改进的单位功率因数谐波电流实时检测方法

为较好地解决低通滤波器的延时问题，分析了低通滤波器和积分器对谐波电流检测精度和检测响应过程的影响，采用移动窗积分法改进了单位功率因数谐波电流检测法的暂态性能，提出了改进的单位功率因数谐波电流实时检测方法。Matlab/Simulink仿真结果表明该方法提高了传统检测方法的实时性，可较好地跟踪负载的变化。基于数字信号处理器的并联有源滤波器实验验证了该方法的可行性和有效性。

Modified Unity Power Factor Harmonic Current Real-time Detection Method

To improve the time lag of low-pass filter(LPF),the influences of both low-pass filter and integrator on the accuracy of harmonic current detection and response during the detection are analyzed.Adopting slipped-window integrator to substitute conventional low-pass filter,modified technique of measuring multiple load conductance k in UPF harmonic current detection is presented,so the time lag of LPF is solved as well as the transient performance of unity power factor(UPF) harmonic current detection method is modified,thus a corresponding detection method is proposed.Simulation results by Matlab/Simulink show that the proposed method can enhance the real-time performance of traditional detection method and the variation of load can be traced better.The feasibility and effectiveness of the proposed method are verified by experiments in which the digital signal processor(DSP) based parallel active filter is used.