级联多电平STATCOM直流侧电容电压稳定性分析  

DC capacitor voltage stability analysis for cascade multilevel STATCOM

作　　者：谢天才[1] 张玉娟[1] 张君泉[2] 王众全[2] 

机构地区：[1]国网辽宁省电力有限公司朝阳供电公司,辽宁朝阳122000 [2]积成电子股份有限公司,山东济南250100

出　　处：《机电工程》2016年第8期1016-1020,共5页Journal of Mechanical & Electrical Engineering

摘　　要：针对级联多电平静止同步补偿器(STATCOM)各独立直流侧电容电压易失衡的问题,为保证STATCOM中各级联单元电容电压的稳定性,提出了一种直流侧电容电压检测与控制方法。首先,分析了电网无功功率交换对直流侧电容电压的影响。然后,基于能量平衡原理,建立了级联多电平STATCOM能量平衡模型同时采用PI闭环控制方法以解决滤波电路的延时问题,并进行了稳定性分析。最后,搭建了多电平级联STATCOM实验样机,并进行了实验研究。研究结果表明:该控制系统和方法可以保证直流侧电容电压的稳定性;积分时间常数T_(di)对系统稳定性的影响较大,与理论分析结果相符。Aiming at the problem of the imbalance among each independent DC capacitor voltage of cascade multilevel STATCOM,a DC capacitor voltage detection and control method is proposed to guarantee the DC capacitor voltage stability of cascade multilevel STATCOM.Firstly,the influence caused by grid reactive power exchange on DC capacitor voltage is analyzed. Then,a cascade multilevel STATCOM energy balance model is established based on energy balance principle. At the same time,a PI closed-loop control method is adopted to solve the problem of filter circuit time-delay,and a stability analysis is also carried out. Finally,the multilevel cascade STATCOM experimental prototype is set up and relevant experiments are conducted. The results indicate that this control system and method can guarantee the stability of DC side capacitor voltage and the stability is mainly influenced by the integral time constant Tdi,consistent with the theoretical analysis results.

关 键 词：静止同步补偿器 级联多电平逆变器 直流侧电容 电压稳定控制 

分 类 号：TM76[电气工程—电力系统及自动化]