Contingency Screening and Ranking Considering Volatility of Wind Power

In order to avoid only considering seriousness of fault in contingency screening and ranking, a new method is proposed which is based on probabilistic insecurity index. In this paper, randomness, economy and volatility of wind power and load are considered. Besides, probability density functions of wind power and load are used to modify the model of expected loss. Firstly, according to typical fault set, dynamic security region and probabilistic insecurity index are determined. Then the volatility of wind power and load could be transformed into the volatility of generator trip and load shedding. Finally, based on modified model of expected loss, the proportion of expected loss of each contingency in fault set can be computed. Then use this proportion to screen and rank contingencies. Simulations on New England 10-generator 39-bus system show that based on this new method, contingencies could be screened and ranked rationally and accurately.