摘要
有源电力滤波器是用于对电力系统谐波、无功及负序电流进行动态综合补偿的装置,其中的畸变电流检测电路是决定补偿性能好坏的重要环节。本文首先阐述了基于瞬时无功功率理论的ip-iq法基本原理。在此基础上,提出了一种无锁相环(PLL)的ip-iq畸变电流检测法,可以消除由于PLL而产生的相移偏差。理论分析和MATLAB仿真结果均表明,在三相负载对称或不对称的情况下,改进后的ip-iq法能更准确地检测出三相畸变电流,验证了该方法的有效性和优越性。
Active power filter is a kind of device used for instantaneous integrated compensation of harmonics, reactive and negative sequence current of power system. The distortion current detecting circuit is an important part of active power filter that determines its compensating characters. In this paper, basal principle of methods of ip-iq is expatiated based on theory of instantaneous reactive power. On the basis of it, an non-PLL ip-iq method of distortion current detection is presented, which can avoid excursion error of phase due to PLL. The results of theoretical analysis and MATLAB simulation indicate the improved iv-iq method can precisely detect the three-phase distortion current in the balanced or unbalanced three-phase load condition, which proves the validity and superiority of the method further .
出处
《电测与仪表》
北大核心
2005年第11期5-8,共4页
Electrical Measurement & Instrumentation
