摘要
基于逆阻型集成门极换流晶闸管串联阀组的特高压主动换相换流阀是构建我国新型电力系统的关键换流装备之一。由于阀臂器件主动关断不一致引起的器件间电压分布不均现象,一方面威胁器件的运行可靠性,另一方面将造成阀臂器件的过度冗余使换流阀建设成本增加。为此,该文首先通过分析集成门极换流晶闸管(intergrated gate commutated thyristors,IGCT)器件开关特性,建立基于物理特性的器件模型并通过试验数据对模型进行校核;其次,基于器件模型开展了阀最小单元的串联均压特性研究,在驱动延迟条件下分析了缓冲回路杂散电感、缓冲阻容参数对器件间不均压系数的影响,以不均压系数5%为前提给出阻容参数的选取范围。最后,提出“RCD+MOV”拓扑,并对其均压效果进行仿真分析。结果表明,所提拓扑具有较好的均压效果,当驱动延迟200ns时,不均压系数仅为2.59%,相比原拓扑降低64.7%,研究工作对今后IGCT串联阀组的均压设计具有一定参考价值。
The ultra-high voltage active commutation converter based on series valve group of reverse blocking integrated gate commutated thyristors(RB-IGCT)is one of the key commutation equipment for constructing novel power system.The uneven distribution of voltage stress caused by inconsistent switching of valve arm devices can threaten the operational reliability of the devices,and on the other hand,it will cause excessive redundancy of devices in the valve arm,which resulting in increased construction costs for the converter valve.To this end,this article first analyzes the switching characteristics of IGCT devices,establishes the IGCT model based on physical characteristics,and verifies the model by experimental.Secondly,the study of the series voltage sharing characteristics of the subunit was carried out.The influence of the stray inductance,resistance and capacitance parameters of the snubber on the voltage sharing coefficient between devices under the condition of drive delay was analyzed.The selection range of the snubber parameters was given based on the premise of a voltage sharing coefficient of 5%.Finally,the“RCD+MOV”snubber topology was proposed and its effect was simulated and analyzed.The results show that the new topology has better voltage equalization effect.When the drive delay is 200 ns,the voltage non-equalization coefficient is only 2.59%,which is 64.7%lower than the original topology.This study has certain reference value for the future design of voltage sharing for IGCT series valve group.
作者
张胤禄
汤广福
魏晓光
单云海
余占清
张闻闻
张杰
ZHANG Yinlu;TANG Guangfu;WEI Xiaoguang;SHAN Yunhai;YU Zhanqing;ZHANG Wenwen;ZHANG Jie(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China;Beijing Huairou Laboratory,Huairou District,Beijing 101400,China;Dept.of Electrical Engineering,Tsinghua University,Haidian District,Beijing 100084,China)
出处
《中国电机工程学报》
北大核心
2025年第16期6449-6460,I0025,共13页
PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING
作者简介
张胤禄(1998),男,博士研究生,研究方向为高压直流输电技术及特高压直流换流装备应用研究,Zhangyinlu_98@163.com;通信作者:魏晓光(1976),男,博士,教授级高级工程师,研究方向为直流输电技术与直流电网设备等,weixiaoguang@neps.hrl.ac.cn。
