改进的基于平均有功功率的谐波电流检测方法

Improving Detecting Method for Harmonics Based on Average Power Theory

为实时、准确地检测出单相电路谐波电流,本文对基于平均有功功率的单相电路谐波电流检测方法进行了分析。原有的平均有功功率谐波检测方法采用低通滤波器提取直流分量,由于低通滤波器具有固有延时,影响检测的实时性。为解决此问题,本文采用将低通滤波器和均值滤波器串联的形式对原有的低通滤波器进行优化,缩短了由低通滤波器造成的固有延时,并提高了检测精度;同时引入谐波电流反馈,进一步加快响应速度。最后通过Matlab/Simulink仿真,验证了改进方法的正确性。

In order to detect the single-phase harmonic current in real-time and accurately,the harmonic current detection method based on the average active power of single-phase circuit is analyzed in this paper.The original active power harmonic detection method uses the low pass filter to extract the DC component, but the low pass filter has the inherent delay,which impact the real-time of detection .To solve this problem. ,this paper connect the low-pass filter and mean value filter in series to optimize the original low-pass filter,shorting the inherent delay caused by low-pass filter and improving the detection accuracy,at the same time,introduce the harmonic current feedback to further speed up the response rate.Finally,the correctness of the improved method is verified by Matlab/ Simulink simulation.