Power System Transient Instability Risk Assessment Based on Generator Curtailment Index

The mechanism of power system instability is analyzed in this paper,and then the transient stability emergency control based on generator curtailment is proposed.After that,the probability models of 6 random factors which affect the power system transient stability-the failure type,the system structure,the load level,the distribution of failures,the position of failure at the line, the clear time are established.Then power system instability risk assessment algorithm including these factors is proposed.This algorithm is based on the Mete-Carlo simulation,and the variance coefficient of expected generator curtailment is used as criterion of algorithm ending.The affection of several important factors on the risk is simulated at last.The result shows that the expected generator curtailment is suitable to assessment system risk.The risk is affected obviously by the load level and the clear time,and other random factors have litde affection.