非对称型滤波电路的有源电力滤波器系统设计

Design of A symmetric Filter Circuit Active Power Filter System

针对电力系统中非线性负载引起的谐波污染问题,提出一种非对称型滤波电路的有源电力滤波器(APF)拓扑结构。该拓扑包括了三相变流器和两相滤波电抗器,通过控制变流器输出的线电压对两相滤波电抗器支路电流进行直接控制,利用三相电流的约束关系,间接控制第三相电流。此处通过建立该拓扑结构的电气模型,详细分析了其滤波特性和工作原理,推导控制方程,设计电流控制方法。为验证所提拓扑及控制方法,搭建了仿真与实验平台进行验证,实验结果表明该拓扑不仅可在减少一相滤波器件下实现三相电流补偿,而且能实现与并联型APF具有相同补偿效果和抗扰动特性。

A asymmetric filter circuit active power filter(APF)topological structure is discussed to manage harmonic pollution of power system caused by nonlinear load.The topology includes a three-phase converters and two-phase filter reactors.Based on the constraint relationship of three-phase current,the third phase current is indirectly controlled by controlling the converter line voltage to control the branch current of two-phase filter reactor.The electric model of the topological structure is built to analyze the filter characteristics and operation principles in detail.The control function is discussed and the current control method is presented.To validate the topology and control method,the simulation and experimental platforms are built to verify.The experimental results show that the topology can not only realize three-phase current compensation with asymmetric filter circuit,but also has the same filter characteristics and dynamic performance with parallel APF.