基于模糊控制的风电场群并网点电压调节方法

VOLTAGE REGULATION METHOD ON PCC OF WIND FARMS BASED ON FUZZY COORDINATION

为改善电力系统电压跌落状态下双馈型风电场群的电压性能,采用模糊协调控制方法考虑风电并网系统同步发电机自动电压调节器(AVR)和电力系统稳定器(PSS)之间的同步调节问题,通过优化设计模糊控制器减轻电网扰动情况下AVR和PSS之间的相互制约,并调整二者增益使其提供最佳性能从而补偿并网点电压降落、降低双馈风力机的无功需求。仿真结果表明,通过AVR和PSS之间的模糊协调控制能够有效减少风电并网点电压跌落,加快稳态电压恢复,降低风场无功损耗,改善风电并网系统的电压稳定。

In order to deal with voltage performance enhancement of DFIG-based wind farms integrated in large-scale power systems under voltage dips,this paper adopts the fuzzy coordination to solve the problem. Considering coordination between automatic voltage regulator(AVR)and power system stabilizer(PSS)of synchronous generators,the fuzzy coordinator is designed to eradicate destructive interactions between AVR and PSS in grid disturbance conditions. It adjusts the AVR and PSS gain to enforce them to give the best performance in fault situations. As a result,the proposed coordination supports the voltage mitigation in the point of common coupling(PCC)under voltage dips and reduces the reactive power demand of the DFIGs. The simulation results show that the fuzzy coordination between AVR and PSS can reduce the voltage dips of PCC and restore stability quickly. Moreover,it can reduce the reactive power loss of the grid,and enhance the stability of the power system.