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Miniaturization of an Offshore Platform with Medium-Frequency Offshore Wind Farm and MMC-HVDC Technology

Department of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
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Author to whom correspondence should be addressed.
Academic Editor: Emilio Gomez-Lazaro
Energies 2021, 14(8), 2058; https://doi.org/10.3390/en14082058
Received: 15 March 2021 / Revised: 31 March 2021 / Accepted: 6 April 2021 / Published: 8 April 2021
Offshore wind power has great development potential, for which the key factors are reliable and economical wind farms and integration systems. This paper proposes a medium-frequency wind farm and MMC-HVDC integration system. In the proposed scheme, the operating frequency of the offshore wind farm and its power collection system is increased from the conventional 50/60 Hz rate to the medium-frequency range, i.e., 100–400 Hz; the offshore wind power is transmitted to the onshore grid via the modular multilevel converter-based high-voltage direct current transmission (MMC-HVDC). First, this paper explains the principles of the proposed scheme in terms of the system topology and control strategy aspects. Then, the impacts of increasing the offshore system operating frequency on the main parameters of the offshore station are discussed. As the frequency increases, it is shown that the actual value of the electrical equipment, such as the transformers, the arm inductors, and the SM capacitors of the rectifier MMC, can be reduced, which means smaller platforms are required for the step-up transformer station and the converter station. Then, the system operation characteristics are analyzed, with the results showing that the power losses in the system increase slightly with the increase of the offshore AC system frequency. Based on time domain simulation results from power systems computer aided design/electromagnetic transients including DC (PSCAD/EMTDC), it is noted that the dynamic behavior of the system is not significantly affected with the increase of the offshore AC system frequency in most scenarios. In this way, the technical feasibility of the proposed offshore platform miniaturization technology is proven. View Full-Text
Keywords: offshore wind farm; platform miniaturization; medium-frequency AC collection system; MMC-HVDC integration offshore wind farm; platform miniaturization; medium-frequency AC collection system; MMC-HVDC integration
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MDPI and ACS Style

Zhang, Z.; Tang, Y.; Xu, Z. Miniaturization of an Offshore Platform with Medium-Frequency Offshore Wind Farm and MMC-HVDC Technology. Energies 2021, 14, 2058. https://doi.org/10.3390/en14082058

AMA Style

Zhang Z, Tang Y, Xu Z. Miniaturization of an Offshore Platform with Medium-Frequency Offshore Wind Farm and MMC-HVDC Technology. Energies. 2021; 14(8):2058. https://doi.org/10.3390/en14082058

Chicago/Turabian Style

Zhang, Zheren; Tang, Yingjie; Xu, Zheng. 2021. "Miniaturization of an Offshore Platform with Medium-Frequency Offshore Wind Farm and MMC-HVDC Technology" Energies 14, no. 8: 2058. https://doi.org/10.3390/en14082058

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