VSC-HVDC主电路拓扑及其调制策略分析与比较  

Analysis and Comparison of VSC-HVDC Topologies and Corresponding Modulation Schemes

作　　者：丁冠军[1,2] 丁明[1] 汤广福[2] 

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽省合肥市230009 [2]中国电力科学研究院,北京市100192

出　　处：《电力系统自动化》2009年第10期64-68,共5页Automation of Electric Power Systems

基　　金：国家重点基础研究发展计划(973计划)资助项目(2004CB217907);国家电网公司科技项目(SGKJ[2007]249)~~

摘　　要：立足电压源换流器(VSC)-高压直流(HVDC)输电工程实际,旨在解决选用何种VSC拓扑方能使VSC-HVDC输电达到最佳性能,即找出相对最优的VSC拓扑及其调制策略。结合相应衡量指标,首先比较研究了两电平VSC采用不同调制策略时的特性,此比较研究较好平衡了两电平VSC谐波特性与开关频率这一对矛盾体;接着,对此比较研究中得出的相对最优拓扑与两电平12脉动、三电平二极管钳位及模块化多电平VSC间的特性进行分析;最后,得出结论:基于特定次谐波消除脉宽调制的两电平VSC与模块化多电平VSC为切实可行的2种换流器拓扑,其具有各自不同的应用场合特征。另外,结合实际VSC-HVDC输电工程建设的要求,给出了选型的基本方法和经验,并通过仿真加以了验证。Based on the requirements of VSC-HVDC transmission projects, this paper aims to find out the suitable VSC topology to obtain the best performance of VSC-HVDC, i.e., relatively optimal VSC topology and related modulation scheme. Firstly, considering relevant measurement indexes, the performances of two-level VSC adopting different modulation schemes are compared. This comparison study balances the contradiction between the harmonic property and switching frequency of two-level VSC. Then, the performances of the relatively optimal topology obtained in this comparison study, two-level 12- pulses, three-level neutral point clamped （NPC） and modular multilevel VSC are also compared. Finally, the conclusion is drawn that two-level VSC based selective harmonic elimination PWM （SHEPWM） and modular multilevel VSC are most feasible, and each has their own application features. In addition, combined with the demands of practical VSC-HVDC engineering construction, the basic methods and experience of equipment type selection are presented and verified by simulations.

关 键 词：高压直流输电 电压源换流器(VSC) 拓扑 调制策略 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM46