This paper proposes a selective harmonic active tuning control method for hybrid active power filters (HAPFs). A HAPF is composed of a voltage source inverter (VSI) and an LC filter. With this method, the VSI in the HAPF is controlled as a virtual capacitance that varies with the dominant harmonic frequencies. Thus, the LC filter can be forced to be tuning at these frequencies, which significantly improves the harmonic filtering characteristic of the LC filter. Meanwhile, to enhance the filtering performance in the case of a small power grid impedance or to damp the resonances between an LC filter and the grid impedance, the harmonics in the grid source current are detected and proportionally fed back to the controller, which brings about an effect equivalent to adding a series harmonic resistance on the grid source side. The proposed control method has the advantages of a simple control structure and easy implementation. Simulation and experimental results confirm the effectiveness and feasibility of the proposed method.

本文提出了一种用于混合有源电力滤波器（HAPF）的选择性谐波有源调谐控制方法。HAPF由电压源逆变器（VSI）和LC滤波器组成。使用这种方法，可以将HAPF中的VSI控制为随主谐波频率变化的虚拟电容。因此，可以迫使LC滤波器在这些频率下调谐，这显着改善了LC滤波器的谐波滤波特性。同时，为了在电网阻抗较小的情况下提高滤波性能，或抑制LC滤波器与电网阻抗之间的谐振，需要检测电网电源电流中的谐波并将其按比例反馈给控制器，从而实现该效果等同于在电网源侧增加串联谐波电阻。所提出的控制方法具有控制结构简单，易于实现的优点。仿真和实验结果证实了该方法的有效性和可行性。