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Level-shift modulation and control of a dual H-bridge current flow controller in meshed HVDC systems

Liu, Wei, Liang, Jun ORCID:, Ugalde-Loo, Carlos ORCID:, Li, Chuanyue ORCID:, Li, Gen ORCID: and Yang, Peng ORCID: 2019. Level-shift modulation and control of a dual H-bridge current flow controller in meshed HVDC systems. Presented at: 11th Energy Conversion Congress and Exposition (ECCE), Baltimore, MD, USA, 29 September - 3 October 2019. 2019 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, pp. 62-66. 10.1109/ECCE.2019.8912857

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The dual H-bridge current flow controller (CFC) has been proposed as a cost-effective solution to regulate current flows in a meshed high-voltage direct-current (HVDC) system. With an interline connection, this device may increase or decrease the magnitude and even reverse the directions of transmission line currents in a meshed dc grid. However, it needs to be modulated in a different manner when its operating region changes, which makes its control more complex. This paper investigates a modulation method for the dual H-bridge CFC. The buck and boost regions of operation for the device are analyzed first. A level-shift modulation method based on pulse width modulation is proposed. This method ensures that only one bridge of the CFC is switching for each operating region, which simplifies the control of the device. In addition, the method ensures a smooth transition between the operating regions, which can enhance the reliability of the CFC. For completeness, the presented modulation and control methods are verified through time-domain simulations conducted in PSACD/EMTDC.

Item Type: Conference or Workshop Item (Paper)
Date Type: Published Online
Status: Published
Schools: Engineering
Additional Information: "© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works."
Publisher: IEEE
ISBN: 9781728103952
Date of First Compliant Deposit: 22 January 2021
Last Modified: 11 Mar 2023 02:55

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