基于状态优化的单相有源滤波器边带控制方案

分析了单相有源滤波器电流边带控制方案的特性，指出将单个桥臂人为控制对象而造成的在定边带条件下开关频率变化范围大、定频率条件下控制精度差的弱点。提出应将有源滤波器看成一个整体，利用桥臂间的关联关系，以所有桥臂的状态变化作为滤波器的控制手段，构造了基于状态优化的边带控制方案。理论分析和仿真结果表明，在相同的边带要求下，该方案可以大大降低器件的开关频率，这对于大功率有源滤波器的工程实现非常有利。

A NOVEL HYSTERESIS CONTROL STRATEGY FOR SINGLE-PHASE ACTIVE POWER FILTER BASED ON STATE-OPTIMIZATION

This paper presents a single- phase active power filter adopting a novel state optim ized hysteresis current control strategy. U nlike traditional hysteresis current control,which takes every single leg as the control object,the proposed strategy takes all the legs as a whole by considering the connection of the legs and controls the state that is defined by every leg's status to trace the reference current. Theoretic analysis and simulation result have proved the effectiveness of the proposed strategy,especially the low switching frequency under given hysteresis,comparing to former hysteresis control strategy.