A modified voltage balancing sorting algorithm for the modular multilevel converter: Evaluation for staircase and phase-disposition PWM

Conference object English OPEN
Darus, Rosheila ; Pou Félix, Josep ; Konstantinou, Georgios ; Ceballos Recio, Salvador ; Agelidis, Vassilios (2014)
  • Related identifiers: doi: 10.1109/APEC.2014.6803318
  • Subject: Electric currents | Corrents elèctrics | Modulació (Electrònica) | Pulse-width modulation | :Enginyeria electrònica [Àrees temàtiques de la UPC] | Modular multilevel converter | Modulation technique | Modulation (Electronics) | Rotary converters | Capacitor voltage balancing | Convertidors rotatius

This paper introduces a low complexity implementation of the voltage balancing sorting algorithm to reduce the switching frequency of the power devices in modular multilevel converters (MMCs). Two modulation techniques are evaluated; staircase modulation and phase-disposition pulse-width modulation (PD-PWM) under the conventional and the proposed algorithm. Using a circulating current controller in an MMC with 12 sub-modules per arm, PD-PWM yields better results compared to the staircase modulation technique. The test condition for this comparison is such that the power devices operate at a similar switching frequency and produce similar amplitudes to the capacitor voltage ripples in both modulation techniques. The results are verified through extensive simulations and experimentally using a phase-leg MMC laboratory prototype. Peer Reviewed
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