A Modified Voltage Balancing Algorithm for the Modular Multilevel Converter: Evaluation for Staircase and Phase-Disposition PWM

PROJECT TITLE :

A Modified Voltage Balancing Algorithm for the Modular Multilevel Converter: Evaluation for Staircase and Phase-Disposition PWM

ABSTRACT:

This paper introduces a coffee complexity implementation of the voltage balancing algorithm aiming to reduce the switching frequency of the power devices in modular multilevel converters (MMCs). The proposed algorithm options a relatively simple implementation while not any conditional execution needs and is well expandable irrespective of the number of submodules (SMs). Two modulation techniques are evaluated, specifically the staircase modulation and therefore the part-disposition pulse width modulation (PD-PWM) below the standard and therefore the proposed algorithm. Employing a circulating current controller in an MMC with twelve SMs per arm, PD-PWM yields better results compared to the staircase modulation technique. The take a look at condition for this comparison is such that the ability devices operate at an identical switching frequency and manufacture similar amplitudes to the capacitor voltage ripples in each modulation techniques. The results are verified through intensive simulations and experiments on a low power section-leg MMC laboratory prototype.

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