Hierarchical energy control of MMC-MTDC system integrated with offshore wind farms for optimal frequency support provision

Zhang, Haobo, Xiang, Wang, Wang, Yining, Xu, Yan and Wen, Jinyu 2025. Hierarchical energy control of MMC-MTDC system integrated with offshore wind farms for optimal frequency support provision. IEEE Transactions on Power Delivery 10.1109/TPWRD.2025.3622732

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Abstract

This paper proposes an energy coordination control scheme for offshore wind farms (OWFs) integrated modular multilevel converter-based multi-terminal direct current (MMC-MTDC) system towards enhanced grid frequency support. First, a two-layer hierarchical energy control framework is established. At the lower layer, a local energy coordination controller is designed to directly regulate OWF rotor kinetic energy and MMC capacitor energy by using local measurements, eliminating energy utilization errors. At the upper layer, an energy optimization method is developed to dispatch multiple energy for achieving optimal energy utilization and minimizing grid frequency deviations. In addition, a multi-stage energy recovery strategy is designed, ensuring frequency stability during the recovery process and enabling the OWFs-MTDC system to support multiple successive frequency events. Finally, the effectiveness and robustness of the proposed method are verified in a test system jointly built in PSCAD/EMTDC and MATLAB.

Item Type:	Article
Date Type:	Published Online
Status:	In Press
Schools:	Schools > Engineering ?? AHVER ??
Publisher:	Institute of Electrical and Electronics Engineers
ISSN:	0885-8977
Last Modified:	22 Oct 2025 09:15
URI:	https://orca.cardiff.ac.uk/id/eprint/181751

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