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Transmission Topology Control with N-1 Contingency Criteria Analysis of Experimental Results by Gokturk Poyrazoglu and Charles Hashem Transmission Topology Control in OPF Method: Consider transmission network as a variable, not a

SLIDE 1

Transmission Topology Control with N-1 Contingency Criteria

Analysis of Experimental Results

by Gokturk Poyrazoglu and Charles Hashem

SLIDE 2

Transmission Topology Control in OPF

Method:

– Consider transmission network as a variable, not a parameter – By changing the network, operating state of the system will change (voltages, generation)

Results:

– Slight difference on the voltage and generation may prevent congestion on the lines – This may lead smooth LMP variance rather than large jumps on the affected busses – The operating cost of the system will reduce

SLIDE 3

N-1 Contingency Criteria

An operation state should be able to move to

another operation state in case of one contingency.

Types of Contingencies:

– Loss of a transmission line – Loss of a generator

SLIDE 4

N-1 Contingency in Transmission Topology Control

Motivation:

– After changing the network, we don’t want to

perate the system in worse state than the
riginal case.

– We want to keep exactly same N-1 Contingency condition as the original case even after a switching operation.

Method:

– Check N-1 Contingency Condition for original case – Check N-1 Contingency Condition after switching

SLIDE 5

Computational Method

SLIDE 6

Transmission Topology Control

Challenges:

– First, Solve (N+1) cases to determine N-1 Contingency condition for the original case

where N is the number of branches in the network

– Second, Solve (N-1) cases to determine N-1 Contingency condition for the best candidate – The best scenario: total 2N cases – The worst scenario: total N2 cases – Analysis of experimental result for 30-bus system: 3N cases

SLIDE 7

Parallel Computation

SLIDE 8

Parallel Computation Flow Chart

Check N-1 Contingency Condition for the Original Case Sort the results in descending

rder, then

Create a candidate set.

SLIDE 9

Analysis of Experimental Results

1. Total Operating Cost
2. Energy Efficiency (Apparent Power)
3. Real Power Losses
4. LMP Variance

SLIDE 10

Total Operating Cost

SLIDE 11

Total Operating Cost

1 6 11 16 21 26 31 36 41 46 51 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000

Trading Periods Total Operationg Cost ($)

Original Network Without N-1 Contingency With N-1 Contingency

SLIDE 12

Total Operating Cost

1 6 11 16 21 26 31 36 41 46 51 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000

Trading Periods Total Operationg Cost ($)

Original Network Without N-1 Contingency With N-1 Contingency

SLIDE 13

Total Operating Cost (Zoom in)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 6,000 6,200 6,400 6,600 6,800 7,000 7,200 7,400 7,600 7,800 8,000

Trading Periods Total Operationg Cost ($)

Original Network Without N-1 Contingency With N-1 Contingency

10% Cost Reduction 5% Cost Reduction

SLIDE 14

Total Operating Cost

1 6 11 16 21 26 31 36 41 46 51 1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000

Trading Periods Total Operationg Cost ($)

Original Network Without N-1 Contingency With N-1 Contingency

FIRST 26 PERIODS 1.54 % Cost Reduction Without N-1 Contingency 1.48 % Cost Reduction With N-1 Contingency SECOND 26 PERIODS 0.17 % Cost Reduction Without N-1 Contingency 0.09 % Cost Reduction With N-1 Contingency

SLIDE 15

Real Power Losses

SLIDE 16

Real Power Losses

1 2 3 4 5 6 7 8 9 10 1 6 11 16 21 26 31 36 41 46 51

Real Power Loss (MW) Trading Periods

Original Network Without N-1 Contingency With N-1 Contingency

SLIDE 17

Real Power Losses (Zoom in)

3 3.5 4 4.5 5 5.5 6 6.5 7 26 31 36 41 46 51

Real Power Loss (MW) Trading Periods

Original Network Without N-1 Contingency With N-1 Contingency

SLIDE 18

LMP Variance @ Several Busses

Busses next to the Congested Lines High LMP variance

SLIDE 19

LMP Variance

1) Less LMP with Transmission Switching 2) High LMP with Transmission Switching

SLIDE 20

LMP @ Bus 20

100 200 300 400 500 600 1 6 11 16 21 26

LMP @ Bus 20 ($/MWh) Trading Periods

Original Network Without N-1 Contingency With N-1 Contingency

SLIDE 21

LMP @ Bus 15

50 100 150 200 250 300 350 400 1 6 11 16 21 26

LMP @ Bus 15 ($/MWh) Trading Periods

Original Network Without N-1 Contingency With N-1 Contingency

SLIDE 22

LMP @ Bus 6

20 40 60 80 100 120 1 6 11 16 21 26

LMP @ Bus 6 ($/MWh) Trading Periods

Original Network Without N-1 Contingency With N-1 Contingency

SLIDE 23

LMP @ Bus 8

20 40 60 80 100 120 1 6 11 16 21 26

LMP @ Bus 8 ($/MWh) Trading Periods

Original Network Without N-1 Contingency With N-1 Contingency

SLIDE 24

LMP @ Bus 25

20 40 60 80 100 120 1 6 11 16 21 26

LMP @ Bus 25 ($/MWh) Trading Periods

Original Network Without N-1 Contingency With N-1 Contingency

SLIDE 25

LMP @ Bus 27

20 40 60 80 100 120 1 6 11 16 21 26

LMP @ Bus 27 ($/MWh) Trading Periods

Original Network Without N-1 Contingency With N-1 Contingency