The Study of Multi-Terminal DC Systems in an Offshore Wind Environment: A Focus on Cable Ripple Analysis

Xiaoyun Rong (), Jonathan K. H. Shek, D. Ewen Macpherson and Phil Mawby
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Xiaoyun Rong: School of Engineering, University of Warwick, Library Rd., Coventry CV4 7AL, UK
Jonathan K. H. Shek: Institute for Energy Systems, School of Engineering, University of Edinburgh, Edinburgh EH9 3JL, UK
D. Ewen Macpherson: Institute for Energy Systems, School of Engineering, University of Edinburgh, Edinburgh EH9 3JL, UK
Phil Mawby: School of Engineering, University of Warwick, Library Rd., Coventry CV4 7AL, UK

Energies, 2024, vol. 17, issue 8, 1-27

Abstract: This paper studies the THD and AC losses on the DC cables of offshore wind farm-based multi-terminal HVDC systems when they extract and deliver power from and to more than one connection point. In the paper, the study of a full system PLECS + Simulink model with two branches, including a wind resource, a wind turbine, a Permanent Magnet Synchronous Generator (PMSG), a Pulse Width Modulation (PWM) rectifier, a Single Active Bridge (SAB) DC–DC converter, an Input Parallel Output Series (IPOS) DC–DC converter, HVDC cables, and a simplified onshore system, is presented. It focuses on the investigation of the output ripple content of multiple DC–DC converters on DC cables under different wind conditions with different voltage and power ratings. The importance of the study is providing a general understanding of the operation of the innovative offshore wind farm-based DC system, as well as the interaction between different DC–DC converters and their influence on cable ripple content under different situations.

Keywords: DC–DC converter; THD; AC losses; control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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