UPQC中串联逆变器的控制研究  

Research on Series Inverter of UPQC

作　　者：李强 李晓莉[2] 

机构地区：[1]中铁21局电务电化公司,兰州730030 [2]兰州交通大学自动化与电气学院,兰州730070

出　　处：《电子器件》2013年第2期217-220,共4页Chinese Journal of Electron Devices

摘　　要：尽管稳态时的统一电能质量控制器(UPQC)直流侧平均电压保持在设定值,但在负载连接、断开或电源电压跌落、上升的瞬间,直流侧电压明显偏离其参考值。由于在此瞬间的直流侧电压偏差相当大而造成串联逆变器的注入电压不能恒定且影响负载侧电压幅值。对串联补偿器进行一种改进的正弦脉宽调制(SPWM)电压控制方法,通过不断调整调制深度来应对直流侧电压偏差。通过仿真验证了所提控制方案的有效性。Despite the fact of that the dc link voltage of the Unified Power Quality Controller（UPQC） is maintained at the set value in the steady state, during the load connected/disconnected or power supply voltage sag/swell, dc link voltage deviates significantly from the reference value. In this moment, the large dc link voltage deviation causes the series injected voltage not constant and has an effect on the load voltage amplitude. An improved sinusoidal pulse width modulation（SPWM） voltage control method puts forward for the series inverter. It continuously adjusts the modulation ratio to deal with dc link voltage deviation. The simulation results show that the proposed control scheme is effective.

关 键 词：统一电能质量控制器 电压跌落、上升 正弦脉宽调制 调制深度 

分 类 号：TM464[电气工程—电器]