计及UPFC的电力系统多目标无功优化

Multi-objective reactive power optimization incorporating UPFC

统一潮流控制器(UPFC)可以实现对电力系统潮流的灵活控制,从而充分发挥电力系统的潜力。基于UPFC的等效注入功率模型,以实现电力系统运行安全性和经济性为目标,建立了计及UPFC的多目标无功优化模型。求解方法为带精英策略的快速非支配排序遗传算法(NSGA-Ⅱ),通过改进算法的快速非支配排序方法,使之能有效处理潮流计算不收敛的解;应用层次分析法(AHP)确定模型中各个目标的相对权重,并以此对Pareto最优解集进行排序,得出无功优化的最佳方案。最后对IEEE30节点系统进行仿真计算,结果表明了该模型和算法的有效性和正确性。

The unified power flow controller （UPFC） can control the power flow flexibly, which gives full play to the potential of the power system. In order to improve safety and economy of power system, this paper introduces a kind of model for multi-objective reactive power optimization with UPFC based on the power injection model of UPFC. NSGA-II algorithm is used to solve the model. By improving the fast nondominated sorting approach, NSGA-Ⅱ algorithm can deal with the divergence solution of power flow calculation effectively. After obtaining the Pareto optimal solutions, the analytic hierarchy process （AHP） is adopted to set each objective function＇s weight and rank these solutions to determine the best solution of reactive power optimization. The simulation result of the IEEE30 bus system demonstrates the proposed model and algorithm is corrective and efficient.