电力系统自动化Issue(21)：132-137,6.DOI:10.7500/AEPS20150105001
并联换流器高压直流输电系统控制策略
Control Strategies for HVDC Transmission System with Parallel Connection of Converters
摘要
Abstract
With the development of high voltage direct current (HVDC) transmission technology in China,parallel converters are drawing ever-increasing attention to their structure.The HVDC transmission system with parallelly connected converters is particularly advantageous when the transmission is built by stages or in the de-icing operation mode.The characteristics of a 4-terminal HVDC system with parallel converters are analyzed at length.A new multi-terminal dc system coordinated mode is proposed for rectifier control of DC current and inverter control of DC voltage.And an additional special DC balancing control function is applied to avoid an unambiguous operating DC voltage.This coordinated mode has not only retained the relative independence of the bi-parallelly connected DC system as best it can,but also it has simplified the control system design for the 4-terminal HVDC transmission.In addition,it is now possible to realize flexible power allotment between parallelly connected converters.De-blocking the second valve and blocking the first valve being of special interest for parallel operation,methods of doing this are also described.Finally,a case study of 4-terminal HVDC system with parallelly connected converters has validated the control strategies using PSCAD/EMTDC.关键词
并联换流器/直流电流平衡控制/高压直流/换流器解锁/闭锁控制/对偶原理Key words
parallelly connected converters/DC current balancing control/high voltage direct current (HVDC)/converter de-blocking/blocking control/dual principle引用本文复制引用
李少华,王秀丽,张爱玲,彭忠,荆雪记..并联换流器高压直流输电系统控制策略[J].电力系统自动化,2015,(21):132-137,6.基金项目
国家电网公司科技项目“多换流器并联特高压直流输电工程的关键技术研究”。This work is supported by State Grid Corporation of China （）
