链式SVG直流侧电压分层控制策略的研究  

A Hierarchical Control Strategy of DC Line-side Voltage for Chain SVG

作　　者：赵国生[1] 路向东[1] 刘楷[2] 

机构地区：[1]郑州大学电气工程学院 [2]郑州大学信息工程学院,郑州450001

出　　处：《电测与仪表》2014年第9期45-49,72,共6页Electrical Measurement & Instrumentation

摘　　要：链式静止无功补偿装置(SVG)对于提高电网的安全稳定有着巨大的意义,其中便于模块化的链式结构给扩展SVG容量带来了很大的方便,但是结构中分散的直流侧电压却难以控制。根据双闭环控制理论,使内环电流控制实现了无功电流的实时准确跟随;外环直流电压控制不仅分相控制了单相的总体电压水平,而且根据各路的调制波信号控制了单个功率单元电压水平,从而实现了外环的分层控制策略。在Matlab/Simulink下,以2kV电压等级为例,对每相三功率单元串联的三相系统进行了仿真,通过仿真实验验证了SVG的补偿效果以及控制系统的可靠性。The chain static reactive compensation device（ SVG） is of great significance for enhancing the security and stability of the power grid. The chain structure that is facilitated to be modulated has brought great convenience to capacity expanding of the SVG. but the scattered DC line-side voltage control is difficult to achieve. Based on the double closed-loop control theory,this study enabled the inner current control to follow the reactive current accurately and in real-time. And the hierarchical control of the outer ring was realized,under which the outer DC voltage control not only controlled the general voltage level of the single phase in individual phase control,,but also controlled the voltage level of each power unit according to various modulation waves.. Under the environment of Matlab / Simulink, taking the 2kV voltage level for example,the paper simulated the three-phase system with the power unit of singlephase three series,and the simulation results verified the compensation effect of the SVG and the reliability of the control system.

关 键 词：链式 静止无功补偿装置 双闭环控制 分层控制 

分 类 号：TM93[电气工程—电力电子与电力传动]