Transient Stability Enhancement of Grid-forming Inverter-based Resources by Optimizing Angle of Saturated Current

Ali Arjomandi-Nezhad; Bikash C. Pal

doi:10.35833/MPCE.2024.001292

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Transient Stability Enhancement of Grid-forming Inverter-based Resources by Optimizing Angle of Saturated Current

Original Paper | 更新时间：2026-09-28

- Transient Stability Enhancement of Grid-forming Inverter-based Resources by Optimizing Angle of Saturated Current
- Journal of Modern Power Systems and Clean Energy Vol. 14, Issue 5, Pages: 1647-1658(2026)
- 作者机构：
  
  Department of Electrical and Electronics Engineering at Imperial College London, London SW7 2AZ, United Kingdom
- 作者简介：
- 基金信息：
- DOI：10.35833/MPCE.2024.001292
  CLC：
- Received：04 December 2024，
  
  Revised：2025-03-07，
  
  Accepted：27 June 2025，
  
  Online First：29 December 2025，
  
  Published：15 September 2026
- 稿件说明：
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Arjomandi-Nezhad Ali,Pal Bikash C..Transient Stability Enhancement of Grid-forming Inverter-based Resources by Optimizing Angle of Saturated Current[J].Journal of Modern Power Systems and Clean Energy,2026,14(05):1647-1658.
DOI：

Arjomandi-Nezhad Ali,Pal Bikash C..Transient Stability Enhancement of Grid-forming Inverter-based Resources by Optimizing Angle of Saturated Current[J].Journal of Modern Power Systems and Clean Energy,2026,14(05):1647-1658. DOI： 10.35833/MPCE.2024.001292.

摘要

Abstract

The current saturation challenges the transient stability of grid-forming (GFM) inverter-based resources (IBRs) during large disturbances by introducing the current-saturated stable equilibrium point (CS-SEP). Convergence into the post-fault CS-SEP is an undesired post-disturbance scenario. The angle of the saturated current significantly affects the post-disturbance trajectory. Moreover

the voltage immediately after the converter returns to the normal operation mode depends on this angle. If the difference between this voltage and the reference voltage is large

huge power oscillations occur superimposed on the second-order power swing. The voltage-error-induced power oscillation appears as a disturbance on the active power control loop and affects transient stability. In this paper

the angle of the saturated current is adjusted to minimize the voltage error immediately after the GFM IBR returns to the normal operation mode and prevent the convergence into CS-SEP. To do so

a closed-form expression for the angle of the saturated current at which the voltage transient is minimized is derived in the first stage. Then

an optimization is formulated to minimize the deviation of the angle of the saturated current from the angle calculated in the first stage while ensuring that CS-SEP convergence is avoided. This optimal control method

which enhances transient stability by adaptively tuning the angle of the saturated current

is validated through simulation.

关键词

Keywords

references

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