Fixed switching frequency predictive control of an asymmetric source dual inverter system with a floating bridge for multilevel operation

Abstract

This study proposes a modified modulated model predictive control (MMPC) scheme to control an open-end winding induction motor drive using an asymmetric source dual inverter with one floating bridge. The control algorithm uses a modulation algorithm within the cost function optimisation scheme to avoid variable switching frequency. The voltage of the floating capacitor is regulated utilising predefined redundant switching sequences as well as the voltage vector location is identified to improve calculation time. The proposed MMPC scheme enhances the output performance with comparison to the model predictive control scheme. Experimental results are presented to verify theory and simulation results.

An Enhanced Unified Space Vector Modulation Technique for Dual Converters with Isolated Voltage Supplies

“…Two different speed references are considered, which result in as many modulation indexes (M.I. ), as defined in (5). From Fig.…”

“…According to their power supply arrangement, the dual converters generally feature three different configurations, which are dual converters with 1) isolated supplies, 2) one common source and 3) a floating bridge [1], [5]. The dual converter using a common voltage source requires to eliminate the zero-sequence current, while the dual converter with a floating bridge demands to regulate the capacitor voltage at the desired value.…”

Reduced voltage stress hybrid multilevel inverter using optimised predictive control

“…This is because the switching pattern that has to be generated is re‐calculated after each sampling time. However, recent progress in computational capabilities has overcome this setback and has thus, paved the way to make the best use of this control strategy [17–24].…”

Voltage Utilization Enhancement of Dual Inverters by Model Predictive Control for Motor Drive Applications

“…Regarding the dual converter with FC, one of research hotspots is investigating the suitable approach to enhance the voltage utilization of DC-link [4]- [7]. This is extremely critical for the motor drive applications [8].…”

“…For instance, an MPC technique for dual converters is described in [5] and an enhanced technique with fixed switching frequency is proposed in [7]. However, the voltage utilization of DC-link by MPC has not been considered in the previous paper.…”