并联型有源电力滤波器在非理想电源电压下的控制

首先提出了并联型有源电力滤波器在不对称、非正弦电源电压情况下补偿电流指令的准确计算方法。该方法基于同时对三相电压、电流进行旋转坐标变换和投影变换。所求得的补偿电流指令为非线性负载电流中除了基波正序有功分量之外的全部电流分量。应用于三相三线制电路时，该方法可以计算任意次谐波电流的瞬时值。进一步提出了在不对称、非正弦电源电压情况下，并联型有源电力滤波器产生补偿电流的无差拍控制法。理论分析、仿真及实验结果表明了所提出的计算和控制方法的有效性，从而为并联型有源电力滤波器在非理想电源电压条件下的正确控制提供了一条有效途径。所提出的方法对其它类型有源电力滤波器的控制也有借鉴意义。

SAPF CONTROL STRATEGY UNDER THE CONDITION OF NON-IDEAL SOURCE VOLTAGES

This paper presents the accurate calculation approach of the compensating current reference of shunt active power filter (SAPF) under the unsymmetrical and non-sinusoidal supply voltage conditions. The proposed approach is based on the rotating coordinate transformations of three-phase voltages and currents and the projection of d-q current in the direction of d-q voltage. The resulting current reference equals to the difference between the instantaneous current of nonlinear load and its fundamental positive sequence active component. Used in the three-phase three-wire network, it can determine arbitrary single order harmonic current. Further, this paper reports the dead-beat current control for SAPF to track the current reference under the unsymmetrical and non-sinusoidal supply voltage conditions. Theoretical analysis, simulation and experimental results demonstrate the effectiveness of the proposed calculation and control approaches. Besides the control of SAPF, the proposed calculation and control approaches can be applied to the control of other types of active power filter.