| 星形链式SVG负序补偿特性及控制策略 |
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| 引用本文： | 熊桥坡,罗安,曾智桢.星形链式SVG负序补偿特性及控制策略[J].变流技术与电力牵引,2013(5):44-49. |
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| 作者姓名： | 熊桥坡 罗安 曾智桢 |
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| 作者单位： | [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 |
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| 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。
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| 关 键 词： | 链式SVG 星形连接 负序补偿 中性点偏移 |
Characteristics and Control Strategy of Cascaded SVG with Star-configuration Considering Negative-sequence Compensation |
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| XIONG Qiao-po,LUO An,ZENG Zhi-zhen.Characteristics and Control Strategy of Cascaded SVG with Star-configuration Considering Negative-sequence Compensation[J].Converter Technology & Electric Traction,2013(5):44-49. |
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| Authors: | XIONG Qiao-po LUO An ZENG Zhi-zhen |
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| Institution: | 1. National electric power conversion and control engineering technology research center, Hunan University, Changsha, Hunan 410082, China; 2. Zhongnan Engineering Corporation, Hydro China, Changsha, Hunan 410014,China ) |
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| Abstract: | 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. |
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| Keywords: | cascaded SVG star-configuration negative sequence compensation neutral shift |
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