| 引用本文: | 胡 勇,郑黎明,贾 科,等.基于Tanimoto相似度的光伏场站送出线路纵联保护[J].电力系统保护与控制,2021,49(3):73-79. |
| HU Yong,ZHENG Liming,JIA Ke,et al.Pilot protection based on Tanimoto similarity for a photovoltaic station transmission line[J].Power System Protection and Control,2021,49(3):73-79 |
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| 摘要: |
| 受逆变器耐流能力及控制响应特性影响，光伏电源短路电流幅值受限、相角受控，导致比率式差动保护性能下降，光伏场站送出线路缺乏有效的主保护原理。为解决该问题，在分析光伏场站故障特征的基础上，引入Tanimoto相似度刻画光伏场站与同步系统短路电流之间的波形差异。分析了区内、区外故障时相似度系数的变化，最终构造了基于Tanimoto相似度的纵联保护新原理。仿真结果表明该方法能够正确反映区内、区外故障，适用于光伏场站弱出力场景，对高阻故障具有良好的识别能力。 |
| 关键词: Tanimoto相似度 光伏场站 送出线路 纵联保护 |
| DOI：DOI: 10.19783/j.cnki.pspc.200280 |
| 分类号: |
| 基金项目:国家电网公司科技项目资助(SGNW0000DKJS 1900197) |
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| Pilot protection based on Tanimoto similarity for a photovoltaic station transmission line |
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HU Yong, ZHENG Liming, JIA Ke, LI Huaiqiang, ZHANG Jiankang
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(1. Northwest Branch of State Grid Corporation of China, Xi’an 710048, China;
2. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources
(North China Electric Power University), Beijing 102206, China)
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| Abstract: |
| The short-circuit current amplitude of photovoltaic power supply is limited and the phase angle depends on the control system. It is affected by the tolerance ability of current and response characteristics. As a result, the performance of ratio differential protection is reduced, and the transmission line of a photovoltaic station lacks an effective main protection principle. In order to solve this problem, based on the analysis of the fault characteristics of photovoltaic stations, Tanimoto similarity is introduced to describe the waveform difference between the short-circuit current of photovoltaic stations and a synchronous system. After analyzing the change of similarity coefficient during internal faults and external faults, a novel protection based on Tanimoto similarity is proposed. The simulation results show that the method can correctly reflect the internal faults and external faults. It is suitable for the weak output of a photovoltaic station and has good identification ability for high fault resistance.
This work is supported by the Science and Technology Project of State Grid Corporation of China (No. SGNW0000DKJS1900197). |
| Key words: Tanimoto similarity photovoltaic station transmission line pilot protection |
