Transient Stability Analysis and Adaptive Limiting Method of Grid-forming Converters Considering Current Limitation

HE Hongliang; XIAO Huangqing; ZHANG Lidong

doi:10.7500/AEPS20240628004

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Transient Stability Analysis and Adaptive Limiting Method of Grid-forming Converters Considering Current Limitation

Grid-forming Technology | 更新时间：2025-06-16

- Transient Stability Analysis and Adaptive Limiting Method of Grid-forming Converters Considering Current Limitation
- Automation of Electric Power Systems Vol. 49, Issue 2, Pages: 30-40(2025)
- 作者机构：
  
  1.华南理工大学电力学院，广东省广州市 510640
  2.南方电网科学研究院有限责任公司，广东省广州市 510663
- 作者简介：
- 基金信息：
  
  Guangdong Provincial Basic and Applied Basic Research Foundation of China(2023A1515111125)
- DOI：10.7500/AEPS20240628004
  CLC：
- Received：28 June 2024，
  
  Revised：2024-12-01，
  
  Published Online：23 December 2024，
  
  Published：25 January 2025
- 稿件说明：
移动端阅览
何宏亮,肖晃庆,张利东.考虑电流限幅的构网型变流器暂态稳定分析与自适应限幅方法[J].电力系统自动化,2025,49(2):30-40.

HE Hongliang,XIAO Huangqing,ZHANG Lidong.Transient Stability Analysis and Adaptive Limiting Method of Grid-forming Converters Considering Current Limitation[J].Automation of Electric Power Systems,2025,49(2):30-40.
何宏亮,肖晃庆,张利东.考虑电流限幅的构网型变流器暂态稳定分析与自适应限幅方法[J].电力系统自动化,2025,49(2):30-40. DOI： 10.7500/AEPS20240628004.

HE Hongliang,XIAO Huangqing,ZHANG Lidong.Transient Stability Analysis and Adaptive Limiting Method of Grid-forming Converters Considering Current Limitation[J].Automation of Electric Power Systems,2025,49(2):30-40. DOI： 10.7500/AEPS20240628004.

摘要

电流限幅环节的引入深刻改变了构网型变流器的暂态同步机制与动态特性。为研究大扰动故障下电流限幅环节对构网型变流器暂态同步稳定性的影响，基于功角特性曲线分析了传统

轴优先限幅策略在故障条件下的动态特性。在电网电压暂降且未及时切除故障的工况下，变流器将会“锁死”在限幅控制模式。针对这一问题，提出一种自适应限幅方法，引入自适应系数调整限幅状态下构网型变流器的功角特性曲线。首先，确定自适应系数的取值范围，以保证变流器在各工况下均能恢复正常运行状态。然后，采用等面积法则选取自适应系数最优取值，使变流器获得最大极限切除角和极限切除时间。最后，通过PSCAD/EMTDC仿真验证了理论分析的正确性以及自适应限幅控制策略的有效性。

Abstract

The introduction of current limitation link significantly changes the transient synchronization mechanism and dynamic characteristics of grid-forming converters. In order to study the influence of current limitation link on the transient synchronization stability of grid-forming converters under large disturbance faults

the dynamic characteristics of the traditional

-axis priority limiting strategy under fault conditions are analyzed based on the power-angle curve. In the condition that the power grid voltage dips and the fault is not removed in time

the converter will "lock" in the limiting control

mode. To address this issue

an adaptive limiting method is proposed

and the adaptive coefficient is introduced to adjust the power-angle curve of the grid-forming converter in the limiting state. First

the range of values for the adaptive coefficient is determined to ensure that the converter can return to normal operation state in various conditions. Then

the optimal value of the adaptive coefficient is selected using the equal-area criterion

so that the converter can obtain the maximum critical clearing angle and critical clearing time. Finally

the correctness of the theoretical analysis and the effectiveness of the adaptive limiting control strategy are verified through PSCAD/EMTDC simulations.

关键词

Keywords

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