Analysis of New Grounding Mode for Neutral Point of Giant Hydro-generator

ZHANG Dandan; CHEN Junqin; YANG Ruilin

doi:10.13296/j.1001-1609.hva.2023.01.001

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Analysis of New Grounding Mode for Neutral Point of Giant Hydro-generator

更新时间：2025-04-26

- Analysis of New Grounding Mode for Neutral Point of Giant Hydro-generator
- High VoltageApparatus Vol. 59, Issue 1, Pages: 1-7(2023)
- 作者机构：
  
  华中科技大学强电磁工程与新技术国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2023.01.001
  CLC： TM862;TV734.2
- Published：2023
- 稿件说明：
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ZHANG Dandan, CHEN Junqin, YANG Ruilin. Analysis of New Grounding Mode for Neutral Point of Giant Hydro-generator[J]. High voltageapparatus, 2023, 59(1): 1-7.
DOI：

ZHANG Dandan, CHEN Junqin, YANG Ruilin. Analysis of New Grounding Mode for Neutral Point of Giant Hydro-generator[J]. High voltageapparatus, 2023, 59(1): 1-7. DOI： 10.13296/j.1001-1609.hva.2023.01.001.

摘要

水轮发电机采用的主流接地方式为经消弧线圈接地和经配电变压器高阻接地两种方式，但随着发电机容量的增加，这两种接地方式难以同时将故障电流和暂态过电压控制在标准范围内。文中以某水电站巨型水轮发电机为对象，对电阻加补偿电抗的新型组合接地方式进行研究。首先通过理论分析得到“电阻—电抗”串联、“电阻—电抗”并联接地方式在短路电流限值下电阻、电抗的取值区间，其次建立MATLAB/Simulink仿真模型对4种不同接地方式下的暂态过电压进行计算。结果表明：相同短路电流限值下，“电阻—电抗”并联的接地方式抑制暂态过电压的效果好于“电阻—电抗”串联的接地方式，可以将其限制在标准范围内。采用并联接地方式时会使脱谐度减小，但位移过电压增大。本研究可以为巨型水轮发电机中性点的接地方式提供参考。

Abstract

The main grounding method adopted by the hydroelectric generators has such two modes as grounding through the arc suppression coil and through high resistance of distribution transformer. However

with the increase of capacity of generator

it is difficult for these two grounding modes to control the fault current and the transient overvoltage within the standard range simultaneously. In this paper

a giant hydro-generator is taken as the object

the innovative combined grounding mode of resistance with compensation reactance is studied. First

the value interval of resistance and reactance of the grounding mode of“resistance and reactance in series”and“resistance and reactance in parallel”under short circuit limit is obtained by theoretical derivation. Then

the transient over-voltage under 4 different types of grounding modes is calculated by setting up MATLAB/Simulink simulation model. The results show that under the same short circuit current limit

the effect of suppressing transient over-voltage by the grounding mode of resistance and reactance in parallel is better than that of series mode

which can be limited in the standard range.The detuning degree

in case of adopting shunt grounding mode

can be decreased

but the displacement over-voltage will increase.The research can provide a reference for the neutral grounding mode of giant hydro-generators.

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