基于有源阻尼方法带LLCL型滤波器的APF控制策略的研究

Research on APF Control Strategy with LLCL Type FilterBased on Active Damping Method

有源电力滤波器(Active Power Filter,APF)是一种新型的用于补偿谐波和无功功率的电力电子装置,为提高并联型APF的补偿精度。以三相三线制带LLCL型滤波器的APF为研究对象,对APF的控制策略包括电流内环的控制和直流侧电压外环的控制进行研究,分析得出电压外环采用PI控制,电流内环采用PI控制和重复控制有机结合的复合控制策略。利用Matlab/Simulink仿真工具搭建了仿真模型,验证了带LLCL型滤波器的并联APF具有良好的补偿性能,可以明显的降低电网电流的波形失真度(Total Harmonic Distortion,THD)。

Active power filter is a new type of power electronic device used to compensate for harmonics and reactive power.In order to improve the compensation accuracy of parallel APF.The research object is APF with LLCL type filter in three-phase three-wire system,.The control strategy of APF includes the control of the current inner loop and the control of the DC side voltage outer loop.It is analyzed that the voltage outer loop adopts PI control,The inner current loop adopts a compound control strategy combining PI control and Repetitive control.A simulation model was built using Matlab/Simulink simulation tools,which verified that the parallel APF with LLCL type filter has good compensation performance and can significantly reduce the waveform distortion of the power grid current.