基于单周控制的单极调制单相有源电力滤波器

有源电力滤波器(active power filter,APF)可以滤除谐波和补偿无功分量。单周控制双极调制方法控制并联型有源电力滤波器存在直流分量问题,开关损耗大、稳定工作范围窄、原有的单周控制单极调制方法不能快速跟踪电网电压的变化。针对以上问题,提出了应用于单周期控制有源滤波器的新的单极调制方法,控制方程正负半波对称且引入电网电压量,实现了直流分量基本为零和快速平滑跟踪电网电压,扩大了有源滤波器的工作范围。仿真结果证明了其可行性。

Single-phase Active Power Filter with One-cycle Control Under Unipolar Operation

Active power filter(APF) is one of the viable solutions to eliminate reactive components and harmonics in the power grid.APF with one-cycle control under bipolar operation have problems of DC component,great switching loss and narrow stable operation range,and the original method of unipolar modulation is not able to follow the changing voltages of power grid.So a new method of unipolar modulation is proposed which is used for APF with one-cycle control.The axial symmetry between the positive half curve and the negative in control equation and the import of grid voltages make the proposed method have the ability of eliminating the DC component and tracking the changing voltages smoothly.The feasibility of the proposed method is proved by the simulation results.