电网故障情况下构网型换流器过电流抑制策略

石桢; 陈来军; 苏小玲; 赵正奎; 梅生伟

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电网故障情况下构网型换流器过电流抑制策略

更新时间：2025-04-18

- 电网故障情况下构网型换流器过电流抑制策略
- Overcurrent Suppression Strategies for Grid-Forming Converters under Power Grid Fault
- 默认刊物名称 2025年
- 作者机构：
  
  1.新能源电力系统智慧运行教育部重点实验室(青海大学能源与电气工程学院),青海省西宁市810016
  2.清华大学电机工程与应用电子技术系,北京市北京市100084
- 作者简介：
  
  [ "石桢(1999-)，男，硕士，主要研究方向为新能源电力系统稳定与控制，" ]
  [ "苏小玲(1986-)，女，博士，副教授，主要研究方向为新能源发电并网优化控制、综合能源系统，" ]
- 基金信息：
  
  国家自然科学基金(52167022);青海省基础研究计划项目(2022-ZJ-935Q)
- DOI：
  中图分类号：
- 收稿日期：2024-07-05，
  
  修回日期：2024-07-28，
  
  录用日期：2024-07-31，
- 稿件说明：
移动端阅览
石桢, 陈来军, 苏小玲, 等. 电网故障情况下构网型换流器过电流抑制策略[J/OL]. 默认刊物名称, 2025.

SHI Zhen, CHEN Laijun, SU Xiaoling, et al. Overcurrent Suppression Strategies for Grid-Forming Converters under Power Grid Fault[J/OL]. Moren journal, 2025.
石桢, 陈来军, 苏小玲, 等. 电网故障情况下构网型换流器过电流抑制策略[J/OL]. 默认刊物名称, 2025. DOI：

SHI Zhen, CHEN Laijun, SU Xiaoling, et al. Overcurrent Suppression Strategies for Grid-Forming Converters under Power Grid Fault[J/OL]. Moren journal, 2025. DOI：

摘要

构网型换流器具有电压源特性，可主动支撑电网。但在电网故障情况下，为保持其输出电压的稳定，极易导致换流器过电流而触发过流保护，甚至损坏电力电子器件。为此，基于故障电流动态响应机理，建立了故障电流解析表达式，该故障电流解析表达式由随时间衰减的暂态电流分量、随时间周期性变化的稳态电流分量组成，根据不同分量特点，分析其关键影响参数，提出一种分别对针对过电流稳态分量和暂态分量进行抑制的构网型换流器过电流抑制策略。仿真和实验结果表明，所提策略可使故障期间构网型换流器保留电压源特性，主动支撑电网电压，同时抑制稳态过电流和暂态过电流，使电流始终保持在安全阈值之内，并保持功角稳定。

Abstract

Grid-forming converters possess the characteristics of a voltage source and can actively support the power grid. However

in the event of a power grid fault

in order to maintain the stability of its output voltage

the converter is highly susceptible to overcurrent

which can trigger overcurrent protection and potentially damage power electronic components. To address this problem

based on the dynamic response mechanism of fault current

a analytical expression for fault current has been established. This analytical expression of fault current is composed of a transient current component that decays over time and a steady-state current component that varies periodically with time. Based on the characteristics of different components

key influencing parameters are analyzed

and a grid-forming converter overcurrent suppression strategy is proposed

which targets the suppression of both the steady-state and transient components of the overcurrent. Simulation and experimental results demonstrate that the proposed strategy allows the grid-forming converter to retain its voltage source characteristics during fault periods

actively support the grid voltage

and simultaneously suppress both steady-state and transient overcurrents

ensuring that the current remains within safe thresholds and maintaining the stability of the power angle.

关键词

Keywords

references

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