| 引用本文: | 张雪松,马啸,章雷其,王子璇,林湘宁,李正天.有源配电网含不可测分支线路新型电流幅值差动保护判据[J].电力自动化设备,2020,40(2): |
| ZHANG Xuesong,MA Xiao,ZHANG Leiqi,WANG Zixuan,LIN Xiangning,LI Zhengtian.Novel current amplitude differential protection criterion for line with unmeasurable branch in active distribution network[J].Electric Power Automation Equipment,2020,40(2): |
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| 摘要: |
| 电流幅值差动保护的动作性能受不可测分支等实际工程因素的影响。为此，着重分析了有源配电网中含不可测分支线路两侧电流的幅值之差在正常运行以及区内、区外不同故障场景下的特征。在此基础上，利用故障前后被保护线路两侧电流正序分量的幅值之差，分别构成制动量和动作量，提出一种新型电流幅值差动保护判据。仿真结果表明，所提判据能适应不同的不可测分支接入容量。 |
| 关键词: 有源配电网 分布式电源 弱同步系统 电流幅值差动保护 不可测分支 |
| DOI：10.16081/j.epae.202001006 |
| 分类号:TM77 |
| 基金项目:国网浙江省电力有限公司科技项目(5211DS160-01V) |
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| Novel current amplitude differential protection criterion for line with unmeasurable branch in active distribution network |
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ZHANG Xuesong1, MA Xiao2, ZHANG Leiqi1, WANG Zixuan2, LIN Xiangning2, LI Zhengtian2
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1.Electric Power Research Institute of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310014, China;2.State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
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| Abstract: |
| The operation performance of current amplitude differential protection is affected by the unmeasurable branches and other practical engineering factors. For this reason, the characteristics of the amplitude difference of the currents on both sides of the active distribution network with unmeasurable branches under normal operation and different fault scenarios in and out of the area are analyzed. On this basis, a new type of current amplitude differential protection criterion is proposed by using the amplitude difference of the positive sequence component of the current on both sides of the protected line before and after the fault to constitute the braking amount and action amount respectively. Simulative results show that the proposed criterion can adapt to different unmeasurable branch access capacities. |
| Key words: active distribution network distributed power generation weak synchronous system current amplitude differential protection unmeasurable branch |
