Probabilistic evaluation of static voltage stability taking account of the variation of load and stochastic distributed generations

The impact of renewable distributed generation on power system is an hot topic in smart grid. Accounting for the uncertainties of wind power and load, a probabilistic evaluation method was proposed for static voltage stability based on two-point estimate method (2PEM) and continuous power flow. By 2PEM, the probabilistic problems could be handled as those corresponding to deterministic problems. The continuous power flow method was to get the load margin and PV curves with iterations for static voltage stability. The numerical results of IEEE 33-bus test system show that the proposed method maintains a high accuracy and reduces the computation burden.