基于电压源换流器的三端直流输电系统运行特性

为了研究不同直流网络拓扑结构下电压源换流器型三端直流(VSC-TTDC)系统的运行特性,建立环形和星形两种网络拓扑结构的电磁暂态分析模型,利用Matlab和PSCAD/EMTDC分别实现了不同拓扑结构下VSC-TTDC系统的直流潮流计算和电磁暂态分析,并对两种不同拓扑结构进行全面的对比。结果表明:环形结构具有可靠性高、星形结构经济性好;输电任务较重的场合应优先选择环形结构,对系统电磁暂态特性要求较高的场合应选择星形结构。

Operational Characteristics of VSC based Three Terminal Direct Current Transmission System

In order to study the performance of different topological structures of DC network of voltage source converter based threeterminal direct current（ VSC-TTDC） transmission system,electromagnetic transient models of two kinds of topological structures which are ring and star are stablished. DC power flow calculations and electromagnetic transient features are achieved in Matlab PSCAD /EMTDC. Comprehensive comparisons found that： The annular structure has the advantages of high reliability,while star structure has good economy; transmission heavier tasks occasions should choose a ring structure,while the star structure meets the requirements of demanding higher electromagnetic transient characteristics.