链式STATCOM电容电压不平衡现象研究(二)数学模型  

RESEARCH ON THE VOLTAGE UNBALANCE OF DC CAPACITORS OF CASCADE STATCOM Part Two Mathematical Model

作　　者：耿俊成[1] 刘文华[1] 袁志昌[1] 

机构地区：[1]清华大学电机系,北京市100084

出　　处：《电力系统自动化》2003年第17期35-39,共5页Automation of Electric Power Systems

摘　　要：电容电压不平衡及其控制是链式静止同步补偿器 (STATCOM)安全可靠运行必须解决的关键问题。文中建立了链式STATCOM的数学模型 ,揭示了电容电压不平衡现象产生的机理 ,正确描述了逆变桥各参数对电容电压分配的影响。基于PSCAD的仿真验证了模型的正确性。To keep the DC capacitors' voltage balance is very important for the reliable operation of cascade STATCOM since DC capacitors of cascade STATCOM are separate. This paper presents a mathematical model to study the mechanism of the happened voltage unbalance. Further more, the impacts of inverter's parameters on the distribution of capacitors' voltage are investigated. Simulations verify the correctness of this model and the conclusion has significant contribution to designing controller to balance the voltages.

关 键 词：静止同步补偿器 链式多电平逆变器 电容电压不平衡 数学模型 

分 类 号：TM761.12[电气工程—电力系统及自动化]