一种滤波换相换流器工作机理与稳态模型  

Operation Mechanism and Steady State Model of Filter Commutated Converter in HVDC System

作　　者：李季[1] 罗隆福[1] 许加柱[1] 李勇[1] 张杰[1] 刘福生[1] 

机构地区：[1]湖南大学电气与信息工程学院,长沙410082

出　　处：《电工技术学报》2008年第8期53-59,共7页Transactions of China Electrotechnical Society

摘　　要：提出了一种新型滤波换相换流器(FCC)的拓扑电路结构,阐述了FCC的工作机理,引入了阀侧无功功率补偿度概念。考虑到FCC的接线方案较为特殊,本文以多绕组变压器理论为基础,结合基尔霍夫定律和端口电压、电流方程,求得FCC阀侧端口电压方程和换相电抗的计算公式,进而将FCC电路结构转化为等效、简易的Graetz桥电路,建立其稳态数学模型。直流输电研究开发平台被用于验证该稳态模型,实验结果与理论分析值相吻合,为后续研究FCC的各种运行特性和新系统的稳定性分析提供了重要理论依据,同时表明FCC的滤波效果良好,能有效降低换流变压器的损耗和噪音,增强系统稳定性,具有很好的工程应用前景。This paper presents a new-type circuit configuration of converter which is called filter commutated converter （FCC）. The operating principle of FCC is described and the concept of reactive power compensation degree is introduced. Taking the particularity of the connection scheme of FCC into account, the port voltage equation and commutated reactance calculation formula are obtained based on the theory of multi-winding transformer, Kirchhoff＇s law and port voltage and current equations. As a result, the FCC structure could be converted into the equivalent circuit model of Graetz bridge. A DC transmission exploitation platform is used to verify the correctness of steady state model. Simulation results and experiment data agree well with each other. It provides important theoretic foundation for the further research on the steady and transient characteristics analysis of the FCC and its fluencies to the HVDC system. The results also show that the filtering system of FCC works effectively, the losses and noise of converter transformer are decreased and system stability is enhanced.

关 键 词：高压直流输电 滤波换相换流器 稳态模型 换相电抗 Graetz桥 滤波 

分 类 号：TM461[电气工程—电器]