Optimised phase disposition (PD) modulation of a modular multilevel converter using a state machine decoder

McGrath, B, Teixeira, C and Holmes, G 2015, 'Optimised phase disposition (PD) modulation of a modular multilevel converter using a state machine decoder', in 2015 IEEE Energy Conversion Congress and Exposition, Montreal, Canada, 20-24 Sept 2015, pp. 6368-6375.


Document type: Conference Paper
Collection: Conference Papers

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Title Optimised phase disposition (PD) modulation of a modular multilevel converter using a state machine decoder
Author(s) McGrath, B
Teixeira, C
Holmes, G
Year 2015
Conference name 2015 IEEE Energy Conversion Congress and Exposition
Conference location Montreal, Canada
Conference dates 20-24 Sept 2015
Proceedings title 2015 IEEE Energy Conversion Congress and Exposition
Publisher IEEE
Place of publication New Jersey, USA
Start page 6368
End page 6375
Total pages 8
Abstract This paper presents a theoretical harmonic analysis of phase disposition (PD) and phase shifted carrier (PSC) pulse width modulation (PWM) strategies for MMC converters. It is shown that when these strategies are implemented on a per MMC arm basis, their spectral performances converge because of cancellation of odd carrier sideband groups between each phase leg's arms. An improved PD modulation strategy is then presented that uses a single PD modulator for the entire phase leg, followed by a state machine decoder that evenly distributes switching pulses to all sub-modules across the phase leg upper and lower arms to balance the distribution of sub-module commutation events. The resulting strategy achieves optimum phase leg PD spectral performance, and also achieves natural voltage balancing of the MMC sub-modules. All theoretical findings are supported by simulation and experimental results obtained using a five level MMC prototype.
Subjects Industrial Electronics
Power and Energy Systems Engineering (excl. Renewable Power)
DOI - identifier 10.1109/ECCE.2015.7310552
Copyright notice © 2015 IEEE
ISBN 9781467371513
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