采用空间矢量检测谐波电流的有源电力滤波器仿真研究

SIMULATION STUDY OF ACTIVE POWER FILTER DETECTING HARMONIC CURRENTS BY SPACE VECTOR

利用空间矢量概念提出了谐波电流开环检测和闭环检测两种方法。在开环检测方法中,在复平面上利用低通滤波器和积分移相环节提取基波正序空间矢量,通过相移补偿环节对低通滤波器的相移进行补偿,从而准确检测出三相基波正序电流和谐波电流。还针对开环检测法无法补偿电路参数引起误差这一缺点,提出基于空间矢量的自适应闭环检测方法,利用自适应算法不断修正滤波器的参数使其工作于最佳状态,从而提高了电流的检测精度。仿真结果验证了这两种方法的有效性。

Two methods based on space vectors for harmonic detecting are proposed. The first one is the open loop detecting method, in which the fundamental positive sequence space vector on complex plane is detected by low-pass filters and integral phase shifters, and the fundamental positive sequence currents and harmonic currents of the three-phases can be obtained through compensating the phase shifts caused by low-pass filters. The second method is a space vector based adaptive closed loop detecting method, which can eliminate the error caused by parameter changing of the compensation circuit in the open loop detecting method, because the adaptive algorithm continuously modifies the filter parameters and makes the filter operate on the best state. Theoretical analysis and simulation results show the validity and correctness of the proposed methods.