2. 1
TABLE OF CONTENT:
1. Introduction and Background……………………………………………………2
2. Purposeand Goal of the Project…………………………………………………2
3. Risks …………………………………………………………………………………………5
4. Recommendations……………………………………………………………………..7
5. APPENDIX…………………………………………………………………………………….10
3. 2
Introduction
We are considering a system consisting of 5 individual generating
stations all providing power to the collector substation through a 34.5
KV single phase JCN cable. And the substation is returns provides power
to the load.
Purpose for the Technical Report
I am going to perform a power flow analysis for the given single line
diagram and also contingency analysis with the given data and assumed
data to show the effects of the wind turbine being operated with other
loads.
Fig 1. Single line diagram
We have assumed that all the generators in the given single line
diagram have the same capacity of 50 MW real power supply. And the
Wind turbine to be 2.5 MVA is the given value. Also we consider one
the generators as the slack. We are going to consider the variable data
depending upon different cases for the basis of analysis.
4. 3
Data Table
Transmission Line 34.5 KV JCN Cable
Transformer
1. Sub-station
2. Wind-turbine
3. Generators
Rating
1. 34.5KV-161KV 100 MVA
2. 600 KV-34.5 KV 2.5 MVA
3. Variable.
Generator
1. Wind
Turbine(generator 3)
2. Generators (1,2,4,5)
1. Variable
2. Variable
Buses (1-13) 1. 1-6,2-7,3-8,4-9,5-11--
600KV-34.5KV
2. 6-12,7-12,8-12,9-12,11-
12—34.5KV-34.5 KV
3. 12-13—34.5 KV-161KV
Load (transmission Grid) Variable
I am going to use Power World Analysis tool as the basis of my studies.
And I am going to consider an initial case with 0 load and check for zero
load discrepancies in the circuit.
CASE 0
I am going to perform an initial open circuit test on the circuit to check
for any discrepancies so as to proceed with the load flow analysis.
5. 4
Fig 1.2 Power World Analysis Single Line Diagram
Fig 1.3 Power Flow List
I am going to add the contingency analysis results for the initial case of
0 load in the system.
6. 5
Fig 1.4 Contingency Analysis
Conclusion-From the initial case it is clear with zero contingency
violation’s and that the system is set up for further analysis depending
on further assumptions.
RISKS:
I am going to assume 2.5 MVA load for the transformer connected to
the wind turbine and 100 MVA for the substation collector 50 MVA for
load for the other transformer and check the results.
CASE 1
AS we assumed certain values pertaining to the circuit we get the
results simulated in the diagram below.
Data Table
Transmission Line 34.5 KV JCN Cable
8. 7
Fig 1.4 Contingency Analysis for CASE 1
Conclusion:-You can observe that for the given load we have 10
contingency violations and there is 800% MVA over reach for the
transformer which makes it susceptible to iron losses and possible
insulation failure and effectively reducing its efficiency of the
transformer also affecting a grid reliability. Similar results are possible
for the transformer with 100 MVA as well.
For an given transformer rating of 2.5 MVA for the transformer
connected to the wind turbine the minimum load for the other
transformer to the substation collector is 24.5 MVA each so as to safely
allow the follow of power to the load with voltage imbalance in the
other transformers and 0 contingency violation in the circuit due to the
other transformers.
Recommendations
One possible remedy for the result is upgrading the transformer
connecting the wind turbine to a safe value so as to avoid the
contingency violation and also controlling the MVA limit for the
transformer.
9. 8
CASE 2
For the transformer connected to generator 1,2,4,5 are all loaded at 50
MVA. The minimum value for the transformer to be upgraded is 25.5
MVA. With this result is seen that there are 0 contingency violation and
no voltage over reach occurrence.
Data Table
Transmission Line 34.5 KV JCN Cable
Transformer
7. Sub-station
8. Wind-turbine
9. Generators
Rating
7. 34.5KV-161KV 100 MVA
8. 600 KV-34.5 KV 25.2
MVA
9. 50 MVA
Generator
5. Wind
Turbine(generator 3)
6. Generators (1,2,4,5)
5. 20 MW
6. 20 MW
Buses (1-13) 7. 1-6,2-7,3-8,4-9,5-11--
600KV-34.5KV
8. 6-12,7-12,8-12,9-12,11-
12—34.5KV-34.5 KV
9. 12-13—34.5 KV-161KV
Load (transmission Grid) 100 MW
10. 9
Fig 1.5 Power flow Analysis for CASE 2
Fig 1.6 Contingency Analysis for CASE 2
Conclusion- We conclude that we have a solution for our assumption
that we have 2.5 MVA transformer depending on our assumption one
of the way to eliminate the effects of contingency violation is to
11. 10
upgrade the transformer in series with the wind turbine to a specific
safe value in our case which was calculated to 25.5 MVA
Another remedy for the system to work is to the open the circuit
connecting the wind turbine to the load.
APPENDIX
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