面向未来高压直流互联的端对端电力电子拓扑

Front-to-front(FTF)Power Electronic Topologies for Future HVDC Interconnections

高压直流输电,特别是采用模块化多电平变流器的电压源变换器(VSC)技术取得了重大进展。为了更好地深化使用可再生能源,人们越来越多地需要将现有的高压直流输电线路互连到网状的高压直流电网中。介绍了一系列基于端对端VSC结构的电力电子拓扑,作为未来直流互联的元器件。拓扑结构包括DC/DC变换器、DC/DC自耦变压器、直流潮流控制器和高压直流电源分接头。讨论了这些拓扑稳定运行的控制方案。仿真结果验证了所提出控制方案的有效性。

Significant progress has been made in HVDC transmission,particularly to voltage-source-converter(VSC)technology using modular multilevel converters.There is increasing demand to interconnect the existing HVDC lines into meshed HVDC grids for better renewable energy penetration.A series of power electronic topologies,all based on the front-to-front VSC structure,were introduced as devices for future HVDC interconnections.The DC/DC converter,DC/DC auto-transformer,DC power flow controller and HVDC power tap were included in the topologies.The control schemes for stable operation of these topologies were also discussed.Simulation results validate these topologies and establish the effectiveness of the proposed control schemes.