Lookup NU author(s): Osama Abushafa,
Dr Shady Gadoue,
Dr Mohamed Dahidah,
Dr Dave Atkinson,
Dr Petros Missailidis
This is the authors' accepted manuscript of an article that has been published in its final definitive form by IEEE, 2018.
For re-use rights please refer to the publisher's terms and conditions.
This paper presents a new method to measure the voltage across the submodule (SM) capacitors in a modular multilevel converter (MMC). The proposed technique requires only one voltage sensor per arm. This reduces the number of sensors required compared to conventional sensor-based methods. Therefore, the cost and complexity of the system are reduced, which in turn improves the converter’s overall reliability. The proposed method employs an exponentially weighted recursive least square (ERLS) algorithm to estimate the SM capacitor voltages through the measured total arm voltage and the switching patterns of each SM. There is thus no need for extra sensors to measure these control signals as they are directly provided from the controller. The robustness of the proposed method is confirmed via introducing deviations for the capacitance values, dynamic load changes, DC voltage change and start-up transient condition. Simulation and experimentally validated results based on a single-phase MMC show the effectiveness of the proposed method in both, steady-state and dynamic operations.
Author(s): Abushafa O, Gadoue S, Dahidah MSA, Atkinson D, Missailidis P
Publication type: Article
Publication status: Published
Journal: IEEE Journal of Emerging and Selected Topics in Power Electronics
Print publication date: 01/12/2018
Online publication date: 24/01/2018
Acceptance date: 04/01/2018
ISSN (print): 2168-6777
ISSN (electronic): 2168-6785
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