Comparative analysis of VSC-HVDC converters under phase jumps, frequency change, and short-circuit faults

Gong, Qingyuan, Li, Chuanyue ORCID: https://orcid.org/0000-0001-6835-6642, Zhou, Xiaoyao and Liang, Jun ORCID: https://orcid.org/0000-0001-7511-449X 2025. Comparative analysis of VSC-HVDC converters under phase jumps, frequency change, and short-circuit faults. Presented at: 22nd IET International Conference on AC and DC Power Transmission (ACDC Global 2025), Birmingham, UK, 17-19 Mar 2025. IET Conference Proceedings. , vol.2025 (6) Institution of Engineering and Technology (IET), 10.1049/icp.2025.1202 Item availability restricted.

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Abstract

Voltage source converters (VSCs) are essential for integrating renewable energy into modern power systems. VSC-HVDC systems will take part in grid-forming capabilities in the future. This paper investigates the response of grid-forming VSCs to three AC-side disturbances: phase jump, rate of change of frequency (RoCoF), and short-circuit fault. Phase jumps and RoCoF both cause phase angle changes, but they lead to different dynamics of active power. Phase jumps and short-circuit faults are compared based on transient current and energy imbalance. The current-limiting control with virtual impedance is evaluated for managing the overcurrent during disturbances. The results show that it effectively mitigates overcurrent caused by both phase jumps and short-circuit faults. The findings highlight the similarities and distinctions among phase jumps, RoCoF, and short-circuit faults, contributing to the understanding of grid-forming capability specifications and control strategy design for VSC-HVDC systems.

Item Type:	Conference or Workshop Item (Speech)
Date Type:	Published Online
Status:	Published
Schools:	Schools > Engineering
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Uncontrolled Keywords:	grid-forming VSC, phase jump, rate of change of frequency (RoCoF), voltage dip, current-limiting control
Publisher:	Institution of Engineering and Technology (IET)
Date of First Compliant Deposit:	30 June 2025
Date of Acceptance:	12 February 2025
Last Modified:	10 Jul 2025 10:15
URI:	https://orca.cardiff.ac.uk/id/eprint/179429

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