Aiming at the problem of steady-state deviation of microgrid frequency caused by the randomness of re-newable energy power generation,in order to control the frequency fluctuation of the power grid,an improved self-dis-turbance rejection controller is designed on the basis of traditional disturbance rejection control to optimize the load frequency control of wind-solar-diesel-storage microgrid.Considering the system instability caused by the actual nonlinearity of governor backlash and power generation rate constraints,an anti-saturation error compensation strategy for multi-region and multi-generator is proposed,which improves the control performance of the controller and com-bines the repetitive control with the automatic disturbance rejection control,and the composite control method improves the accuracy of the controller and enhances the robustness of the system.Simulink is used to establish a sim-ulation model of load frequency control of the two-region power system,and the PID controller,the traditional NCB controller and the improved NCB controller are simulated and compared,and the simulation results show that the im-proved controller can quickly converge the frequency deviation to zero,so that the frequency of the power grid is kept within the rated range,thereby greatly improving the stability of the system and improving the dynamic performance of the system.
关键词
微电网/负荷频率控制/自抗扰控制/复合控制/调速器侧隙/发电速率约束
Key words
Microgrids/Load frequency control/Disturbance rejection control/Composite control/Governor dead band/Generation rate constraints
维普
万方数据