星形链式SVG负序补偿特性及控制策略  

Characteristics and Control Strategy of Cascaded SVG with Star-configuration Considering Negative-sequence Compensation

作　　者：熊桥坡[1] 罗安[1] 曾智桢[2] 

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),湖南长沙410082 [2]中国水电顾问集团中南勘测设计研究院,湖南长沙410014

出　　处：《大功率变流技术》2013年第5期44-49,共6页HIGH POWER CONVERTER TECHNOLOGY

摘　　要：阐述了星形链式SVG进行无功和负序综合补偿的工作原理,对补偿器零序电压分量进行了数学推导,发现该分量受输出电流无功分量与负序分量比值的影响。补偿器负序补偿能力受到链节输出电压的限制,为此提出一种改进的电压电流双闭环控制策略:1、限制指令电流负序分量;2、在电压调制信号中注入零序分量。最后通过仿真验证了所提控制策略的有效性。This paper illustrated vat and negative sequence comprehensive compensation principles of cascaded static var generator（SVG） with star-configuration. The mathematical expression of zero-sequence voltage was deduced, and subsequently zero-sequence voltage was found to be affected by the ratio of output current＇s reactive component to negative-sequence component. The negative-sequence compensative capability of SVG is limited by the output voltage, therefore, an improved voltage/current double closed-loop control strategy suitable for starconfiguration cascaded SVG was proposed： 1.Limiting the negative sequence component of reference current; 2.Injecting zero-sequence component to voltage modulation signals. The effectiveness of proposed control strategy was verified by simulations.

关 键 词：链式SVG 星形连接 负序补偿 中性点偏移 

分 类 号：TM761.1[电气工程—电力系统及自动化]