Stochastic optimal reactive power dispatch in a power system considering wind power and load uncertainty

With the increasing penetration of wind power, its uncertainty has occasioned a serious impact on the safe and stable operation of a power system. Reactive power optimal dispatch of a wind power system is a nonlinear mixed integer programming problem. While satisfying multiple constraints, the optimal value of reactive power control parameters is determined to optimize a specific objective function. A multi-objective reactive power stochastic optimal dispatching model for a power system considering wind power and load uncertainties is established. Two objective functions, i.e. active power loss minimization and voltage stability index minimization, are set up. The multi-objective optimization model is solved by the method of ε-constrained optimization, and the optimal compromise solution is selected by the method of fuzzy satisfaction degree. Two different cases are designed for simulation on the IEEE-57 bus system. The simulation results show that the proposed model and method can effectively solve the reactive power optimal dispatching problem of a power system with wind power, significantly reduce the active power loss and improve the system voltage stability. © 2020, Power System Protection and Control Press. All right reserved.