级联型SVG双闭环控制稳定性分析  

Stability Analysis of Double Closed Loop Control for Cascaded Static Var Generator

作　　者：刘雷[1] 罗安[1] 熊桥坡[1] 黎小聪[1] 刘爱文[1] 刘奇[1] 

机构地区：[1]国家电能变换与控制工程技术研究中心(湖南大学),湖南省长沙市410082

出　　处：《电网技术》2013年第12期3356-3361,共6页Power System Technology

基　　金：国家重点基础研究发展计划项目(973计划)(2009CB 219706);国家自然科学基金重点项目(51237003)~~

摘　　要：介绍了单相级联型静止无功发生器(static var generator,SVG)的原理与控制系统结构,采用光纤隔离检测技术进行级联单元直流侧电压的测量。考虑光纤隔离检测延时,建立了基于瞬时能量平衡的直流侧电压外环控制数学模型,得到了基于比例积分(proportional integral,PI)控制的传递函数,并进行了电压外环稳定性分析;建立了基于比例(proportional,P)控制的电流内环离散控制模型,分析得到其在离散域内稳定控制的充要条件。样机实验结果验证了所提稳定性分析方法的正确性。The principle of single-phase cascaded static var generator （SVG） and the structure of its control system are presented, and the optical fiber isolation test technology is utilized to measure the voltages at DC sides of cascaded units. Considering the time-delay of optical fiber isolation, an instantaneous energy balance based mathematical model of outer-loop control for voltage at DC side is established, and the stability of voltage outer-loop is analyzed; a proportional control based discrete control model of current inner-loop is established and through analysis the necessary and sufficient condition for its stable control within the discrete domain is obtained. Test results of a 13-level cascaded prototype show that the proposed stability analysis method is correct.

关 键 词：单相级联型SVG 双闭环控制 光纤隔离检测 劳斯稳定判据 波特图 …_-L 

分 类 号：TM100[电气工程—电工理论与新技术]