民用电网谐波电流检测方法及仿真研究

针对民用电网中存在的电压不稳、三相不平衡和中线电流大等问题,在传统的ip-iq法基础上,采用对称分量法和零序电流分离法研究电流中的零序分量问题,并结合PI调节器建立数学模型对其谐波、基波负序和零序电流进行了实时检测。结果表明,该方法可准确地检测出电网电流中含有的谐波、基波负序和零序电流,且检测精度高、实时性好。

Detection and Simulation of harmonic current in civilian power grid

In light of the problems of voltage instability, three phase imbalance and big neutral current in civilian power grid, this study, on the basis of the traditional ip-iq method, used the symmetrical component method and the zero sequence current separation method to study zero sequence component problems in the current. Aided by PI regulator, it established a mathematical model to detect real time the harmonic current, fundamental negative sequence, and zero sequence current in the civilian power grid. Simulation results with the MATLAB software show that this method can accurately de- tect the grid current containing harmonics, fundamental negative sequence and zero sequence current and boast high precision and good real time.