并联混合有源滤波器逆系统解耦控制

针对并联混合有源滤波器(SHAPF)这一强耦合非线性系统的控制问题,提出了一种基于逆系统方法的SHAPF反馈线性化解耦控制策略.首先根据SHAPF非线性数学模型,采用逆系统方法生成其α阶积分逆系统,进而构造出解耦的伪线性系统,然后利用极点配置方法对伪线性系统进行综合,设计了系统的闭环控制器,并给出了系统零动态的镇定条件,保证了闭环控制系统的稳定性.最后仿真实验表明该控制策略能够有效消除电网中的谐波电流,并且与传统线性反馈-前馈控制策略相比,该控制策略具有更好的动静态性能.

Inverse system method based decoupling control of shunt hybrid active power filter

To tackle the strong coupling and nonlinearity of the shunt hybrid active power filter (SHAPF) system, we propose a novel feedback linearization control strategy based on the inverse system method. To the nonlinear model of SHAPF, we apply the inverse system method to produce its ®th inverse system, from which the decoupled pseudo-linear system is obtained. This pseudo-linear system is synthesized by using the pole assignment method to design the controller for the closed-loop system. The stabilization condition of the zero dynamics of the SHAPF is presented, which ensures the stability of the close-loop system. Simulations show that the harmonics can be effectively eliminated by the proposed control strategy, and a better steady-state and transient performances can be achieved in comparison with the traditional linear feedback-feedforward control strategy.