三相四线制APF电流检测方法的研究

A Research on Three-phase Four-wire APF Current Detection Methods

我国低压线路大多采用的是三相四线制有源电力滤波器(APF),针对时常因零线引发事故的现象,提出了p-q-o、ip-iq、dq-o等三种用于四线制APF的电流检测方法,使APF不仅可以补偿谐波与无功电流,而且还可以补偿中线电流。并分别建立了MATLAB/Simulink仿真模型。通过对理论和仿真结果的对比分析,得出对于三相电压不对称且有畸变的APF的谐波电流的检测精度最高的是d-q-o法。而p-q-o法只能用在电压对称且无畸变的APF中,ip-iq只能用于对称的APF中。

Three-phase four-wire APF （ active power filter） is commonly used on low-voltage lines in China. In view of frequent accidents due to zero line, this paper presents three current detection methods for four-wire APF ：p-q-o, ip-iq and d-q-o which enables APF not only to compensate for harmonic and reactive current, but also for neutral current. MATLAB/simulink models are established respectively. Through comparative analysis of the theoretical and simulation results, it is concluded that the d-q-o method can achieve the highest accuracy in the detection of the harmonic current of the APF with asymmetric three-phase voltage and distortion, while the p-q-o method is only applicable to the APF with voltage symmetry and no distortion and the ip-iq method is only suitable for the symmetric APF.