单调谐并联混合有源电力滤波器控制策略研究

摘要

A DC link voltage controller and double loop control strategy with grid current and the fifth harmonic current feedback are proposed to deal with the low compensation precision of the single-tuned parallel hybrid active power filters (PHAPFs) due to low bandwidth. Specifically, the small signal model and transfer function were derived firstly based on the circuit topology of the PHAPF. The double loop controller and the voltage controller were designed. Simulation investigation was done and a prototype was built. Simulation and experimental results verify that the proposed control strategies could not only acquire very high steady-state compensation precision as well as fast dynamic responses but also reduce the cost of the equipment since only two phases of grid current are required to be detected.%针对单调谐并联混合有源电力滤波器的补偿精确度受控制系统带宽严重制约的问题,提出一种同时反馈电网电流和五次谐波电流的双闭环控制策略,并对其直流侧稳压控制器进行详细的分析和设计.根据单调谐并联混合有源滤波器的电路拓扑结构,推导系统在旋转坐标系下的小信号模型及其传递函数,分别设计电网电流控制器,五次谐波电流控制器和电压环控制器.对采用所提出的控制策略的有源滤波器进行仿真研究并制作实验样机.仿真和实验结果表明,该控制策略具有很高的稳态补偿精确度和动态响应速度,易于数字实现,且由于只需要检测两路电网电流,节省了装置成本.