新型多电平电压源换流器模块的拓扑机制与调制策略  

Topology Mechanism and Modulation Scheme of a New Multilevel Voltage Source Converter Modular

作　　者：丁冠军[1] 汤广福[1] 丁明[2] 贺之渊[1] 

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

出　　处：《中国电机工程学报》2009年第36期1-8,共8页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2004CB-217907);国家电网公司重点科技项目(SGKJ[2007]249)~~

摘　　要：揭示一种新型多电平电压源换流器(voltage source converter,VSC),即模块化多电平VSC的起源与工作机制;介绍其子模块与VSC拓扑及相应工作原理;针对此新型换流器拓扑,并结合基于VSC的高压直流输电领域(high voltage direct current transmission system based on VSC,VSC-HVDC),提出一种基于幂和理论的改进型多电平基频开关调制策略。与通常策略中所使用的数字迭代技术,如"牛顿-拉夫逊"法相比,该文所提算法可显著简化运算、降低计算量,且能求出开关角的所有解;而通常算法仅能求出单一解,忽略了可能存在的其他解,最后进行了仿真验证。理论分析与仿真结果均说明关于模块化多电平VSC本质揭示的正确性及所提调制策略的优越性。This paper reveal the origin and working mechanism of a new multilevel voltage source converter （VSC）, i.e. modular multilevel VSC. The working principles of the submodules of VSC and converter topology are introduced. In view of this new VSC topology, considering the field of high voltage direct current transmission system based on VSC （VSC-HVDC）, a modified multilevel fundamental switching modulation scheme based on the power sums theory is presented. Compared with the numerical iterative techniques commonly used in previous schemes, such as Newton-Raphson, the scheme proposed can greatly simplify the calculation, reduce the computational burden, and produce all possible solutions of the switching angles; in contrast, the traditional schemes can only get one solution, omitting all the other possible solutions. Finally, the simulation verifications are given. The theory analysis and simulation results adequately demonstrate the correctness of the essential working mechanism of the modular multilevel VSC and the superiority of the proposed modulation scheme.

关 键 词：模块化多电平电压源换流器 高压直流输电 拓扑 本质机制 幂和理论 多电平基频开关调制策略 

分 类 号：TM46[电气工程—电器]