A Single-Input Single-Output Approach by using Minor-Loop Voltage Feedback Compensation with Modified SPWM Technique for Three-Phase AC–DC Buck Converter
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 pow...
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Format: | Article |
Language: | English English English |
Published: |
Korean Institute of Power Electronics
2013
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Online Access: | http://eprints.utem.edu.my/id/eprint/11751/1/10_JPE-13-03-105_%281%29.pdf http://eprints.utem.edu.my/id/eprint/11751/2/10_JPE-13-03-105_%281%29.pdf http://eprints.utem.edu.my/id/eprint/11751/3/10_JPE-13-03-105_%281%29.pdf http://eprints.utem.edu.my/id/eprint/11751/ |
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Summary: | 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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