基于三次谐波注入的SVG控制策略研究  

Research on a Control Strategy for SVG Based on Third Harmonic Injection

作　　者：魏星[1] 王翀[1] 盛晓东[1] 李钊[1] WEI Xing;WANG Chong;SHENG Xiao-dong;LI Zhao(NR Electric,Nanjing 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《电力电子技术》2018年第10期68-71,共4页Power Electronics

基　　金：国网电力科学研究院有限公司/南瑞集团有限公司科技项目(BW1700190)~~

摘　　要：H桥级联星形静止无功发生器(SVG)通常采用传统的载波移相正弦脉宽调制(SPWM)技术,存在直流电压利用率不高,电网过压过高时存在过调制的问题。将3次谐波注入法引入H桥级联星形SVG,可有效提高直流电压利用率,但输出电流将出现特征次谐波,为此提出了专用的输出谐波电流抑制策略。通过整机实验,有效验证了所提控制策略不仅可以提高直流电压利用率还可以抑制由此带来的输出谐波电流问题。The traditional carrier phase-shifting sinusoidal pulse modulation（SPWM） technique can always be used for the star connection cascaded H-bridge static var generator（SVG） with the problem of low DC voltage availability and over modulation during high system voltage.The third harmonic injection method is proposed into the star connection cascaded H-bridge SVG.This method can improve the DC voltage availability,but output current will be involved by specific number of harmonic and a dedicated harmonic current suppression strategy is proposed.Through power experi- ment, the dedicated control strategy is verified to be correct and effective.

关 键 词：静止无功发生器 谐波注入法 谐波电流抑制 

分 类 号：TM761[电气工程—电力系统及自动化]