改进的谐波和无功电流检测方法

三相电压不对称时,由于A相正序电压与A相电压存在相位差,使传统ip-iq法检测的无功电流有误差,同时低通滤波器的存在使得检测产生延时,因此,文中提出了一种改进的ip-iq无功电流检测法。该改进法利用延时法来快速获取A相电压的正序分量,然后利用正序基波提取器获得电流正序基波信号,省去了滤波器环节。文中利用了Matlab/Simulink仿真软件进行建模仿真,仿真结果表明,该改进法在三相电网电压不对称时能准确、实时地实现谐波和无功电流的检测。

Improvement of Harmonic and Reactive Current Detection Method

For three-phase system, in the case of asymmetrical three-phase voltage, the phase-lock loop in the traditional ip-iq detecting method cannot be used to detect the phase of the positive sequence voltage. At the same time, present in real-time low-pass filter such that the detected poor. As a result, there exist errors in the transient reactive currents. To solve this problem, an improved detecting method is put forward in this paper. In this method, the improvedSmethod toSobtainSthe positive sequence componentSA phaseSvoltage by usingStime delay method. Meanwhile, use the wave of positive sequence extractorSinstead of low-pass filter to attain the DC component of current.Seliminating theSfilterSlink. In this paper, using the MATLAB/SIMULINK simulation software for modeling and simulation, the simulation results show that the improved reactive current test in the asymmetric three-phase grid voltage can accurately, real-time implement reactive current detection used in the static reactive power generator.