基于电流平均值法的任意次谐波电流检测

实时准确地检测出谐波电流是有源电力滤波器(APF)的重要环节。通过改进电流平均值法的积分周期,使其可用于ip,iq法的三相电路任意次谐波电流检测。为验证该改进方法的正确性,分别利用LabVIEW进行了实验研究。研究结果表明,该改进方法不仅克服了电流平均值法只能用于三相电路基波电流检测的局限,而且与传统ip,iq法中采用的低通滤波器相比,具有更快的响应速度,稳定的过渡时间。该改进方法检测准确,原理简单且易于实现,具有较强的实用性。

A new Current Average Method of Detecting Random Harmonics

A reformative ip,iq method is presented and applied for random harmonic current detection with the current average method in three-phase circuit,which conquers the localization that the conventional average method can only be used in the fundamental current detection in three-phase circuit.In addition,it produces a faster dynamic response than conventional ip,iq principle using filters,so it has essential practicality value. The presented method is easy realization and has a high precision.The experimental and simulative results prove the correctness of the reformative method.