一种提高星接链式STATCOM直流融冰电流的控制方法  

A Control Scheme to Increase DC Ice-melting Current Value with Star-connected Cascaded STATCOM

作　　者：沈力[1,2] 董亮[1] 侯凯[1] 何思源[1] 王皓[1] 张辉[1] 

机构地区：[1]南瑞集团公司(国网电力科学研究院),江苏省南京市211106 [2]南京南瑞继保电气有限公司,江苏省南京市211102

出　　处：《电力系统自动化》2016年第17期184-189,共6页Automation of Electric Power Systems

基　　金：国家电网公司科技项目(GWKJ20140087);江苏省自然科学基金资助项目(BK20140118)~~

摘　　要：分析了采用中性点相连的两台星接链式静止同步无功补偿器(STATCOM)的直流融冰方案中融冰电流较小的问题,最终提出了调制波饱和的控制方法,即增大直流调制波幅值,使得总的调制波饱和,从而提高每相H桥直流电压利用率、产生更大的融冰电流;同时理论论证了使用调制波饱和的控制方法而产生的谐波分量只会在两台STATCOM间形成环流而不会流入污染系统。最后在Matlab/Simulink环境下搭建仿真,证实了该方法的可行性和有效性。First an analysis is made of the causes of limiting DC ice-melting current values in the DC ice-melting method with two star-connected cascaded static synchronous compensators（STATCOMs）whose neutral points are connected.Then a new method of saturated modulation control is proposed to increase the DC bias till the modulated wave is saturated.Thus,the Hbridge DC voltage utilization is improved,resulting in greater ice-melting current.It is shown that despite the harmonics generated,the harmonic components will be kept from flowing into the power system by using the saturated modulation control method.Finally,the feasibility and effectiveness of the theory is verified by simulation results in Matlab/Simulink environment.

关 键 词：直流融冰 静止同步无功补偿器(STATCOM) 调制波饱和 

分 类 号：TM752[电气工程—电力系统及自动化]