调相机接入后距离保护Ⅱ段的定值优化策略

doi:10.11930/j.issn.1004-9649.202110027

中国电力 ›› 2022, Vol. 55 ›› Issue (5): 76-83.DOI: 10.11930/j.issn.1004-9649.202110027

调相机接入后距离保护Ⅱ段的定值优化策略

李东升¹, 郝亮亮¹, 郭智琳¹, 曹虹², 王兴国²

1. 北京交通大学电气工程学院，北京 100044;
2. 中国电力科学研究院有限公司，北京 100192

收稿日期:2021-10-14 修回日期:2021-12-06 出版日期:2022-05-28 发布日期:2022-05-18
作者简介:李东升（1996—），男，硕士研究生，从事电力系统主设备故障分析及保护研究，E-mail：19121444@bjtu.edu.cn;郝亮亮（1985—），男，博士，副教授，从事电力系统主设备故障分析及保护、直流输电控制与保护、励磁控制研究，E-mail：llhao@bjtu.edu.cn
基金资助:
电网安全与节能国家重点实验室（中国电力科学研究院有限公司）开放基金资助（JBB51201901229）；国家自然科学基金资助项目（U2066210）；中央高校基本科研业务费资助项目（E19 JB500060）。

A Setting Optimization Strategy for Distance Protection Ⅱ after Connection of Synchronous Condensers

LI Dongsheng¹, HAO Liangliang¹, GUO Zhilin¹, CAO Hong², WANG Xingguo²

1. School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China;
2. China Electric Power Research Institute, Beijing 100192, China

Received:2021-10-14 Revised:2021-12-06 Online:2022-05-28 Published:2022-05-18
Supported by:
This work is supported by Open Fund of State Key Laboratory of Power Grid Safety and Energy Conservation (China Electric Power Research Institute) (No.JBB51201901229), National Natural Science Foundation of China (No.U2066210) and Fundamental Research Funds for the Central Universities (No.E19JB500060).

摘要/Abstract

摘要： 调相机大规模接入电网后会使线路距离保护Ⅱ段的保护范围缩小，保护定值的合理优化是解决该问题的可行途径。为此，分析了调相机接入对距离保护Ⅱ段的影响，提出了一种扩大距离保护Ⅱ段保护范围的定值优化策略。首先，分析调相机的稳态电流以及短路电流，从保护范围的角度分析在传统距离保护Ⅱ段整定方法下调相机接入对距离保护Ⅱ段的影响。然后，从合理选取保护范围设定值与准确计算分支系数出发，提出了距离保护Ⅱ段的定值优化策略，有效扩大了调相机接入后距离保护Ⅱ段的保护范围。最后，对所提定值优化策略进行仿真分析，结果表明，新方法所得的保护范围受调相机接入台数以及相邻线路阻抗比的影响较小，且保护范围可以接近于设定值。

关键词: 同步调相机, 短路电流, 距离保护, 保护范围, 分支系数

Abstract: The large-scale access of synchronous condensers (SCs) to the power grid will reduce the protection range of the distance protection section Ⅱ, and reasonable optimization of the protection setting is a feasible way to solve this problem. For this reason, based on an investigation of the influence of the SCs connection on the distance protection section Ⅱ, a setting value optimization strategy is proposed to increase the protection range of the distance protection section Ⅱ. Firstly, the steady-state current and short-circuit current of SCs are analyzed, and the influence of the SCs access on the protection range under the traditional distance protection Ⅱ setting is investigated from the perspective of the protection range. And then, for the purpose of reasonable selection of the protection range setting value and accurate calculation of branch coefficients, a setting value optimization strategy of distance protection section Ⅱ is proposed, which effectively improves the protection range of the distance protection section Ⅱ after SCs access. Finally, a simulation analysis is conducted on the setting value optimization strategy proposed in this paper, and the results show that the protection range obtained by the proposed method is less affected by the number of SCs and the impedance ratio of adjacent lines, and can be close to the preset value.

Key words: synchronous condenser, short current, distance protection, protection range, branch coefficient

李东升, 郝亮亮, 郭智琳, 曹虹, 王兴国. 调相机接入后距离保护Ⅱ段的定值优化策略[J]. 中国电力, 2022, 55(5): 76-83.

LI Dongsheng, HAO Liangliang, GUO Zhilin, CAO Hong, WANG Xingguo. A Setting Optimization Strategy for Distance Protection Ⅱ after Connection of Synchronous Condensers[J]. Electric Power, 2022, 55(5): 76-83.

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调相机接入后距离保护Ⅱ段的定值优化策略

A Setting Optimization Strategy for Distance Protection Ⅱ after Connection of Synchronous Condensers

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调相机接入后距离保护Ⅱ段的定值优化策略

A Setting Optimization Strategy for Distance Protection Ⅱ after Connection of Synchronous Condensers

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