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有源电力滤波器(Active Power Filter,APF)补偿电流检测环节对其补偿性能有着重要的影响。三相电网电压不对称且畸变时,传统的p-q法和ip-iq法无法准确实现对负荷综合补偿。采用基于同步旋转坐标系法实现对基波正序有功分量的提取,在电网电压畸变时,增设一种基于低通滤波器的基波正序电压提取电路,该检测方法避免了传统锁相环对检测相位的误差,能够准确实现负载的综合补偿。同步旋转坐标系法即为将负荷电流合成矢量投影到电网电压合成矢量上,与其同频同相的电流即为基波正序有功电流分量,从而得到谐波、负序和无功分量,实现对负荷的综合补偿。最后给出了基于Fdatool(Filter Design&Analysis Tool)工具箱低通滤波器详细的设计方法。理论分析和仿真结果证明所提检测方法的正确性和有效性。
Active Power Filter (APF) The compensation current detection has an important influence on the compensation performance. Three-phase grid voltage asymmetry and distortion, the traditional p-q method and ip-iq method can not accurately achieve comprehensive compensation for the load. Based on the synchronous rotation coordinate system, the active components of the fundamental positive sequence are extracted. When the grid voltage is distorted, a new fundamental positive sequence voltage extraction circuit based on low-pass filter is added. The detection method avoids the traditional phase-locked loop On the detection of phase error, the load can be accurately integrated compensation. The synchronous rotation coordinate method is to project the load current synthesis vector onto the grid voltage synthesis vector, and the current with the same frequency and the same phase is the fundamental positive sequence active current component, so as to obtain the harmonic, the negative sequence and the reactive component, Comprehensive compensation of the load. Finally, a detailed design method based on Fdatool (Filter Design & Analysis Tool) toolbox low-pass filter is given. Theoretical analysis and simulation results show that the proposed method is correct and effective.