改进的单相电路谐波及无功电流检测方法

Improved Method for Detecting Harmonics and Reactive Currents in Single-phase Circuit

为了实时、准确地检测单相电路的谐波和无功电流,分析了基于平均有功功率检测法的基本原理,考虑到该检测方法需要低通滤波器提取直流分量,为解决由此造成的延时,针对该方法提出一种改进方法,将谐波及无功电流作为反馈信号,引入含比例-积分-微分调节的反馈环节来加快其检测速度。最后利用Matlab/simulink做仿真研究,验证了改进的方法更具快速性。

In order to detect harmonics and reactive currents of the single-phase circuit real-timely and accurately, the principle on the detecting method based on average power theory was analyzed. Considering the detection method which requires the low-pass filter, an Improved method was proposed to solve the resultant delay caused by the low-pass filter, the harmonic and reactive current was made as the feedback signal to introduce feedback loop with the PID regulation as well as to accelerate its dynamic response. Finally, Matlab/simulink is used for simulation studies, the improved method is verified to be still more rapid.