Equipment sensitivity evaluation based on cloud model due to voltage sags
Xiaolu Sun · Power System Protection and Control · 2011
The critical problem faced by the evaluation of equipment sensitivity due to voltage sag is the uncertainty including randomness and fuzziness.In this paper,the randomness and fuzzinessa re integrated into a cloud model.This model can present the uncertainty of voltage tolerant curve(VTC)of sensitive equipment roundly.The cloud drop is used to transform the qualitative uncertainty into the quantitative uncertainty,which realizes the quantitative description of complex uncertainty.After the numerical value of cloud drop distribution is obtained by Simpson numerical integral method,the sensitivity of equipment due to voltage sag can be calculated.Comparing the proposed method with existing fuzzy evaluation method,the results showt hat this method is proper and accurate,can present the above mentioned uncertainty more reasonably,and has theoretical value and application prospect.