| 引用本文: | 李政,卢继平,刘加林,何潜.并网光伏电站中性点接地电阻选择与零序保护[J].电力自动化设备,2019,39(12): |
| LI Zheng,LU Jiping,LIU Jialin,HE Qian.Neutral grounding resistance selection and zero-sequence protection for grid connected photovoltaic power station[J].Electric Power Automation Equipment,2019,39(12): |
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| 摘要: |
| 在保障人身和设备安全的前提下，基于零序电流随中性点电阻的变化特性分析，综合站内各级线路零序保护的选择性和灵敏性要求，提出了一种计及光伏源非线性助增和保护动作性能的中性点接地电阻选取方法。针对保护的不同配置，该方法都可以得到兼顾一次系统安全和二次保护性能的电阻取值。最后通过实际工程算例，给出了详细的电阻选择及保护整定方案，验证了所提方法的正确性和可行性。 |
| 关键词: 光伏电站 中性点接地电阻 零序电流特性 光伏非线性助增 继电保护 保护动作性能 |
| DOI：10.16081/j.epae.201911022 |
| 分类号:TM615;TM771 |
| 基金项目:国家自然科学基金资助项目(51577018) |
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| Neutral grounding resistance selection and zero-sequence protection for grid connected photovoltaic power station |
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LI Zheng1, LU Jiping1, LIU Jialin1, HE Qian2
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1.State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China;2.State Grid Chongqing Electric Power Company, Chongqing 401120, China
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| Abstract: |
| Under the premise of ensuring the safety of person and equipment, based on the analysis of the variation characteristics of zero-sequence current with neutral grounding resistance, and combining with the selectivity and sensitivity requirements of zero-sequence protection of all levels of lines in the station, a method for selecting neutral grounding resistance considering the nonlinear boosting of the photovoltaic source and the performance of protection action is proposed. For different configurations of protection, the proposed method can obtain the resistor value considering both primary system security and secondary protection performance. Through the actual engineering examples, the detailed resistor selection and protection setting schemes are given, and the correctness and feasibility of the proposed method are verified. |
| Key words: photovoltaic power station neutral grounding resistance zero-sequence current characteristics nonlinear boosting of photovoltaic source relay protection protection action performance |
