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A new capacitor voltage balancing method for trapezoidal operation of modular multilevel DC-DC converters

Saleh, Beeond M.; Costabeber, Alessandro; Watson, Alan; Tardelli, Francesco; Clare, Jon

Authors

Beeond M. Saleh

Alessandro Costabeber

Francesco Tardelli

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JON CLARE jon.clare@nottingham.ac.uk
Professor of Power Electronics



Abstract

© 2019 EPE Association. In this paper, a new submodule (SM) capacitor voltage balancing algorithm is proposed for the trapezoidal operation of a Modular Multilevel DC-DC converter (MMC-DC-DC) for HVDC/MVDC. Trapezoidal wave-shaping leads to SM switching at fundamental frequency, making the balancing process more challenging. In the proposed method, balancing is achieved by controlling the equivalent duty-cycle of each SM. This control is made possible by the exploitation of the ramps in the trapezoidal voltage waveforms, that allow to impose an uneven power flow in the different SMs. The proposed balancing has been validated in PLECS simulation for a 10MW, 20kV 20kV MMC-DC-DC converter.

Citation

Saleh, B. M., Costabeber, A., Watson, A., Tardelli, F., & Clare, J. (2019). A new capacitor voltage balancing method for trapezoidal operation of modular multilevel DC-DC converters. In 2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe)https://doi.org/10.23919/EPE.2019.8915177

Conference Name 21st European Conference on Power Electronics and Applications (EPE 2019 ECCE Europe)
Start Date Sep 3, 2019
End Date Sep 5, 2019
Acceptance Date Mar 1, 2019
Online Publication Date Sep 5, 2019
Publication Date Nov 28, 2019
Deposit Date Mar 3, 2020
Publicly Available Date Mar 11, 2020
Book Title 2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe)
ISBN 9789075815313
DOI https://doi.org/10.23919/EPE.2019.8915177
Public URL https://nottingham-repository.worktribe.com/output/3660288
Publisher URL https://ieeexplore.ieee.org/document/8915177
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.

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