A Single-Input Single-Output Approach by using Minor-Loop Voltage Feedback Compensation with Modified SPWM Technique for Three-Phase AC-DC Buck Converter

Azrita Alias; Nasrudin Abd. Rahim; Mohamed Azlan Hussain

A Single-Input Single-Output Approach by using Minor-Loop Voltage Feedback Compensation with Modified SPWM Technique for Three-Phase AC-DC Buck Converter

Azrita Alias

Nasrudin Abd. Rahim

Mohamed Azlan Hussain

Vol. 13, No. 5, pp. 829-840, Sep. 2013

10.6113/JPE.2013.13.5.829

MATLAB-Simulink

Minor-loop feedback compensator

Modified SPWM

Three-phase AC?DC buck converter

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Abstract

The modified sinusoidal pulse-width modulation (SPWM) is one of the PWM techniques used in three-phase AC?DC buck converters. The modified SPWM works without the current sensor (the converter is current sensorless), improves production of sinusoidal AC current, enables obtainment of near-unity power factor, and controls output voltage through modulation gain (ranging from 0 to 1). The main problem of the modified SPWM is the huge starting current and voltage (during transient) that results from a large step change from the reference voltage. When the load changes, the output voltage significantly drops (through switching losses and non-ideal converter elements). The single-input single-output (SISO) approach with minor-loop voltage feedback controller presented here overcomes this problem. This approach is created on a theoretical linear model and verified by discrete-model simulation on MATLAB/Simulink. The capability and effectiveness of the SISO approach in compensating start-up current/voltage and in achieving zero steady-state error were tested for transient cases with step-changed load and step-changed reference voltage for linear and non-linear loads. Tests were done to analyze the transient performance against various controller gains. An experiment prototype was also developed for verification.

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Cite this article

[IEEE Style]

A. Alias, N. A. Rahim, M. A. Hussain, "A Single-Input Single-Output Approach by using Minor-Loop Voltage Feedback Compensation with Modified SPWM Technique for Three-Phase AC-DC Buck Converter," Journal of Power Electronics, vol. 13, no. 5, pp. 829-840, 2013. DOI: 10.6113/JPE.2013.13.5.829.

[ACM Style]

Azrita Alias, Nasrudin Abd. Rahim, and Mohamed Azlan Hussain. 2013. A Single-Input Single-Output Approach by using Minor-Loop Voltage Feedback Compensation with Modified SPWM Technique for Three-Phase AC-DC Buck Converter. Journal of Power Electronics, 13, 5, (2013), 829-840. DOI: 10.6113/JPE.2013.13.5.829.