摘要
过电压特性与系统接地方式密切相关,对关键设备选取、设计具有重要意义,但目前在直流配电网中结合过电压分析进行接地方式选择的研究仍不完善。文中首先基于模块化多电平换流器(modular multi-level converter,MMC)型±10 kV双端直流配电网分析过电压产生机理,并通过PSCAD/EMTDC平台的故障仿真,对比3种典型接地方式下系统关键位置的过电压峰值。然后,提出综合故障恢复能力、经济性、电压稳定性、过电压峰值作为指标进行接地方式的选择,评估得出交流侧变压器中性点经电阻接地、直流侧不接地为所研究系统的优选接地方式。最后,基于荷电率计算设计方法确定相应的避雷器参数与配置方案,并通过仿真进行了有效性验证。研究结论为直流配电网接地方式选择与绝缘配置提供了参考。
The characteristics of overvoltage are closely related to the system grounding mode,which is of great significance to the selection and design of key equipment.However,the research on grounding mode selection combined with overvoltage analysis in DC distribution network is still imperfect.Firstly,the mechanism of overvoltage generation is analyzed for±10 kV dual-terminal DC distribution network based on modular multi-level converter(MMC),and the overvoltage peak values at key positions of the system under three typical grounding modes are compared by fault simulation in PSCAD/EMTDC.Then,the fault recovery ability,economy,voltage stability and overvoltage peak value are proposed as the indexes for the comprehensive selection of grounding mode.Grounding by resistance through neutral point of the transformer in AC side and ungrounding in DC side is evaluated as the preferred grounding mode of the studied system.Finally,the arrester parameters and configuration scheme are determined based on the chargeability calculation design method,and the validity is verified by simulation.References for the selection of grounding mode and insulation configuration of DC distribution network are supplied by the research.
作者
刘鉴雯
吴在军
曹骁勇
杨景刚
陈庆
张勋友
LIU Jianwen;WU Zaijun;CAO Xiaoyong;YANG Jinggang;CHEN Qing;ZHANG Xunyou(School of Electrical Engineering,Southeast University,Nanjing 210096,China;State Grid Jiangsu Electric Power Co.,Ltd.Research Institute,Nanjing 211103,China;State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210024,China;Mechanical and Electronic Engineering College,Chizhou University,Chizhou 247122,China)
出处
《电力工程技术》
北大核心
2023年第3期19-26,共8页
Electric Power Engineering Technology
基金
国家重点研发计划资助项目(2018YFB0904700)
国家电网有限公司科技项目(SGJS0000YJJS1801250)。
关键词
模块化多电平换流器(MMC)
直流配电网
接地方式
过电压分析
绝缘配置
故障仿真
modular multi-level converter(MMC)
DC distribution network
grounding mode
overvoltage analysis
insulation configuration
fault simulation
作者简介
刘鉴雯(1996),男,硕士在读,研究方向为配电网保护与故障定位(E-mail:220192737@seu.edu.cn);吴在军(1975),男,博士,教授,研究方向为分布式发电与微电网、主动配电网、变电站自动化;曹骁勇(1990),男,博士在读,研究方向为直流配电网保护。
