participants log into the WebEx session using their company name and then their name. This will allow ERCOT to take roll-call offline


Environment Report: Planned / Unplanned Nodal Outages

• Planned Outages

• N/A

• Unplanned Outages

• 07/28/2010 01:00 P.M. – 07/28/2010 01:30 P.M.

– Users may have experienced intermittent issues in downloading real time LMP data. The root cause of the issue is currently being investigated.


Known Issues

Recently Opened Issues• SCED Step One curve generation incorrect when (0 MW, $0) point is in

submitted EOC– SCED uses an incorrectly formed energy offer curve when a market

participant submits a curve that includes a price/quantity pair of $0 at 0MW. To workaround this issue, market participants should substitute a nearby pair for this point, such as $0.01 at 0MW.

• NP6-621: SE Load Report - Individual Load on Electrical Buses (MIS Secure)– Sums of loads only represents a percentage of the actual ERCOT load– Affects CDR

Recently Closed Issues• The following EDW reports had previously been failing with error messages:

– NP8-501-Monthly Resource Energy Deployment Performance Report (MIS Certified Report)

– NP8-541-Monthly Responsive Reserve Performance Report (MIS Secure Report)


Standing Reports and Updates: General Reminders / Updates

Reminders/Updates• Updates to Tracking Artifacts

– The Known Issues tracking sheet will refresh overnight to the Readiness center at http://nodal.ercot.com/readiness/markettrials/rtm/index.html

• Network Model Update– The network model database was updated on Friday 7/23/2010– The next network model database load will occur Monday 8/2/2010– ERCOT has posted the Redacted Network Model on the MIS -> Grid ->

Long-Term Planning page• Questions or Issues encountered during Full System tests

– Please use the [email protected] address before, during, or after any test for problems or clarifications

http://nodal.ercot.com/readiness/markettrials/rtm/index.html

mailto:[email protected]


Standing Reports and Updates: General Reminders / Updates

Reminders/Updates• Nodal Public Reference Data Extract Updates (see July 27th Market

Notice)– Updates will post on the MIS on 8/3/2010– Updated version 0.16 DDLs and XSDs included in “PRDE Extract User

Guide” at http://nodal.ercot.com/readiness/reports/index.html

• 24 Hour Full System and Reliability Test Window (see July 27th Market Notice)– August 3rd, 4th, or 5th window announced. See “24 Hour Full System and

Reliability Test” updates for more details.

http://nodal.ercot.com/readiness/reports/index.html

05/03/23


Real Time Market / LFC Update

Real Time Market / LFC Update


SCED Week 26•System Lambda at $2250 offer cap for 381 intervals (compared to 93 last week)•SL $2251-$3000 for 15 intervals; $3001 for 123 intervals•EOC submissions down to 92% from normal of 99%


State Estimator Convergence


State Estimator Convergence Update

State Estimator Daily Convergence Statistics(these percentages are graphed in the next slide)

Month Day % Convergence (Including Solved w/

Mismatch)

JUL 19 99.66JUL 20 98.65JUL 21 98.00JUL 22 97.60JUL 23 96.68JUL 24 99.27JUL 25 99.64JUL 26 99.65JUL 27 99.31JUL 28 97.87


State Estimator Convergence Update

Need Updated

05/03/23


5-Hour Full-System Market and Reliability Test Results

Stacy Bridges


5-Hour Full System Reliability and Market Test Results

5-Hour LFC Test (7/21/2010)

Time Activity0800 Hotline call was made by the ERCOT Operator announcing the 1100

start time for the test0929 ERCOT Operators activated an OC3 for solving congestion in Zonal

1100 Hotline call what made announcing the test was starting and the VDI was issued

1119 First participating QSE confirms switch over to Nodal control

1214 Final participating QSE confirms switch over to Nodal control

1218 Hotline call what made announcing that all participating QSEs on Nodal control

1531 Hotline call what made announcing that participating QSEs were being switched back to Zonal

1535 First participating QSE confirms switch back to Zonal control

1616 Final participating QSE confirms switch back to Zonal control



Constraints Encountered During the Test

Start Constraint Reason10:00 Roanoke Switch OC3 Loss of Roanoke Switch T1 345/138KV

autotransformer overloads West Denton - Fort Worth Substation 138KV - 108% of 218 MVA rating.

12:20 Jack County - Reno OC3 Loss of Jack County - Reno 138KV overloads Wise County - Bridgeport TU 138KV - 105% of 199 MVA rating.



Commons Issues Seen During the Test • Net MW different between zonal and Nodal• Three Part Offers Missing• Three Part Offers Not covering full range of generator (compared to HSL)• JOU units providing inconsistent data between owners• Several issues where RARF data incorrectly submitted and limiting actions during

the test (e.g. LRL set too high, Ramp Rate Reasonability Limit set too high, etc)• Telemetry coming in suspect• AS telemetry inconsistent between zonal and nodal• Using Lower / Raised block status to operationally control unit's limitations• Invalid Resource Status Codes (e.g. RST = 0)• Incorrect Resource Status Codes (Generating, but offline and available• MW output greater than HSL



Frequency



CPS1 Score

CPS1 During the 7/21/2010 5-Hour LFC Test:

CPS1 Score (1 Min.) Average

All in Zonal (1000-1119) 115.01Transition to Nodal (1119-1214) 88.60

All in Nodal (1214-1535) 110.50Transition to Zonal (1535-1616) 119.05

All in Zonal (1616-1800) 176.61

CPS1 Score (1 Min.) Average by Hour

HE 11 140.14HE 12 73.19HE 13 110.94HE 14 105.53HE 15 120.02HE 16 104.08HE 17 160.68



Nodal Generation to Be Dispatched and Load



Regulation and System Load



Regulation and System Frequency



Regulation and ACE Scores



Regulation – Zonal vs. Nodal


• Frequency vs. Expected Output Deviation



• Completion Criteria:– The rolling CPS1 one minute average score must equal or exceed 100% during

the test period. • Note that CPS1 metric will not apply to periods during testing wherein

system tuning is being performed by either ERCOT or Market Participants– HE12-73, HE13-112, HE14-103, HE15-120, HE16-103

– Zonal Commercially Significant Constraints (CSCs) and Closely Related Elements (CREs) managed below thermal limits. The Zonal CSCs were not activated during the test

– Local Congestion managed below thermal limits. Two local constraints binding during the test

– Stability limits managed below transfer limits No stability limits were activated during the test

– No NERC Disturbance Control Standard (DCS) failure if applicable Not applicable during the test

– No LFC-SCED system issues that result in termination of the test. No– Procedural and software fixes have been verified to address lessons learned

from previous rounds of testing Migrated patches into NPROD and verified prior to the test. There were no shift factors transfer failures during the test.

Note: The individual QSE GREDP analyses from the 5-Hour test will be distributed the week of July 26th




• Gredp Analysis• For this analysis; X=5%, Y=5 MW, and

Z=10%• Performance does not appear to have

varied drastically from the 8-hour test• Criteria:

• Non-IRRs must have a GREDP less than X% or Y MW for 85% of the intervals in which GREDP was scored

• IRRs must have a GREDP less than Z% or the output must be less than their expected output for 95% of the intervals in which GREDP was scored

Percent of Non-IRR Generation Resources that Met the Protocol Criteria

All Resources 79.74%

Resources Providing Regulation 86.90%

Combined Cycle Resources 93.22%

Coal and Lignite Resources 97.50%

Diesel Resources 100.00%

Gas Steam (Non-Reheat Boiler) Resources 25.00%

Gas Steam (Reheat Boiler) Resources 72.22%

Gas Steam (Supercritical Boiler) Resources 33.33%

Hydro Resources 88.89%

Nuclear Resources 100.00%

Simple Cycle (Greater than 90 MW) Resources 100.00%

Simple Cycle (Less than 90 MW) Resources 34.04%

Percent of IRRs that Met the Protocol Criteria 33.33%

Number of IRRs that had an Interval for which

GREDP was scored9

IRRs

Non-IRRs


• CPS1 scores did seem to improve during periods in which GREDP performance improved

• Period during test in which performance was not calculated due to a protocol GREDP performance exclusion

http://nodal.ercot.com


24-Hour Full-System Market and Reliability Test Update

Stacy Bridges


24-Hour Full System Reliability and Market Test Update

24- Hour Full-System Market and Reliability Test • Timeline– The 24-Hour Workshop was provided during the 7/23 RT Market Call

• http://www.ercot.com/calendar/2010/07/20100723-MT– The 24-Hour Test will be conducted Aug 4 – 5 – Proposing a start time of 12pm• Market Notices– A Market Notice was sent July 27 confirming the upcoming 24-Hour test – A follow-up notice to be sent today (7/30) confirming Aug 4 as the start day– A final Market Notice will be sent on the day of the test to confirm that the test will be

conducted that day• Other details– On the test day, a hotline call will confirm the start time of the test (approximately 2-3 hours

prior to start)• A market-facing WebEx conference will be provided—WebEx details will be

emailed to Nodal Transition Project Managers the week of the test– ERCOT and Market Participant staff should be available and ready to field troubleshooting

calls at 8am on the first day of the test– A System Wide VDI will be issued immediately prior to the start of the test

http://www.ercot.com/calendar/2010/07/20100723-MT



24- Hour Full-System Market and Reliability Test (continued)• Proposed Tuning Windows– ERCOT system-tuning windows:

• Window One: 4 – 6 PM (on the starting day of the test)• Window Two: 6 – 8 AM (on the ending day of the test)• Note: Any adjustments to the timing of these tuning windows will be

communicated as the windows draw near – Market Participant system-tuning windows:

• Proposing that MPs who wish to perform system tuning do so during times that do not overlap with the following test activities:

– ZonalNodal /Nodal Zonal switchover activities– Operational scenarios– ERCOT system tuning windows



24- Hour Full-System Market and Reliability Test (continued)• Operational Scenarios– Issue Non-Spin Deployments

• ERCOT plans to issue Non-Spin Deployments to Generation Resources during the 24-Hour LFC Test

– ERCOT will deploy a small MW quantity of Non-Spin to offline Generation Resources that have a zonal Non-Spin obligation during the test period

– The Non-Spin will be deployed first in zonal and then will be deployed to the same QSEs/Resources in nodal

• The scenario is expected to last approximately one hour• Hotline calls will be used to announce the start and end of this scenario


Support from the Market Participants• Each Market Participant will need to have their experts on hand during normal

business hours (8:00 am – 5:00 pm) each business day during the week of the test until the completion of the test

• Support hours will need to be extended on test day– During the day of the test, the hours of support will need to be extended from

8:00 am on the test starting day until 12pm on the test completion day:


Aug 4 Aug 5

Day One of TestDay Two of Test


Support from the Market Participants (continued)• Support staffing for this testing should be reflective of the level of staffing that is

planned for nodal post-go-live• Market Participants should staff as appropriate to manage Real-Time Nodal

submittals and to address issues for the duration of the test• ERCOT staff will be contacting MPs during these hours as necessary to support

ICCP, Market Submittals, LFC


Day One of TestDay Two of Test



Requesting Updates to Nodal Contacts for 24-Hour LFC Test• QSEs with Resources are requested to review their Nodal Contact information as

previously submitted per the Contact Declaration Form and make any necessary changes for contacts who will be supporting ICCP, LFC, Market Data Submittals

• The current Nodal Contact Declaration Form v1.1 is available at http://nodal.ercot.com/readiness/rq/documents/index.html

• Submit any updates or questions to [email protected] by 12:00pm on August 2, 2010

• Designate day and night contact by (D=Day, N=Night)• In addition, please ensure that the contact information for your Real-Time desk is

accurate so that the ERCOT Control Room can contact you as needed during the 24-Hour LFC Test

http://nodal.ercot.com/readiness/rq/documents/index.html

mailto:[email protected]


24-Hour Full-System Market and Reliability Test

RemindersStacy Bridges

24-Hour Full System Reliability and Market Test Reminders

Manual dispatch instructions during the LFC test• Beginning two hours prior to the LFC test, ERCOT will stop using

OC1s and OOMEs and plans to use OC3s to manage congestion– The one exception to this is that ERCOT will use OC1s for the W-N and

the N-H stability limit (non-thermal IROL for NERC) during transition periods to and from Nodal control

– ERCOT has created and tested constraints for these limits in the Nodal system which can be activated for SCED as needed and should provide similar dispatch to the OC1s

• ERCOT may be required to use Zonal manual dispatch instructions to solve congestion

• ERCOT will set the Nodal Base-Point to match the Zonal manual dispatch instruction

• The QSE will continue to follow the Nodal Base Point if they are still under Nodal control




RSTs to be used during Ramp-Up / Ramp-Down• RST during Ramp-Up:

• Between 0 MW and LSL, the telemetered RST should indicate online status• SCED will dispatch the Resource to its current output

• Between LSL and HSL, the telemetered RST should reflect unit activity per the Resource Status Codes provided in the Nodal Protocols

• RST during Ramp-Down (to OFF):• Use RST of “OFF” to take unit out of pool of Resources available for economic

dispatch by SCED• This method is being suggested for purposes of LFC Testing and may not

be the method used for nodal market go-live• RLC will set HDL/LDL that it passes to SCED such that the Resource will

be ramped offline


Non-Spin Deployment (Nodal and Zonal system)• If required, Non-Spin will be deployed from the Nodal system during the 5-Hour

LFC Test (this is not a formal operational scenario for this test)• Zonal will also continue to deploy Non-Spin• When Non-Spin is deployed in one system, ERCOT will select the same

QSE/Resources for deployment in the other system• QSEs are requested to keep their telemetered Resource Status Codes, Non-

Spin Responsibilities, and Non-Spin Schedules in Nodal reflective of their Zonal Non-Spin obligation

• After a Non-Spin deployment, QSEs must also update their Nodal EOCs, Output Schedules, Telemetered Resource Status Codes, and Resource Limits in preparation for Resources coming online so that SCED can dispatch Resources appropriately once they become available

• The QSE should also adjust the telemetered NSRS Schedule in the Nodal system to reflect the Nodal deployment




Market Participant EMS Wind Unit Data Note• Set Real-Time telemetered HSL value to current MW output per (NP 6.5.5.2(3))

• Additional detail was added to this protocol reference as part of NPRR 214• If the Wind-Powered Generation Resource (WGR) is not being curtailed, the

HSL should be set at the actual net output of the WGR• In event of curtailment (i.e., a SCED instruction at least two MW lower than the

unit’s current MW output), the HSL should be set at the capability that the facility would have if it were not being curtailed• This estimate should be based on wind speed, power curves, and turbine

availability• The QSE shall set the HSL within one SCADA cycle after receiving a SCED

Base Point Dispatch Instruction from ERCOT• This will allow the QSE to more easily detect if the WGR must respond to a

curtailment instruction

http://nodal.ercot.com/protocols/nprr/201-225/214/index.html


Questions

Q&A

1 market trials real-time market / lfc weekly update july 30, 2010

Documents