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灵活接地系统小电阻退出暂态特征及对暂态故障选线方法影响
作者:
作者单位:

1.中国石油大学(华东)新能源学院,山东省青岛市 266580;2.广西电网电力调度控制中心,广西壮族自治区南宁市 530023;3.山东理工大学智能电网研究院,山东省淄博市 255049

摘要:

灵活接地系统发生高阻接地故障时,中性点小电阻并联阶段保护往往拒动,仍需考虑小电阻退出时的暂态特征对已有暂态故障选线方法的影响。并联小电阻退出时伴随一定的暂态过渡过程,针对此过程建立灵活接地系统单相接地故障暂态等值电路。文中分析了并联小电阻退出时系统各暂态电气量特征、不同故障情况对暂态电气量幅值的影响、暂态零序电流与暂态零序电压的约束关系,明确并联小电阻退出后暂态量对暂态故障选线方法稳定性的影响。当灵活接地系统高阻接地故障小电阻退出时,产生的暂态电气量将导致暂态幅值比较法、暂态极性选线法、暂态功率方向法误动,但暂态零序电流投影法选线正确,仿真验证了结果的正确性。

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基金项目:

国家自然科学基金资助项目(52077221)。

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作者简介:


Transient Characteristics of Small Resistor Exit in Flexible Grounding System and Implications for Transient Fault Line Selection Methods
Author:
Affiliation:

1.College of New Energy, China University of Petroleum (East China), Qingdao 266580, China;2.Guangxi Power Grid Power Dispatching Control Center, Nanning 530023, China;3.Research Center for Smart Grid, Shandong University of Technology, Zibo 255049, China

Abstract:

When a high-resistor grounding fault occurs in a flexible grounding system, the protection during the parallel stage of neutral point small resistor often refuses to activate, so it is still necessary to consider the impact of the transient characteristics of small resistor exit on the existing transient fault line selection methods. The exit of the parallel small resistor is accompanied by a certain transient transition process. For this process, a transient equivalent circuit for a single-phase grounding fault in a flexible grounding system is established. The characteristics of transient electrical quantities of the system when the parallel small resistor exits, the impact of different fault conditions on the amplitude of transient electrical quantities, and the constraint relationship between transient zero-sequence current and transient zero-sequence voltage are analyzed. The impact of transient quantities after the exit of parallel small resistor on the stability of the transient fault line selection methods is clarified. When the small resistor exits during a high-resistor grounding fault in a flexible grounding system, the generated transient electrical quantities will cause misoperation in the transient amplitude comparison method, transient polarity selection method, and transient power direction method, but the transient zero-sequence current projection method for the line selection is correct. The simulation verifies the accuracy of the results.

Keywords:

Foundation:
This work is supported by National Natural Science Foundation of China (No. 52077221).
引用本文
[1]王小帅,薛永端,刘萃萃,等.灵活接地系统小电阻退出暂态特征及对暂态故障选线方法影响[J/OL].电力系统自动化,http://doi. org/10.7500/AEPS20230828003.
WANG Xiaoshuai, XUE Yongduan, LIU Cuicui, et al. Transient Characteristics of Small Resistor Exit in Flexible Grounding System and Implications for Transient Fault Line Selection Methods[J/OL]. Automation of Electric Power Systems, http://doi. org/10.7500/AEPS20230828003.
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  • 收稿日期:2023-08-28
  • 最后修改日期:2024-05-30
  • 录用日期:2024-03-25
  • 在线发布日期: 2024-06-04
  • 出版日期: