大型风电基地多端VSC-HVDC系统综述

随着近年来全控型器件的出现和发展以及脉宽调制(PWM)技术的日臻成熟,为VSC-HVDC技术的产生和发展创造了条件,而多端VSC-HVDC技术可以很好地解决孤岛供电、分布式发电系统接入大电网等问题.文章就VSC-HVDC原理进行阐述,通过对比交流输电和常规HVDC来突出VSC-HVDC的优点,并简单介绍了VSC-HVDC的关键部分也就是变流器的运行模式.文章重点论述大型风电基地多端VSC-HVDC系统的拓扑结构和协调控制策略,并对其未来发展趋势作出预测.

A Review of Muti-Terminal VSC-HVDC System in Large Wind Farms

In recent years,the upgrowth of fully-controlled devices and pulse width modulation device PWM technology,has paved the way for the appearance and progression of VSC-HVDC technology.Multi-terminal VSC-HVDC technology can be applied to address such problems as island supply,distributed generation system connecting to large power grids,etc.This paper elucidates the principle of VSC-HVDC,and compares AC transmission and normal HVDC,aimed at highlighting the advantages of VSC-HVDC.The working mode of convertors,a key part of VSC-HVDC,is also briefly introduced.More importantly,this paper demonstrates topology and coordination control strategy of multi-terminal VSC-HVDC system in large-scale offshore wind farms,and predicts its future development trend.