链式静止无功发生器直流侧电压稳定性分析  

DC Side Voltage Stability Analysis of Cascaded Static Var Generator

作　　者：熊桥坡[1] 罗安[1] 王晓[2] 黎小聪[1] 马伏军[1] 肖华根[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 [2]湖南省电力公司检修公司,湖南省长沙市410041

出　　处：《电力系统自动化》2014年第3期25-29,共5页Automation of Electric Power Systems

基　　金：国家自然科学基金重点资助项目(51237003);国家高技术研究发展计划(863计划)资助项目(2011AA05A301)~~

摘　　要：链式静止无功发生器(SVG)直流侧电容电压存在二倍频波动,电压检测时常采用滤波电路对直流侧电压信号进行调理。文中重点研究了滤波环节对链式SVG直流侧电容电压稳定性的影响。根据能量平衡的思想对链式SVG直流侧电压控制进行了建模,建立包含滤波环节的系统闭环模型,并进行稳定性分析,得到调节器积分时间常数大于滤波环节时间常数是系统稳定的必要条件。搭建了13电平SVG样机,在220V和3kV电压下分别进行了并网实验,实验结果验证了文中稳定性分析的正确性。There exists 100Hz ripple in the DC side capacitor voltage of the cascaded static var generator（SVG）,and the filter circuit is often used in the detection of DC side voltage.Mainly the effect of the filter circuit on the stability of the DC side voltage is studied.The DC side voltage closed-loop control model containing the filter circuit is established according to the principle of the energy balance.An analysis of the stability of the control model shows that the necessary condition for the robust stability of the system is to obtain the regulator integral time constant greater than the filter time constant.A 13-level SVG experimental prototype is built.Experimental results under 220 Vand 3 000 Vvoltage respectively have verified the correctness of the stability analysis.

关 键 词：级联型多电平逆变器 静止无功发生器 直流侧电压稳定控制 稳定性分析 根轨迹法 

分 类 号：TM761.1[电气工程—电力系统及自动化] TM714.2