摘要
电压源换相高压直流输电是基于电压源换流器(VSC)的新一代高压直流输电技术。首先对VSC-HVDC的内外环控制进行分析,确定内外环控制方式,然后对多端柔性直流输电(VSC-MTDC)的控制策略进行研究,采用电压下降的控制方式对五端直流系统进行建模,利用PSCAD/EMTDC仿真软件进行仿真模拟。结果表明采用电压下降控制方式的VSC-MTDC具有良好的系统协调性,具备利用上层控制可以快速自动调节功率分配的特性,并且具有良好的扩容性。
VSC - HVDC transmission is a new generation of high - voltage DC transmission technology based on voltage source converter （VSC）. The inner ring and outer ring control of VSC - HVDC is analyzed firstly to determine the inner and outer ring control method, and the control strategies of multiterminal VSC - HVDC transmission system （ VSC - MTDC ） are stud- ied. The modeling of five - terminal DC system is carried out using the voltage - droppd control, and the simulation is done with PSCAD/EMTDC simulation software. The results show that VSC - MTDC has a good system compatibility under the volt- age - droppd control, has the characteristics of adjusting power allocation fast and automatically using the upper control, and can expand its capacity easily.
出处
《四川电力技术》
2014年第1期1-4,9,共5页
Sichuan Electric Power Technology
基金
国家科技部"973"项目(2013CB22804)
国家电网公司科技项目资助
