链式SVG直流侧电压分层控制策略-电测与仪表.doc

链式SVG直流侧电压分层控制策略的研究 赵国生，路向东，刘楷（郑州大学，.电气工程学院；.信息工程学院，郑州 450001） 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。本文根据双闭环控制理论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。 关键字：链式；静止无功补偿装置；双闭环控制；分层控制 图分类号: TM93 文献标识码：A 文章编号：1001-1390（2014）09-0000-00 A Hierarchical Control Strategy of DC Line-side Voltage for Chain SVG ZHAO Guo-sheng1, LU Xiang-dong1，LIU Kai(Zhengzhou University, 1.School of Electrical Engineering, 2.College of Communication Engineering, Zhengzhou 450001,China) Abstract: 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 single-phase three series, and the simulation results verified the compensation effect of the SVG and the reliability of the control system. Key words: chain, static reactive compensation device, double closed-loop control, hierarchical control. 0 引言 随着电力工业的不断发展现代电网的功率需求发生着巨大的变化，其中冲击性的负荷日益增加。这些负荷常常启动过程快，启动频率高，吸收大量的动态无功功率，引起了电网电压的波动。静止无功补偿装置（SVG）以其能够动态、快速、实时补偿无功的优势越来越受到国内外学者的关注。特别是链式SVG，因其结构简单，易于模块化、标准