电网谐波和无功电流检测的一种新方法  

A New Detection Method for Harmonics and Reactive Currents

作　　者：王洋 盛吉[2] 

机构地区：[1]江苏省镇江市供电公司配电运检中心,江苏镇江212013 [2]江苏大学电气信息工程学院,江苏镇江212013

出　　处：《电测与仪表》2011年第2期10-14,20,共6页Electrical Measurement & Instrumentation

摘　　要：以瞬时无功功率理论为基础,提出了一种改进的实时检测谐波电流方法:在低通滤波器(LPF)之后加入PI调节器,提高了谐波电流检测的精度;引入了比例微分环节PD作为负反馈,以补偿低通滤波器的延时,加快了检测的动态响应速度;采用无锁相环(PLL)技术,消除由于锁相环而产生的相移偏差。通过与传统方法进行仿真比较,证明了这种改进检测方法的正确性。Based on the instantaneous reactive power theory, a novel method for real time harmonic current detection is presented. Adding a PI regulator after low pass filter （LPF） improves harmonic current detection precision. To make the dynamic response speed of detection quicker, the PD negative feedback is proposed, which can compensate the in- herent delay of LPF. The excursion error of phase is eliminated by using a technology without the phase - locked - loop （PLL）. By simulation of MATLAB, the new method is proved to be able to improve the accuracy of harmonic current detection and meet the request of dynamic compensation.

关 键 词：电流检测 PI调节器 PD环节 锁相环 

分 类 号：TM933[电气工程—电力电子与电力传动]