| 引用本文: | 刘磊,张翔,王德昌,丁峰峰,陈远俊,方太勋,黄华.基于晶闸管的直流可控避雷器关键技术[J].电力自动化设备,2022,42(9): |
| LIU Lei,ZHANG Xiang,WANG Dechang,DING Fengfeng,CHEN Yuanjun,FANG Taixun,HUANG Hua.Key technology of DC controllable arrester based on thyristor[J].Electric Power Automation Equipment,2022,42(9): |
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| 摘要: |
| 电网换相换流器(LCC)与模块化多电平换流器(MMC)级联系统具备诸多独特优势，但其低压端模块化多电平换流器(MMC)由多个电压源换流器(VSC)换流器并联组成，当发生交流侧故障时会引起低压端直流母线过电压。为抑制MMC过电压问题，提出在直流母线侧安装直流可控避雷器。对交流侧故障时MMC过电压机理进行了理论分析，提出了直流可控避雷器拓扑结构。在深入分析直流可控避雷器不同运行方式的基础上，给出了直流可控避雷器的直流混合可控开关所需的极限电流耐受能力。为实现开关触发的快速性，提出在直流混合可控开关中采用串联晶闸管阀组方案。通过晶闸管Cauer计算模型仿真研究了极限电流下晶闸管阀组瞬态结温，验证了设计方案的合理性。基于某规划直流工程进行直流可控避雷器设计，并给出了主设备布置方案。基于PSCAD/EMTDC平台搭建了系统的仿真模型，验证了所提出的直流可控避雷器拓扑抑制系统MMC过电压的有效性。 |
| 关键词: LCC-MMC混合级联系统 换流器过电压 直流可控避雷器 混合直流可控开关 晶闸管瞬态结温 |
| DOI：10.16081/j.epae.202205009 |
| 分类号:TM721.1 |
| 基金项目:国网电力科学研究院资助项目(JS2001706) |
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| Key technology of DC controllable arrester based on thyristor |
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LIU Lei, ZHANG Xiang, WANG Dechang, DING Fengfeng, CHEN Yuanjun, FANG Taixun, HUANG Hua
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NR Electric Co.,Ltd.,Nanjing 211102, China
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| Abstract: |
| LCC-MMC(Line Commutated Converter-Modular Multilevel Converter) hybrid cascaded system has many unique advantages. However, its low-voltage MMC(Modular Multilevel Converter) consists of multiple VSCs connected in parallel, which will cause overvoltage of low-voltage DC bus under AC-side fault. In order to suppress MMC overvoltage, it is proposed to install a DC controllable arrester at DC bus side. The overvoltage mechanism of MMC under AC-side fault is theoretically analyzed. The topology structure of the DC controllable arrester is proposed. On the basis of in-depth analysis of the different operating modes of the DC controllable arrester, the limit current withstand capability required for DC hybrid controllable switches is given. In order to realize the rapid trigger of switches, the series thyristor valve group scheme is proposed in the DC hybrid controllable switch. The transient junction temperature of the thyristor valve group under the limit current is studied by the Cauer calculation model of thyristor, and the designed scheme is verified. Based on the system parameters of a planned DC project, the parameters of DC controllable arrester are designed and the main equipment layout scheme is given. The simulation model of the system is built based on the PSCAD/EMTDC platform, and the effectiveness of the proposed DC controllable arrester topology on MMC overvoltage suppression is verified. |
| Key words: LCC-MMC hybrid cascaded system converter overvoltage DC controllable arrester DC hybrid controllable switch transient junction temperature of thyristor |
