基于Simulink的基波电流提取算法仿真与分析

Simulation and Analysis of Fundamental Current Extraction Algorithm based on Simulink

针对大量非线性负荷接入电网所产生的谐波问题,以瞬时无功功率理论为基础,对p-q法和i_p-i_q法进行了理论分析,理论推导了两种方法在电压无畸变和有畸变情况下基波电流提取的准确度。在此基础上分别搭建了基于p-q法和i_p-i_q法的Simulink仿真模型,结果表明i_p-i_q法在两种情况下都能准确提取基波电流,而p-q法在电压畸变情况下会产生误差,验证了理论分析的正确性。

With large number of nonlinear loads connected to the grid, harmonic pollution has become an increasingly serious problem. This paper analyzes the theory of p-q method and ip-iq method based on instantaneous reactive power theory. Results of analysis reflect the difference of the two methods on accuracy of fundamental currents extraction with or without voltage distortion. Simulation models of p-q method and ip-iq method are established respectively on Simulink. Research results show that ip-iq method can accurately detect fundamental currents in both two cases. However, p-q method has significant error when there is voltage distortion. The experimental results validate the theoretical analysis.