Download - A Ccc Report
-
8/13/2019 A Ccc Report
1/11
LAB4 AC CONTINGENCY CALCULATION REPORT
EE461: POWER SYSTEMS
COLORADO STATE UNIVERSITY
-
8/13/2019 A Ccc Report
2/11
-
8/13/2019 A Ccc Report
3/11
Lab 4 Create AC Contingency Calculation Report
- 2 -
Trace starts the program. The next line names the (N-1) contingency. The third line
describes which line will be removed. The next line ends the contingency. Then theprocess is repeated for all (N-1) contingencies that are desired.
Monitor file (*.mon)
The monitor file tells the power flow simulator which branches to be supervised during
the (N-1) contingencies. A sample of the monitor file will now be given:
COM
COM Monitored Element Description File for SAMPLE Study, Outage
COM
MONITOR BRANCHES IN SUBSYSTEM OVERAL
MONITOR VOLTAGE RANGE SUBSYSTEM OVERAL 0.90 1.10
MONITOR VOLTAGE DEVIATION SUBSYSTEM OVERAL 0.5 0.5
MONITOR INTERFACE ZONE6H RATING 500 MW
152 3004
3002 3004
ENDEND
The first line after the comments informs which branches to monitor in the subsystem
named OVERAL. The second line sets a per unit voltage range for that subsystem. Thethird line gives a +/- deviation from the prescribed values in line two. The fourth line
indicates the power rating for a defined set of lines. The following two lines tell exactly
which branches to monitor (from bus # to bus #). The first END ends that particular zone
to be monitored. This is repeated for each additional zone that may be of interest, and thisfile is completed with a final END to stop the monitor file.
Subsystem file (*.sub)
The subsystem file informs the power flow analysis to only look at a prescribed section,
or zone, of the overall network. A sample of the subsystem file will now be given:
COM
COM System discription file for SAMPLE FLOW STUDY
COM
SUBSYSTEM OVERAL
BUS 101
BUS 102
BUS 151
BUS 152
BUS 153BUS 154
BUS 155
END
END
The first line after the comments names the subsystem OVERAL as indicated in themonitor file. The seven bus number lines indicate which busses are to be included in the
subsystem. The first end stops the subsystem and the final end concludes the file.
-
8/13/2019 A Ccc Report
4/11
Lab 4 Create AC Contingency Calculation Report
- 3 -
ACCC
The contingency, monitor, and subsystem files are utilized by the AC Contingency
Calculation (ACCC) feature of PSS/E to perform a power flow study on a prescribed
zone. The ACCC produces an analysis of the power system.
Using the *.con, *.mon, and *.sub to create an ACCC report
For the purpose of this lab a sample.con, sample.mon and sample.sub file are provided as
examples to perform an ACCC analysis. Start PSS/E and load the sample.sav file. To
perform an ACCC analysis click on the Power Flow drop down menu and selectSolutionAC contingency solution (ACCC).
The AC Contingency Solution window will be displayed:
-
8/13/2019 A Ccc Report
5/11
Lab 4 Create AC Contingency Calculation Report
- 4 -
A Distribution Factor Data File (DFAX) needs to be created by loading the provided
sample.con, sample.mon and sample.sub files. Click on the Create DFAX button, andthe Build Distribution Factor Data File window will be displayed:
Click on the three dots next to the Subsystem description data text field to load
the sample.sub file.
Locate the directory containing the sample files to select the Sample.sub file and clickOpen. The sample.sub file will be loaded in the Subsystem description data text field in
the Build Distribution Factor Data File window.
-
8/13/2019 A Ccc Report
6/11
Lab 4 Create AC Contingency Calculation Report
- 5 -
Next, click on the three dots next to the Monitored element data text field to loadthe sample.mon file.
Select the Sample.mon file and click Open. The sample.mon file will be loaded in the
Subsystem description data text field in the Build Distribution Factor Data File window.
Now, click on the three dots next to the Contingency description data text field to
load the sample.con file.
Select the Sample.con file and click Open. The sample.con file will be loaded in theSubsystem description data text field.
-
8/13/2019 A Ccc Report
7/11
Lab 4 Create AC Contingency Calculation Report
- 6 -
Next, a location for the DFAX output file needs to be assigned. This is done by clicking
on the three dots next to the Distribution factor data output file text field.
Select the File name text field, type sample.dfx to name the DFAX output file, and
click Open. This will create the output file in the directory listed in the window and can
be created in a different directory if needed. The sample.dfx file will be loaded in theDistribution factor data output file text field in the Build Distribution Factor Data File
window.
The Build Distribution Factor Data File window will look like the one below after all thesample files and Distribution factor data output file have been specified.
Click OK to return to the AC Contingency Solutions window, with the sample.dfx file
loaded in the Distribution factor data output file text field.
-
8/13/2019 A Ccc Report
8/11
Lab 4 Create AC Contingency Calculation Report
- 7 -
Finally, a location for the ACCC output file needs to be assigned. This is done by
clicking on the three dots next to the Contingency output file text field.
Select the File name text field, type sample.acc to name the ACCC output file, and click
Open. This will create the output file in the directory listed in the window and can be
created in a different directory if needed. The sample.acc file will be loaded in theContingency output file text field in the AC Contingency Solution window as shown
below:
Click Solve to solve the system with the loaded sample files.
Now, click Reports to load the AC Contingency Reports window:
-
8/13/2019 A Ccc Report
9/11
Lab 4 Create AC Contingency Calculation Report
- 8 -
Leave everything set to the default values and click the Go button to run the ACCC
report.
Click close to exit the AC Contingency Reports window, click close again to exit the ACContingency Solutions and return to the terminal window.
Click on the report tab to view the completed ACCC Report.
-
8/13/2019 A Ccc Report
10/11
Lab 4 Create AC Contingency Calculation Report
- 9 -
The monitored branch section shows all the branches that were overload due to a
contingency. The contingency section shows which branch was automatically taken outof service by the ACCC, which resulted in an overload. The base case contingencies
show the system intact overloads before any branches were removed from service.
Scroll to the right on the report window to view the rating of the line in MWs, the powerflow of the line in MWs, and the percent overload.
At the bottom of the report the Monitored voltage report & Contingency legend can be
seen, but is not of significant importance for this lab.
-
8/13/2019 A Ccc Report
11/11
Lab 4 Create AC Contingency Calculation Report
- 10 -
QuestionsThe sample.sav data file must be open to perform this section of the lab.
Using the sample.con contingency file, the sample.mon monitor file and the
sample.sub subsystem file that have been provided, create a sample.dfx DFAX and a
sample.acc AC contingency file. Solve the system with the loaded sample files and runthe ACCC report as shown above. View the report generated by PSS/E and print out the
report, this print out will need to be included in the lab report. It will also be helpful inanswering the following questions.
1) Which six branches suffer from overloads during the BASE CASE contingencyand what is their percentage of overload? ______________ ________
_ ______________ _____ _
2) Looking at the NUC-HYDRO contingency, which branches suffer fromoverloads that did not suffer from overloads during the Base Case, and what is
their percentage of overload?_________ _____ __ ____Of the branches suffering from overloads during the Base Case, which one(s)
got worse during this contingency, and by how much?________ __
____ __ ____Did any of these branches actually see a reduction in overload, if so, which ones
and by how much were they reduced?________ __
____ __ ____
3) Which of the contingencies created the highest number of overloaded branches?
___ ____ __ __
Which branch was taken out of commission in this contingency? __ _ ____
__ __ __ __
4) Find the DNTN-CAD contingency. What is the rating of the branch betweenbus #202 and #203 (in MW) and what is the actual power flow (in MW) on this
branch? __ __ __
What is the rating of the branch between bus #204 and #205 (in MW) and what is
the actual power flow (in MW) on this branch? _ _
__ _ _Assuming a power factor of 0.9, how much actual power (in MVA) must the
power company provide to each of these branches? _ _
__ _How much actual power (in MVA) must the power company provide to each of
these branches if the power factor was at 0.8, just 10% lower? _ _
_ _