基于PI+重复控制的三相四桥臂有源电力滤波器的研究

Research on Three-phase Four-leg Active Power Filter Based on PI+Repetitive Control

针对三相四线制低压配电系统存在的谐波问题,将三相四桥臂有源滤波器作为研究对象。在谐波电流检测和电压环控制方法已知的基础上,主要对电流环的控制算法进行研究,针对电流环控制选用传统PI控制方式时,动态响应速度较快,但存在稳态精度不高的缺点。而电流环控制选用重复控制时,动态响应速度不高,但存在稳态精度较高的优势。因此,为了弥补各自控制的不足,决定将PI控制与重复控制并联使用,并通过Matlab搭建了仿真模型。对比不同控制方式的仿真,结果表明:基于PI和重复控制并联的控制方式,既可以通过重复控制改善补偿精度,又可以用PI控制加快响应速度,验证了该方案的可行性。

Aiming at the harmonic problems existing in the three-phase-four-wire low-voltage distribution system,the three-phase four-leg active power filter is taken as the research object.Based on the known methods of harmonic current detection and voltage loop control,the control algorithm of current loop is mainly studied.When the traditional PI control mode is selected for current loop control,the dynamic response speed is faster,but the steady-state accuracy is not high.When the current loop control uses repeated control,the dynamic response speed is not high,but there is an advantage of higher steady-state accuracy.Therefore,in order to make up for the shortcomings of the respective controls,it is decided to use the PI control in parallel with the repetitive control,and the simulation model is built by Matlab.Comparing the simulation results of different control methods,it is shown that the control method based on PI and repeated control can improve the compensation accuracy through repeated control,and can speed up the response speed by PI control,which verifies the feasibility of the scheme.