一种新颖的应用于三相四线有源电力滤波器的混合电流控制方法

通过对三相四桥臂有源滤波器电路(APF)的分析，指出其主功率桥臂的电流控制与中线电流控制是相互独立的.提出了一种新颖的混合控制方法，即三相主功率桥臂的电流控制采用空间矢量调制（SVM），而中线桥臂输出电流的控制则采用滞环控制.该方法将四桥臂的电流控制分解为三相相电流控制和中线电流控制，从而大大简化了APF的电流控制过程.较之于其他的电流控制方案，该方法运算量小，具有控制简单、容易实现等优点.仿真结果证实了该方案的正确性.

A novel hybrid current control method applied in three-phase four-leg APF

Based on the analysis of circuit of a three-phase four-leg APF,a conclusion was put forth,which means that the current control of the three power legs is independent from the neutral leg.A novel hybrid control method was presented.SVM was used to control the output current of the three main power legs,while hysteresis current control was applied to control the output current of the neutral leg. As a result,the current control of four legs was decomposed into the control of the three main power legs and the control of neutral leg,which can sharply simplify the current control of APF.Compared with other current control methods,this new method has advantages such as easy of calculation,control and realization.Simulation results prove the correctness of this method.