链式STATCOM直流侧电容电压平衡控制  

Voltage balance control of DC side capacitor of cascade STATCOM

作　　者：郭高朋[1] 许留伟[1] 江加福[1] 

机构地区：[1]中国科学院等离子体物理研究所,安徽合肥230031

出　　处：《电源技术》2012年第1期104-107,共4页Chinese Journal of Power Sources

摘　　要：由于链式STATCOM直流侧电容器相互独立,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。从能量的角度,通过研究链式STATCOM直流侧电容的电压变化过程,解释了电容电压不平衡现象产生的机理。通过simulink进行了仿真验证。另外,还研究了开关脉冲循环换位对直流侧电容电压不平衡的抑制作用,但是当STATCOM链节单元的并联损耗不同时,开关脉冲循环换位就不能够抑制电容电压不平衡。提出了开关脉冲排序换位的方法,即使STATCOM链节单元损耗不同,也能够使电容电压趋于平衡。仿真结果表明,开关脉冲排序换位能够有效地抑制电容电压不平衡。Because the cascade STATCOM DC side capacitor is separate,so keeping the voltage of these capacitor balanced is very important.In the energy point of view,the voltage change process of the cascade STATCOM DC side capacitor was studied,and the mechanism of the unbalanced capacitor change was explained.Otherwise,the gate pulse rotated transposition was studied,which could restrain the unbalance of the capacitor voltage.But when the wastage of the STATCOM unit was not the same,the gate pulse rotated transposition could not restrain the unbalance of the capacitor voltage.In order to avoid this problem,the gate pulse sort transposition was put forward.Especially,when the wastage of the STATCOM unit was not the same,this method could also keep the capacitor voltage balanced.The result of the simulation shows that： gate pulse sort transposition can keep the capacitor voltage balanced,when the wastage of the STATCOM unit is not the same.

关 键 词：电力电子 静止同步补偿器(STATCOM) 链式多电平逆变器 开关脉冲循环换位 开关脉冲排序换位 

分 类 号：TM464[电气工程—电器]