Research on Suppression Strategy of Transient Overvoltage in New Energy Transmission System Based on Open-phase Control of SVG

WANG Chenxing; LI Pengfei; PENG Long; LIU Yichen; WANG Cong

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Research on Suppression Strategy of Transient Overvoltage in New Energy Transmission System Based on Open-phase Control of SVG

更新时间：2025-06-18

- Research on Suppression Strategy of Transient Overvoltage in New Energy Transmission System Based on Open-phase Control of SVG
- High Voltage Apparatus Pages: 1-12(2025)
- 作者机构：
  
  1.华北电力科学研究院有限责任公司　北京　 100045
  2.国网冀北电力有限公司电力科学研究院，北京　 100045
  3.国家电网公司华北分部，北京　 100053
- 作者简介：
- 基金信息：
  
  Science and Technology Project of North China Branch of SGCC(1100/2022-02001B)
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- 稿件说明：
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WANG Chenxing, LI Pengfei, PENG Long, et al. Research on Suppression Strategy of Transient Overvoltage in New Energy Transmission System Based on Open-phase Control of SVG[J/OL]. High voltage apparatus, 2025, 1-12.
DOI：

WANG Chenxing, LI Pengfei, PENG Long, et al. Research on Suppression Strategy of Transient Overvoltage in New Energy Transmission System Based on Open-phase Control of SVG[J/OL]. High voltage apparatus, 2025, 1-12. DOI：

摘要

针对新能源集中送出系统的人工接地短路试验和仿真结果表明，风电、光伏汇集线路发生单相瞬时接地故障后，系统在故障相分闸至重合期间存在暂态过电压，并已成为制约新能源送出能力的主要因素之一。文中基于对典型新能源集中送出工程暂态过电压的仿真计算和人工接地短路试验结果，分析了汇集线路故障发生及清除后暂态过电压的阶段性特征及其产生机制；研究了静止无功发生器（static var generator，SVG）在原有控制策略下的无功响应情况与系统过电压情况的关联性，分析了原有策略的缺陷；进而从动作逻辑和判断条件角度提出了SVG装置无功控制策略的优化调整方法，并通过对比仿真验证了优化策略的合理性及有效性。结果表明：通过增加SVG缺相控制，以系统缺相运行期间三相电压不平衡特征作为该模式进出判据，能够在不影响已有低压/高压故障穿越控制模式的前提下，使SVG正确判断和迅速响应进入或退出缺相模式；并且通过将缺相模式下SVG无功响应值设定为一较低恒定值，能够显著降低新能源送出系统暂态过电压水平。

Abstract

According to the results of artificial earthing experiment and simulating calculation

it is suggested that the transient voltage after single-phase transient fault has been a main restraining factor of power delivery capacity in new energy transmission system. In this paper

the periodical characteristics and mechanism of the transient voltage caused by single-phase fault was analyzed based on simulating calculation of a typical new energy transmission system. The relationship between transient overvoltage with SVG reactive power response was analyzed. Furthermore

the defect of exiting control strategy was revealed. From the perspective of operation logic and judging criterion

the optimization method of SVG control strategy

which was verified by simulating calculation

was proposed. Based on the analysis

the open-phase control mode of SVG is set in order to suppress the transient overvoltage after single-phase earthing fault. The unbalance of three phase voltage in SVG terminal can be used as the entering and exiting criteria of the open-phase mode. By maintaining the reactive current of SVG in a low level during open-phase operation

the transient overvoltage can be effectively suppressed.

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Keywords

references

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