Transient stability enhancement method for grid-forming converter based on joint control of active and reactive power

Xia, Xiangyang, Zhao, Xiaoyue, Liang, Jun ORCID: https://orcid.org/0000-0001-7511-449X, Luo, Wenguang, Chen, Guiquan and Zheng, Hanfneg 2025. Transient stability enhancement method for grid-forming converter based on joint control of active and reactive power. Automation of Electric Power Systems 49 (11) , pp. 114-125. 10.7500/AEPS20240905002 Item availability restricted.

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Abstract

Aiming at the issues of transient power angle instability and fault current over-limit of grid-forming converters during the symmetrical fault of the power grid, this paper proposes a joint control method integrating second-order sliding mode control and adaptive voltage regulation. First, an improved integral sliding mode surface is introduced in the active power-frequency loop of the grid-forming converter, and a Lyapunov function is constructed. Based on the stability criterion, the output power control law is designed to strictly limit the fluctuation of output power angle of the converter during faults while considering power grid phase changes. Furthermore, the reactive power-voltage loop switching control is employed to provide stable reactive power for supporting the voltage at the point of common coupling, which ensures that fault currents are maintained within safe thresholds. Finally, simulation and experimental results show that the proposed strategy can effectively enhance the fault ride-through capability of grid-forming converters and the recovery rate after fault clearance under the condition of a severe voltage drop with phase jump in the power grid. Its refined active support characteristics are also applicable to complex conditions of high and low voltage ride-through.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Engineering
ISSN:	1000-1026
Date of First Compliant Deposit:	18 August 2025
Date of Acceptance:	30 December 2024
Last Modified:	18 Aug 2025 09:15
URI:	https://orca.cardiff.ac.uk/id/eprint/180184

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