Analytical calculation models for bipolar MMC-HVDC systems under valve-side single-phase-to-ground faults

Sun, Pingyang, Li, Gen, Zhang, Hanwen, Liang, Jun ORCID: https://orcid.org/0000-0001-7511-449X and Konstantinou, Georgios 2025. Analytical calculation models for bipolar MMC-HVDC systems under valve-side single-phase-to-ground faults. IEEE Transactions on Power Delivery 10.1109/tpwrd.2025.3535703

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Abstract

This paper proposes two analytical valve-side single-phase-to-ground (SPG) fault calculation models for bipolar modular multilevel converter-based high-voltage direct current (MMC-HVDC) system. The first model is applicable to the half-bridge submodule (HBSM) configuration, and the second is suitable for the full-bridge submodules (FBSMs) or hybrid SMs with different FBSM ratios. In each calculation model, two post-fault equivalent MMC circuits are established following converter blocking for the independent study of the upper and lower arms. The detailed expression of the post-fault voltages and currents in each arm, valve-side, and grid-side are obtained from the proposed calculation models. Moreover, the applicability of the calculation models for solid, inductive, and resistive dc-grounding methods is also demonstrated, along with a further discussion on the influence of MMC arm/grid-side resistance as well as varying fault-grounding impedance. Multiple bipolar MMC-HVDC systems, incorporating HBSM, FBSM, and hybrid SM configurations, are developed in PSCAD/EMTDC to validate the accuracy of the proposed analytical calculation models.

Item Type:	Article
Date Type:	Published Online
Status:	In Press
Schools:	Engineering
Additional Information:	License information from Publisher: LICENSE 1: URL: https://ieeexplore.ieee.org/Xplorehelp/downloads/license-information/IEEE.html, Start Date: 2025-01-01
Publisher:	Institute of Electrical and Electronics Engineers
ISSN:	0885-8977
Last Modified:	12 Feb 2025 11:15
URI:	https://orca.cardiff.ac.uk/id/eprint/176113

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