串联型电能质量补偿器的控制策略

随着配电系统中各类非线性负荷的不断增加,特别是电力电子装置的广泛应用,系统中电能质量日益恶化,对大量应用计算机系统的重要用户进行电能质量的有效补偿已显得越来越迫切。因此,有必要对串联型电能质量补偿器(SPQC)的控制方法进行改进,以达到改善系统电能质量的目的。本文探讨了SPQC的一种控制方法及其实现,并结合SPQC实验装置的研制工作,分析了装置的工作原理、硬件结构和检测控制策略。其方法是:串联侧采用基于瞬时无功功率理论的畸变电流瞬时控制方法,即瞬时空间矢量法,获得所希望的补偿电压指令值;并联侧采用滞环比较直接电流控制法,使实际输入电流跟踪补偿指令值。实验结果表明,该系统有效地抑制了3,5,7次电网谐波。电网电压经SPQC补偿后,基本上消除了谐波成分,达到了预期效果。

Control Method and Implementation of SPQC

Along with the increment of different kinds of nonlinear loads,and especially the wide application of power electric equipment in distribution system,power quality becomes more and more deteriorated.The desire for effectively solving power quality problems of important customers with many computer applications is also more urgent.Therefore,it is essential to make improvement in the control method of Series Power Quality Compensator (SPQC) to ameliorate the power quality.This paper explored a control method and implementation of SPQC.Based on the research of SPQC,the paper discusses the operation principle,hardware configuration,and the strategy of detection and control.The control strategy of series side adopted the method based on instantaneous reactive power theory,namely instantaneous space vector,to obtain expected compensated voltage instruction value.The method of direct current control with hysteresis compare was taken as the control strategy of shunt side to make the factual AC input current following up the compensate instruction value.At last of the paper,the test indicates,the 3rd,5th and 7th harmonic waves are rejected effectively using this system.The harmonic waves of voltage are eliminated and the expected effect is attained.