| 引用本文: | 刘玮,赖清华,刘慧媛,张哲,谭涛亮.适用于逆变型电源接入的故障方向判别新方法[J].电力自动化设备,2020,40(1): |
| LIU Wei,LAI Qinghua,LIU Huiyuan,ZHANG Zhe,TAN Taoliang.Novel method of fault direction identification for inverter-interfaced power supply access[J].Electric Power Automation Equipment,2020,40(1): |
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| 摘要: |
| 由于新能源电源馈出的短路故障特性与同步发电机存在较大差异，当传统方向元件应用于新能源场站的联络线和集电线时，无法保证其动作的正确性。因此根据逆变型电源馈出的短路电流的特点，提出一种适用于逆变型电源接入的故障方向判别新方法。该方法利用序电压进行故障类型判断，在此基础上，根据正、反方向故障时各序电流比值和电流幅值差异，进行故障方向辨识。数字仿真结果表明，该方法在不同故障类型下均能正确判断故障方向，且受过渡电阻的影响较小，具有良好的工程应用价值。 |
| 关键词: 新能源 逆变型电源 方向元件 故障方向 继电保护 判据 |
| DOI：10.16081/j.epae.202001005 |
| 分类号:TM77 |
| 基金项目:广东电网有限责任公司科技项目(031700KK5216-0004)；国家重点研发计划项目(2016YFB0900600) |
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| Novel method of fault direction identification for inverter-interfaced power supply access |
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LIU Wei1, LAI Qinghua2, LIU Huiyuan3, ZHANG Zhe2, TAN Taoliang3
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1.Power Dispatching Control Center of Guangdong Power Grid Corporation, Guangzhou 510000, China;2.State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;3.Yangjiang Power Supply Bureau of Guangdong Power Grid Corporation, Yangjiang 529500, China
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| Abstract: |
| The characteristics of short circuit current of renewable energy sources are quite different from those of traditional generators. When applied to tie lines and collector lines of renewable energy stations, the traditional direction components may not operate correctly. A novel method of fault direction identification suitable for the inverter-interfaced power supply access based on the fault features of renewable energy sources is proposed. The fault type is judged by sequence voltage, and the fault direction is identified according to the difference of sequence current ratio and current amplitude between forward and backward faults. The digital simulative results show that the proposed method can correctly judge the fault direction in different fault types, and is less affected by the transition resistance, so it has good engineering application value. |
| Key words: renewable energy sources inverter power direction components fault direction relay protection criterion |
