集中式光伏电站汇集系统故障分析与保护方案
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TM77

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国家自然科学基金资助项目(51877012)


Failure analysis and protection scheme of centralized photovoltaic power station convergence system
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National Natural Science Foundation of China (51377012) Double-class key project of Hunan Provincial Department of Education (18A121)

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    摘要:

    为解决现有集中式光伏电站阶段式电流保护存在的拒动或误动问题,文中建立了集中式光伏电站升压入网仿真模型,结合逆变器的控制目标及光伏自身的输出特性,推导光伏侧提供的稳态短路电流解析表达式。在此基础上,逐一分析架空线路、汇集电缆、集电线路发生故障时,传统故障分析与保护方案的适应性。针对架空线路故障时原后备保护不足的问题,提出下游汇集站侧距离保护代替原阶段式电流保护的方案;对现有保护方案难以区分集电线路故障与汇集电缆故障的问题,提出基于熔断器配合的反时限保护方案。PSCAD仿真结果表明,所提保护方案对常见故障类型均能可靠动作。

    Abstract:

    In order to solve the problem of refusal or misoperation in the staged current protection of the existing centralized photovoltaic power station, a simulation model for the boosted grid connection of the centralized photovoltaic power station is established, which combines the control target of the inverter and the output characteristics of the photovoltaic itself. The analytical expression of the steady-state short-circuit current provided by the photovoltaic side is derived. On the basis of expressions, the adaptability of traditional fault analysis and protection schemes is analyzed one by one when fault occurs on the overhead line, the collection cable, and the current collection line respectively. In view of the shortcomings of the original backup protection when the overhead line fails, the distance protection at the downstream collecting station side is proposed to replace the original staged current protection. For the existing protection scheme, it is difficult to distinguish the collecting line fault from the collecting cable fault. Then, inverse time protection scheme is proposed. PSCAD simulation results show that the proposed protection scheme can reliably operate on common fault types.

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易洋,骆雅姿,张子瑜,龙玺,汪东.集中式光伏电站汇集系统故障分析与保护方案[J].电力工程技术,2021,40(2):2-10

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历史
  • 收稿日期:2020-09-09
  • 最后修改日期:2020-10-26
  • 录用日期:2020-09-21
  • 在线发布日期: 2021-04-02
  • 出版日期: 2021-03-28