Inner current control method for modular multilevel converter applied in motor drive

Abstract

This paper presents the modular multilevel converter as medium voltage motor driver. An investigation of the capacitor requirements is performed and a novel control method, based in the inner current control, is proposed. This method can ensure the capacitor balancing as well minimizes the harmonic current in the converter phases. The control method is evaluated by computational simulations of a three-phase driver of a 350 kW, 2.3 kV induction motor. The simulated results have proven the effectiveness of the control structure in the startup procedure and steady state operation.

Control scheme of modular multilevel converter for AC drive applications

“…From 2012, Ref. [10][11][12][13][14][15][16] present a low frequency fluctuation restrain algorithm which adds high frequency energy exchange between upper arm and lower arm. In fact, to operate at low frequency for MMC, two problems must be solved:…”

Hybrid three-phase multilevel inverter based ON NPC cascaded to half-bridge cells

“…The levels at the output voltages increase linearly with the increasing numbers of modules. The voltage balance control of the floating capacitors is necessary to keep the voltage level in each capacitor [14].…”