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Feasibility and reliability analysis of LCC DC grids and LCC/VSC hybrid DC grids

Li, Gen ORCID:, Liang, Jun ORCID:, Joseph, Tibin ORCID:, An, Ting, Lu, Jingjing, Szechtman, Marcio, Anderson, Bjarne and Zhuang, Qikai 2019. Feasibility and reliability analysis of LCC DC grids and LCC/VSC hybrid DC grids. IEEE Access 7 , pp. 22445-22456. 10.1109/ACCESS.2019.2898387

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Power system interconnections using high-voltage direct-current (HVDC) technologies between different areas can be an effective solution to enhance system efficiency and reliability. Particularly, the multi-terminal DC grids, that could balance and ensure resource adequacy, increase asset utilization and reduce costs. In this paper, the technical feasibility of building DC grids using the line commutated converter based (LCC) and voltage source converter based (VSC) HVDC technologies are discussed. Apart from presenting the technical challenges of building LCC DC grids and LCC/VSC hybrid DC grids, the reliability modeling and analysis of these DC grids are also presented. First, the detailed reliability model of the modular multi-level converters (MMCs) with series connected high-voltage and low-voltage bridges are developed. The active mode redundancy design is considered for the reliability model. To this end, a comprehensive whole system reliability model of the studied systems is developed. The reliability model of each subsystem is modeled in detail. Various reliability indices are calculated using this whole system reliability model. The impacts of the redundancy design of the MMCs on these indices are presented. The studies of this paper provide useful guidance for DC grid design and reliability analysis.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
ISSN: 2169-3536
Date of First Compliant Deposit: 12 February 2019
Date of Acceptance: 5 February 2019
Last Modified: 02 May 2023 22:49

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