摘要
配电网静止同步补偿器(D-STATCOM)直流侧电容电压在电网电压不平衡条件下会出现2倍频波动,使得交流输出电压出现负序和3次谐波,严重影响D-STATCOM的运行性能。针对此问题,提出一种综合应用改进开关函数调制法和负序电压前馈控制的方法改善D-STATCOM的运行性能。改进的开关函数法能有效抑制3次谐波电流,改善了D-STATCOM的电压输出性能;负序前馈控制抑制了D-STATCOM因负序电压分量造成的过流,保障了装置的安全可靠运行。仿真和实验结果表明,提出的该方法是行之有效的。
Under unbalanced voltage of power system, the influence on voltage output performance of distribution network static synchronous compensator （D-STATCOM） was analyzed. Twice frequency waves occurred in voltage of capacitor at DC side of D-STATCOM under unbalanced voltage, which results in negative sequence and 3 times harmonics in AC voltage, therefore, an improved switching function modulation was proposed to improve voltage output performance of D-STATCOM and to suppress 3 times harmonic current. An unbalanced control strategy of feed-forward control for negative sequence voltage was also carried out to suppress converter overcurrent caused by negative voltage in order to make D-STATCOM safe. The feasibility of the proposed method was proved by simulation results.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2009年第10期2498-2502,共5页
High Voltage Engineering
基金
湖南省自然科学基金(07JJ6081)~~
关键词
配电网静止同步补偿器
电网电压不平衡
运行性能
改进开关函数调制法
负序电压前馈控制
控制策略
D-STATCOM
unbalanced voltage of power system
operation performance
improved switching function modulation
feed-forward control for negative sequence voltage
control strategy
