A Diode-MMC AC/DC Hub for Connecting Offshore Wind Farm and Offshore Production Platform

Kai Huang, Lie Xu and Guangchen Liu
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Kai Huang: Institute for Energy and Environment, University of Strathclyde, Glasgow G1 1XW, UK
Lie Xu: Institute for Energy and Environment, University of Strathclyde, Glasgow G1 1XW, UK
Guangchen Liu: Department of Electrical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China

Energies, 2021, vol. 14, issue 13, 1-16

Abstract: A diode rectifier-modular multilevel converter AC/DC hub (DR-MMC Hub) is proposed to integrate offshore wind power to the onshore DC network and offshore production platforms (e.g., oil/gas and hydrogen production plants) with different DC voltage levels. The DR and MMCs are connected in parallel at the offshore AC collection network to integrate offshore wind power, and in series at the DC terminals of the offshore production platform and the onshore DC network. Compared with conventional parallel-connected DR-MMC HVDC systems, the proposed DR-MMC hub reduces the required MMC converter rating, leading to lower investment cost and power loss. System control of the DR-MMC AC/DC hub is designed based on the operation requirements of the offshore production platform, considering different control modes (power control or DC voltage control). System behaviors and requirements during AC and DC faults are investigated, and hybrid MMCs with half-bridge and full-bridge sub-modules (HBSMs and FBSMs) are used for safe operation during DC faults. Simulation results based on PSCAD/EMTDC validate the operation of the DR-MMC hub.

Keywords: DC network; HVDC transmission; modular multilevel converter; diode rectifier; offshore oil/gas platform; offshore production; offshore wind power (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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