Calculation and simulation analysis of closing surge currents in 35 kV capacitor banks in the Ningxia power grid

MA Feiyue; MA Qing; CUI Wei; MAI Bo

doi:10.3969/j.issn.1672-3643.2024.04.008

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Calculation and simulation analysis of closing surge currents in 35 kV capacitor banks in the Ningxia power grid

更新时间：2026-06-27

- Calculation and simulation analysis of closing surge currents in 35 kV capacitor banks in the Ningxia power grid
- Ningxia Electric Power Issue 4, (2024)
- 作者机构：
  
  1. 国网宁夏电力有限公司电力科学研究院,宁夏,银川,750011
  2. 宁夏电力能源科技有限公司,宁夏,银川,750011
  3. 国网宁夏电力有限公司,宁夏,银川,750001
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.1672-3643.2024.04.008
  CLC：
- Online First：19 September 2024，
  
  Published：2024
- 稿件说明：
移动端阅览
MA Feiyue, MA Qing, CUI Wei, et al. Calculation and simulation analysis of closing surge currents in 35 kV capacitor banks in the Ningxia power grid[J]. Ningxia Electric Power, 2024, (4).
DOI：

MA Feiyue, MA Qing, CUI Wei, et al. Calculation and simulation analysis of closing surge currents in 35 kV capacitor banks in the Ningxia power grid[J]. Ningxia Electric Power, 2024, (4). DOI： 10.3969/j.issn.1672-3643.2024.04.008.

摘要

随着宁夏电网新型电力系统建设的不断推进，新能源及新型用能负荷的特性对无功补偿需求更加迫切，而作为变电站无功补偿中最经济的并联电容组因投切用真空断路器及SF6断路器受高频涌流影响，难以满足频繁投切要求，一定程度制约了供电电压质量提升。从宁夏电网35 kV电容器组配置特点出发，分析变电站通用典型设计后对电容器关合涌流的影响，开展关合涌流简化计算方法及仿真分析研究。实例计算及仿真结果表明，在单个电容器组及背靠背电容器组关合两种方式下，采用简化计算涌流峰值及仿真计算方式偏差分别在10%及20%以内，简化计算方法及仿真模型可为电容器投切开关选型和涌流影响下设备健康评估提供依据。

Abstract

As the construction of the new power system advances in the Ningxia power grid

there is an increasing urgency for reactive power compensation due to the characteristics of new energy and new energy loads.The parallel capacitor bank

as the most economical solution for substation reactive power compensation

faces challenges with frequent switching requirements due to high-frequency surge currents affecting vacuum and SF6 circuit breakers

limiting improvements in power supply voltage quality.This paper examines the configuration characteristics of 35 kV capacitor banks in the Ningxia power grid and analyzes the impact of typical substation designs on capacitor closing surge currents.It presents a simplified calculation method and simulation analysis for these surge currents.Case calculations and simulation results show that the deviation between the simplified calculation of peak surge current and simulation calculation method is within 10%/20%

providing a basis for selecting capacitor switching devices and assessing equipment health under the influence of surge currents.

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