有源电力滤波器的谐波检测方法研究

针对基于FFT的谐波检测和ip-iq法的不足，详细分析并实现了有源滤波器基于旋转坐标系下进行坐标变换的谐波检测方法。该方法在电网电压存在不对称情况下均能很好地检测和补偿电网中的谐波电流和无功电流，根据需要，还可以检测和补偿任意次谐波电流。理论分析和实验结果验证所提出的控制方法的有效性，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。

Research on Currents Detection Method for Active Power Filter

In this paper, current detection method, which is based on the coordinate transformation of voltages and currents in rotating reference frame is suggested and carried out to overcome the defects FFT-based harmonic detection method and ip-iq method in detail. Its traits are that can accurately detect and compensate harmonic and reactive current of power network even if the supply voltage is distorted or asymmetric. Theoretical analysis and experimental results demonstrate the effectiveness of the current detection method, active power filter with the proposed control system is of well working characteristics.