| 引用本文: | 孙吉波,王宇,刘崇茹,伍双喜,刘俊磊,黄国栋.基于MMC的多端直流电网双极短路故障电流计算[J].电力自动化设备,2018,(11): |
| SUN Jibo,WANG Yu,LIU Chongru,WU Shuangxi,LIU Junlei,HUANG Guodong.Pole-to-pole short circuit current calculation of multi-terminal DC grid based on MMC[J].Electric Power Automation Equipment,2018,(11): |
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| 摘要: |
| 直流侧故障切除能力是衡量直流输电系统的重要指标。针对子模块采用半桥拓扑的模块化多电平换流器(MMC)直流侧发生双极短路故障的机理进行分析，定量研究了影响故障电流峰值的主要因素；并将结论延伸至多端直流电网，提出了不同电网拓扑和不同位置发生故障后10 ms内各换流站出口、线路电流的计算方法；在PSCAD/EMTDC仿真软件中搭建三端电磁暂态仿真模型，并将故障电流计算结果与仿真结果进行对比验证，结果表明所提计算方法具有一定的精度和速度，对直流电网规划、直流断路器选型具有一定的指导意义。 |
| 关键词: 多端直流电网 模块化多电平换流器 双极短路 故障电流计算 |
| DOI：10.16081/j.issn.1006-6047.2018.11.011 |
| 分类号:TM713;TM46 |
| 基金项目:广东电网有限责任公司科技项目(GDKJXM20162608) |
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| Pole-to-pole short circuit current calculation of multi-terminal DC grid based on MMC |
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SUN Jibo1, WANG Yu2, LIU Chongru2, WU Shuangxi1, LIU Junlei1, HUANG Guodong1
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1.Electric Power Dispatching Control Center of Guangdong Power Grid Co.,Ltd.,Guangzhou 510600, China;2.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
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| Abstract: |
| DC-side fault removal capability is an essential index for evaluating DC transmission systems. The mechanism of DC-side pole-to-pole short circuit fault in HBSM(Half-Bridge Sub-Module) based MMC-HVDC(Modular Multilevel Converter based High Voltage Direct Current) system is analyzed, and the main factors affecting the peak value of fault current are studied quantitatively. Then, the conclusions are extended to the multi-terminal MMC system, and a calculation method for outlet current of each converter station and line current within 10 ms after faults is proposed, which is applicable for different power grid topologies and different fault locations. The electromagnetic transient simulation model of a three-terminal system is built in PSCAD/EMTDC simulation software, and the calculative results of fault current are compared with the simulative results. The results show that the proposed calculation method has a certain accuracy and speed, and has guiding significance for DC power grid planning and selection of DC circuit breakers. |
| Key words: multi-terminal DC grid modular multilevel converter pole-to-pole short circuit fault current calculation |
