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实现有限选择性的低压微网区域保护
引用本文:林湘宁,袁硕,翁汉琍,李正天,郑荣进.实现有限选择性的低压微网区域保护[J].电网技术,2012(4):149-154.
作者姓名:林湘宁  袁硕  翁汉琍  李正天  郑荣进
作者单位:强电磁工程与新技术国家重点实验室(华中科技大学);中国长江电力股份有限公司三峡水力发电厂;福建工程学院
基金项目:国家863高技术基金项目(2008AA05Z214);国家重点基础研究发展计划项目(973项目)(2009CB219700);国家自然科学基金项目(50837002,50777024);新世纪优秀人才支持计划项目(NCET-07-0325);国家电网公司项目(SGKJJSKF(2008)与2009年项目);中央高校基本科研业务费专项资金资助项目~~
摘    要:目前400 V的用户级微网尚无适用的选择性保护,为此结合含分布式电源时该电压等级电网的实际参数与运行特性,提出一种基于故障分量的微网分区保护方法,将微网划分为若干区域,以区域为单元实施保护,避免了对每个微网一次设备配备保护元件的高成本,同时实现了有限的选择性。测量元件采用基于故障突变量的负序方向原理,可以有效识别各种不对称故障。附加的低电压启动辅助判据能排除不平衡负荷以及大容量单相负荷投切对本保护造成的不利影响。基于EMTDC的仿真试验结果验证了本保护方法的有效性。

关 键 词:微网  分布式电源  区域保护  故障分量  负序阻抗

Study on Finite Selectivity Based Regional Protection Suitable for Low-Voltage Microgrids
LIN Xiangning,YUAN Shuo,WENG Hanli,LI Zhengtian,ZHENG Rongjin.Study on Finite Selectivity Based Regional Protection Suitable for Low-Voltage Microgrids[J].Power System Technology,2012(4):149-154.
Authors:LIN Xiangning  YUAN Shuo  WENG Hanli  LI Zhengtian  ZHENG Rongjin
Affiliation:1.State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science and Technology),Wuhan 430074,Hubei Province,China;2.Three-Gorge Hydropower Plant,China Yangtze Power Co.,Ltd.,Yichang 443133,Hubei Province,China;3.Fujian University of Technology,Fuzhou 350108,Fujian Province,China)
Abstract:At present there is still no applicable selective protection for 400V microgrid,for this reason,based on actual parameters and operation characteristics of 400 V microgrid containing distributed generation(DG) a fault component based partitioned protection approach for microgrid is proposed.Dividing 400 V microgrid into several subareas and regarding each subarea as a unit to be protected,the high cost of configuring protection devices for primary equipments in the 400 V microgrid can be avoided and at the same time the infinite selectivity can be implemented.The negative-direction principle based on abruptly changed quantities caused by faults is applied to measuring elements,thus various unsymmetrical faults can be effectively identified.The additional auxiliary low-voltage startup criterion can get rid of adverse impacts of unbalanced load and switching of high-capacity single-phase load on the proposed protection.Results of simulation based on EMTDC show that the proposed protection approach is effective.
Keywords:microgrid  DG  regional protection  fault component  negative-sequence impedance
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