Abstract
The paper describes a probabilistic method for transmission grid
security evaluation. Power system security is the ability of the power
system to withstand sudden disturbances such as short circuits. The
method presented here uses event and fault trees and combines them with
power system dynamic simulations. Event trees model the substation
protection and trip operations after line faults. Different event tree
end states (fault duration, circuit breaker trips) are simulated with
power system dynamic analysis program. The dynamic analysis results
(power system post-fault states) are then classified into secure, alert,
emergency and system breakdown. The probabilities, minimal cut sets and
grid level importance measures (Fussell-Vesely, risk increase and
decrease factors) are calculated for the total and partial system
breakdown. In this way, the relative importance of the substation
devices regarding to the system breakdown can be reached. Also the more
and less likely contributing factors to system breakdown are received.
With this method, an existing 400 kV transmission grid with its line fault and device failure statistics is analysed.
Original language | English |
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Pages (from-to) | 277-287 |
Journal | Reliability Engineering and System Safety |
Volume | 93 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2008 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Substation
- Protection
- Failure
- Reliability
- Power system
- Transmission
- Importance