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保护适用性分析

来源:电工电气发布时间:2021-07-20 10:20 浏览次数:433

柔性直流供电网络的电流保护适用性分析

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:在模块化多电平换流器 (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保护的动作性能。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。基于控制与保护协同的思路对故障穿越策略投入与不投入两种情况下三段式电流保护动作性能做了仿真对比,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,电流主保护Ⅰ段、Ⅱ段均拒动,只能由本线路的近后备保护电流Ⅲ段延时切除故障。基于纯交流系统故障电流特性进行整定的三段式电流保护动作性能较差,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;电流保护
    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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