ELEC4310 Power System Analysis Assignment 3
Fault Analysis
Submission due date: 4 pm Thursday 16th May 2025
Use the base case 13-bus power system provided and make the following changes:
1. Add the following sequence data to each machine object.
2. Add the following sequence data into each AC line object
3. Set all transformer connections to YG-YG (YN-YN) and add the following sequence data into each transformer (2 Winding) object.
After making all changes, conduct a power flow and ensure it converges. Then, complete P1 and P2 as described below. (System Base: 100 MVA.)
The report should include a concise summary of the results:
• Table of required results (voltage and current value), python code (in P2) and bar graphs for comparisons. (Bar graphs can be generated by using Excel.)
• Comments and discussions should accompany each section. It may be a short paragraph.
• The corresponding saved .sav and .sld files used in this section need to be attached in the submission .zip file.
1) P1 Fault Current Study by Using PSS\ E Interface (25 Marks)
Perform. the following different type of fault analysis for the slack bus and the lowest voltage bus.
• Bolted three-phase balanced fault.
• Line to line fault on phase B and C.
• Bolted Single line to ground fault on phase A
• Bolted double line to ground fault on phase B and C
Show the fault current of all three phases a, b and c (in polar form) on the fault bus during fault. Please comment on results.
2) P2 Get Voltage of Each Bus During Fault by Using Python (75 Marks)
1) Use python to perform. bolted three-phase balanced fault analysis for the slack bus, and the lowest voltage bus. Use bar graphs to show system voltage profiles of all buses during the fault against the base case (pre-fault system). Please provide the python code you have used for this question and comment on results. (15 Marks)
2) Used python to perform line-to-line fault analysis for the slack and lowest voltage buses. Use bar graphs to show system voltage profiles of all three phases during the fault against the base case (pre-fault system). Please provide the Python code you have used and comment on the results. (15 Marks)
3) Make sure all transformer connections are YG-YG. Use python to perform. bolted single- line-to-ground, and bolted double-line-to-ground fault analysis for slack bus and the lowest voltage bus, respectively. Use bar graphs to show system voltage profiles of all three phases against the base case (pre-fault system). Please provide the python code you have used and comment on results. (Please make sure the Connection Code of each transformer are “8-Series path, ground each side” as shown in figure below) (15 Marks)
4) Change all transformer connections to Δ-Δ . Use python to conduct bolted single-line-to- ground, and bolted double-line-to-ground faults the same as (3). Use bar graphs to show system voltage profiles of all three phases against the base case (pre-fault system).
Please provide the python code you have used and comment on results. (Please change the Connection Code of each transformer to “4 – No series or ground paths” as shown in figure below) (15 Marks)
5) According to the results obtained from above questions, compare fault currents among different types of faults using a table. What is your conclusion? (The conclusion should summarise all comparisons in P1 to P2. Also consider severity of each type of fault that places on the system if it occurs.) (15 Marks)
Useful Functions in psspy:
sequence_network_setup(), scmu_2(), scinit(), scbus2()
IMPORTANT SUBMISSION INFORMATION
(a) All case (.sav) files, diagram (.sld) files, python (.py) scripts must be named
appropriately. There should be one folder for each task. Compress all five folders in a single zip file, named ########_PSSE_files , where ######## is your 8-digit student number.
(b) Your PSS/E report must be submitted to Blackboard directly in PDF version. The report itself should not be included in the zip file.
(c) Make sure you have answered all the questions.
(d) This report should be no more than 12 - 15 pages (one-sided only, Arial/Times New
Roman/Calibri, font size 12, single line spacing with 2cm margin on all sides). The appendix does not count. You should place tables and graphs into the body of the report. The report's figures, tables and codes are counted in the page limit.
(e) The report must include a concise summary of results for each section, along with comments and discussions. It could be as short as one sentence or as long as a paragraph.
(f) Place figures as close as possible to where you refer them to in the context.