VK有源电力滤波器在电源电压畸变时的谐波提取方法

Harmonic Detection Method for Active Power Filter Considering Distorted Voltage

分析了有源滤波器(APF)基于旋转坐标系下进行坐标变换的谐波检测方法。该方法在电网电压畸变情况下能很好地检测和补偿电网中的谐波电流和无功电流。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。仿真与实验均验证了所提出的谐波检测方法的有效性,基于旋转坐标系下进行坐标变换的谐波检测方法的有源电力滤波器具有良好的工作性能。

The paper analyses a detection method, which is based on the coordinate transformation of voltages and currents in rotating reference frame. The method＇s traits can detect accurately and compensate harmonic and reactive current of power network ,even if the supply voltage is distorted or asymmetric. Applied to the three phase three wire system, it can calculate the instantaneous value of the selective harmonic current. Matlab analysis and experimental results demon-strated the effectiveness of the current detection method, active power filter with the proposed control system is of well working characteristics.