Probabilistic Evaluation to Voltage beyond Limits of Power System Taking Account of Zero Output State of Wind Power Farm

To analyze quantitatively the voltage beyond limits of power system including wind farms, based on the establishment of probabilistic model of wind generation output and load, proposes a model of probabilistic evaluation to voltage beyond limits of power system taking account of zero output state of wind power farm. Considers the state of zero power output of WPG to be an incident, which occurs with a given probabilistic, with computational tools based on probabilistic load flow of cumulant method, calculate the conditional probabilistic to voltage beyond limits of system under a single incident occurred, then obtain the probabilistic to voltage beyond limits of system according to total probability formula. Example of IEEE30 system calculates the probabilistic to voltage beyond limits of system under the zero output states of wind farms at different nodes, analyzes the impact on the probabilistic to voltage beyond limits of system coused by every wind farm by sorting. Simulation results shows that the model and algorithm can provide a reference for the operation department.