一种新的统一电能质量调节器的双环复合控制方法

A New Double-Loop Compound Control Method for Unified Power Quality Conditioner

针对统一电能质量调节器中传统PI控制器的跟踪能力较差、补偿性能有限的问题,结合基于内膜原理的重复控制理论,提出了一种基于PI控制内环、重复控制器外环的复合电流控制策略,将其应用到统一电能质量调节器(Unified Power Quality Conditioner)电流跟踪控制中,采用指令电流前馈控制,改进复合电流控制策略,该复合电流控制策略集合了PI控制和重复控制的优点,提高了电流跟踪的快速性和稳态补偿精度,使用PI控制器和重复控制器相互协调控制,降低系统的稳态误差,实现了对电流指令信号的快速响应。采用双闭环PI控制作为UPQC的电压跟踪控制策略。理论分析和仿真结果验证了UPQC的补偿效果以及并联侧重复双环电流控制策略的有效性和可行性。

Aiming at the problem that the traditional PI controller in the unified power quality regulator is poor and the compensation performance is limited,and combined with the repetitive control theory based on the endometrial principle,a composite current control strategy based on PI control inner loop and repetitive controller outer ring is proposed in this paper.The composite current control strategy is applied to the current tracking control of the unified power quality regulator(Unified Power Quality Conditioner),and the composite current control strategy is improved by using the command current feed-forward control.The composite current control strategy combines the advantages of PI control and repetitive control,thus the current tracking speed and the steady-state compensation accuracy are improved.The PI controller and the repetitive controller are used to control each other,which can reduce the steady-state error of the system and realize the fast response to the current command signal.The double closed-loop PI control is used as the UPQC voltage tracking control strategy;the theoretical analysis and simulation results verify the UPQC compensation effect and the effectiveness and feasibility of double-loop current control strategy.