链式STATCOM电容电压不平衡现象研究(一)仿真和试验  

RESEARCH ON THE VOLTAGE UNBALANCE OF DC CAPACITORS OF CASCADE STATCOM Part One Simulations and Experiments

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16期53-57,86,共6页Automation of Electric Power Systems

摘　　要：由于链式静止同步补偿器 (STATCOM )直流电容器各自独立 ,如何使这些电容器上的电压保持一致 ,是装置安全可靠运行需要解决的关键问题。而电容电压不平衡机理的研究则是制定电压平衡控制策略的基础。文中通过数字仿真和物理模型试验进行相互比较 ,研究了各种因素对电容电压分配的影响 ,指出开关脉冲延时不同、混合型损耗差异以及并联型损耗差异是造成电容电压不平衡的主要原因。其研究结果对于建立链式STATCOM数学模型 ,从而定量分析电容电压的不平衡程度 。Since DC capacitors of cascade STATCOM are separate, their voltage may not be exactly balanced during operation periods. However, the mechanism of this kind of voltage unbalance has not been explained clearly up to now. Several factors are considered and discussed including switching loss, parallel loss, and time delay of gate pulse, and while simulations and experiments show that the slight differences of these inverters' parameters are the main causes of voltage unbalance. The conclusion is very important in the succeeding analysis and research for modeling of cascade STATCOM and 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 仿真 

分 类 号：TM761.1[电气工程—电力系统及自动化]