A Fast Estimation of Load Power Margins for Branch Outage Contingencies

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  • 線路故障に対する高速な負荷余裕推定
  • センロ コショウ ニ タイスル コウソク ナ フカ ヨユウ スイテイ

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Abstract

This paper proposes a fast computation method to assess the voltage stability of a power system for branch outage contingencies. The load power margins with respect to saddle node bifurcations under faulted conditions are efficiently estimated. Nonlinearities of the power flow equations are partially taken into account to considerably improve the accuracy of stability assessment. Numerical examinations in IEEE 14, 30 and 57 bus systems show that, even in such small systems where the effects of single line outage is much larger than those of large systems, maximum error was 10%. The computation time of the method amounts to α+Kβ, where α is the computation time for the saddle node bifrucations and for LU factorization of the power flow Jacobian, β is almost equivalent to that of the forward and backward substitutions for the factorized Jacobian, and K is the number of branch outage contingencies.

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