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Experimental validation of dual H-Bridge current flow controllers for meshed HVdc grids

Balasubramaniam, Senthooran, Ugalde Loo, Carlos E. ORCID:, Liang, Jun ORCID:, Joseph, Tibin ORCID:, King, Rose and Adamczyk, Andrzej 2018. Experimental validation of dual H-Bridge current flow controllers for meshed HVdc grids. IEEE Transactions on Power Delivery 33 (1) , pp. 381-392. 10.1109/TPWRD.2017.2752301

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The current carrying capability of dc lines is limited by their thermal and electric stress limits. Thus, the line current must be maintained within the permissible operational region to protect the lines from damages. In a dense dc grid, control over each line current cannot be achieved without including additional control devices. In this paper a dual H-bridge current flow controller (2B-CFC) is used to manage the dc grid line power flow by providing dc voltage compensation in series with dc lines. A centralized hierarchical control system is proposed to coordinate the operation between multiple CFCs. A novel voltage sharing control scheme is demonstrated. It is shown that such scheme reduces the workload on a single CFC by sharing the required control voltage between multiple CFCs, and, additionally, can be used to avoid control conflicts among active CFCs during communication failure. An experimental platform consisting on a 3-terminal dc grid and small scale 2B-CFC prototypes has been developed to validate the concepts. For completeness, the CFC performance has been analyzed for overload conditions and when no communication exists. Small-scale dc circuit breakers have been developed to study the CFC performance under a pole-to-pole fault.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Additional Information: This is an open access article under the terms of the CC-BY Attribution 4.0 International license.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
ISSN: 0885-8977
Date of First Compliant Deposit: 27 September 2017
Date of Acceptance: 26 August 2017
Last Modified: 09 May 2023 17:33

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