三相有源电力滤波器(APF)通常用来补偿非线性负载所引起的谐波电流.传统的PI控制带宽有限不能实现无静差输出,为了提高三相并联型有源电力滤波器的补偿性能,提出一种新型的谐波电流复合控制算法.该算法将PI控制器和重复控制器并联在控制系统的前向通道,共同对APF输出产生影响.给出了具体的系统控制框图,以及电流动态快速补偿算法和重复控制的重复环境构造等问题.通过系统仿真和实验,证明该控制算法能显著地改善系统动态性能,消除稳态误差,提高系统的滤波效果.%Three-phase shunt active power filter( APF) were often used to compensate the harmonic current derived from non-linear load. Proportion-integral controller cannot be used simply to control the output current without any steady error due to its limitation of current tracking capability. Novel compound control architecture with digital PI and advanced repetitive controller in parallel was put forward in this paper to enhance the compensation characteristic of three-phase shunt APF. They connect with the forward channel of current loop in parallel and exert influence together on the output of system. A specific control block diagram of system, current dynamic and fast compensation algorithm, repetitive environmental construction of repetitive control and other issues have been given. It can be proved by simulation and experimental results that control system can significantly improve dynamic performance ,eliminate steady-state error,and improve the filtering effect.
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