The active failure is important to the power system reliability. The effect of the active failure is proposed and analyzed to evaluate the power system reliability by the amending parameter method and the simulating failure method. in this paper. The need of the considering active failure is verified by the analysis of the reliability evaluation of the IEEE-RTS system, the most serious fault state and the system weaknesses evaluated by the methods above. The analysis of the IEEE-RTS system indicates that the effect of the active failure on the system reliability of is effective and applied.
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