Three Switch Three Phase Inverter With Improved DC Voltage Utilization

TL;DR

This paper introduces a novel three-switch three-phase inverter that achieves sinusoidal line-to-line voltages without filters, enhances voltage utilization, and employs model predictive control for improved transient response, confirmed by experimental validation.

Contribution

It presents the first three-switch three-phase inverter with pure sinusoidal output and improved voltage utilization, using model predictive control for better transient response.

Findings

Pure sinusoidal line-to-line voltages without output filter

Enhanced voltage utilization compared to existing topologies

Successful experimental validation of the prototype

Abstract

This paper proposes a new DC-AC converter with a less number of semiconductor switches and therefore gate drive and control circuit components. A salient feature of this inverter is its pure sinusoidal line-to-line voltages with no need for output filter. Also, the proposed inverter improves the voltage utilization factor of the input dc supply compared to four-switch three-phase inverter (first best topology in the literature from the number of switches point of view) and standard six-switch inverter with sine PWM. The proposed inverter is capable of operating with a wide range of output voltages from zero to the full value of the dc input voltage by appropriately altering instantaneous duty-cycle. For the first time to our knowledge, in this paper, a three-phase universal inverter with only three power-switch has been proposed. For the purpose of providing a good compromise between fast transient response and stability, a model predictive controller is proposed. All the design expressions have been derived. A comparison with other DC-AC converters is given to show the merits of the proposed converter. Finally, satisfactory circuit operation is confirmed by experimental results from a laboratory prototype.