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    Suzhou Electric Appliance Research Institute
    期刊号: CN32-1800/TM| ISSN1007-3175

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    柔性直流供电网络的电流?;な视眯苑治?/h3>
    来源:电工电气发布时间:2021-07-20 10:20 浏览次数:11

    柔性直流供电网络的电流?;な视眯苑治?/span>

    高媛,杨炳元,李东升
    (内蒙古工业大学 电力学院,内蒙古 呼和浩特 010080)
     
        摘 要:在??榛嗟缙交涣髌?(MMC) 逆变站交流线路发生故障时,MMC 短路电流幅值受到控制策略的影响大,进而可能影响三段式电流?;さ亩餍阅?。鉴于此在 RTDS 平台上搭建了向无源网络供电的柔性交直流配电网系统,然后在 MMC 控制器内设计了交流故障穿越策略?;诳刂朴氡;ば乃悸范怨收洗┰讲呗酝度胗氩煌度肓街智榭鱿氯问降缌鞅;ざ餍阅茏隽朔抡娑员?,仿真结果表明,当 MMC 逆变站交流线路发生不对称故障时,在交流故障穿越策略作用下,电流主?;あ穸?、Ⅱ段均拒动,只能由本线路的近后备?;さ缌鳍蠖窝邮鼻谐收??;诖拷涣飨低彻收系缌魈匦越姓ǖ娜问降缌鞅;ざ餍阅芙喜?,已经不再适用于 MMC 逆变站交流线路。
        关键词:柔性交直流配电网;无源网络;MMC ;故障穿越策略;短路电流;电流?;?/div>
        中图分类号:TM727 ;TM732     文献标识码:A     文章编号:1007-3175(2021)07-0017-07
     
    Analysis of the Applicability of Current Protection of Flexible
    DC Power Supply Network
     
    GAO Yuan,YANG Bing-yuan, LI Dong-sheng
    (School of Electric Power, Inner Mongolia University of Technology, Hohhot 010080, China)
     
        Abstract: When the AC line fault of modular multi-level converter (MMC) inverter occurs, the MMC short-circuit current amplitude is greatly affected by the control strategy, which probably affects the operation performance of the three-section current protection additionally. To solve this problem, a flexible AC/DC distribution network system supplying power to passive network is built on the real time digital simulation system (RTDS) and then an AC fault ride-through strategy is designed in the MMC controller. Considering the integration of controlling and protection, this paper compared the different operation performances of three-section current protection in the condition of fault ride-through strategy input and non-input. The results demonstrate that when the asymmetrical fault occurs on the AC line of MMC inverters, neither section I nor section II of the main current protection operates under the AC fault ride-through strategy, but only the closest backup production section III is able to remove the fault with delay. In conclusion, the three-section current protection, setting for the fault current characteristics of the pure AC system, has a poor performance on current protection accordingly no longer available for the AC line of MMC inverters.
        Key words: flexible AC/DC distribution network; passive network; MMC; fault ride-through strategy; short-circuit current; current protection
     
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