| 引用本文: | 郑涛,于溯,吴建云,罗美玲.基于波形相关性的混压同塔四回线故障选相新方案[J].电力自动化设备,2020,40(11): |
| ZHENG Tao,YU Su,WU Jianyun,LUO Meiling.Novel scheme of fault phase selection for mixed-voltage four-circuit lines on same tower based on waveform correlation[J].Electric Power Automation Equipment,2020,40(11): |
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| 摘要: |
| 为了解决混压同塔四回线故障情况复杂、发生跨电压故障时无法应用单回线故障选相方法的难题，提出一种基于波形相关性的选相新方案。针对故障相电流相角和幅值的变化情况，提出了波形自相关系数和改进自相关系数判据识别故障相。为防止在强磁耦合场景下错误选相的发生，总结各类故障时电流序分量的特征，进一步提出了电流序分量辅助选相判据，对可能出现的错误选相情况进行再判定。基于PSCAD/EMTDC对混压同塔线路的各类故障进行大量仿真，仿真结果验证了所提故障选相方案的可行性。 |
| 关键词: 混压同塔四回线 继电保护 故障选相 波形自相关系数 改进自相关系数 序分量 |
| DOI：10.16081/j.epae.202008014 |
| 分类号:TM77 |
| 基金项目:国家重点研发计划智能电网技术与装备重点专项(2016YFB0900600)；国家电网公司科技项目(52094017000W) |
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| Novel scheme of fault phase selection for mixed-voltage four-circuit lines on same tower based on waveform correlation |
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ZHENG Tao1, YU Su1, WU Jianyun2, LUO Meiling2
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1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2.State Grid Ningxia Electric Power Company, Yinchuan 750001, China
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| Abstract: |
| In order to solve the problem of complicated fault situation of mixed-voltage four-circuit lines on same tower and the problem that single-line fault phase selection method cannot be applied during cross-voltage fault, a new phase selection scheme based on waveform correlation is proposed. According to the change of the phase angle and amplitude of the fault phase current, the waveform autocorrelation coefficient and the improved autocorrelation coefficient are respectively proposed. To prevent the occurrence of mis-selection of phase in the strong magnetic coupling scene, the current sequence components of various faults are summarized, then the current sequence component-assisted phase selection is proposed to re-determine the possible mis-selection phase. Based on PSCAD/EMTDC, a large number of simulations are carried out for various faults of lines on same tower with mixed-voltage, and the simulative results verify the feasibility of the proposed fault phase selection scheme. |
| Key words: mixed-voltage four-circuit lines on same tower relay protection fault phase selection waveform autocorrelation coefficient improved autocorrelation coefficient sequence components |
