Novel Three-Phase AC/DC Converter with High Power Factor

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Novel Three-Phase AC/DC Converter with High Power Factor

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The paper presents a three-phase AC/DC converter to achieve power-factor correction, harmonics elimination, DC-bus-voltage regulation and neutral-point-voltage compensation. The proposed converter can achieve bidirectional power-flow capability. Therefore the converter can be applied for active power-filter operation. Two legs are adopted in the proposed converter to achieve three-level pulse-width modulation (PWM) and control the line currents to be sinusoidal waves in phase with supply voltages. Three control loops, DC-link-voltage control, neutral-point-voltage compensation and line current control, were used in the control scheme to achieve DC-bus-voltage regulation, to balance neutral-point voltage and to draw the sinusoidal line currents. The mathematical model of the converter was derived and the control scheme is provided. The effectiveness of the proposed control scheme is verified through computer simulation and experiments.

Inspec keywords: PWM power convertors; AC-DC power convertors; power conversion harmonics; power factor correction; electric current control; harmonics suppression; digital simulation; load flow; voltage control

Other keywords: bidirectional power-flow capability; three-level pulse-width modulation; harmonics elimination; mathematical model; three-phase AC-DC Converter; neutral-point-voltage compensation; computer simulation; sinusoidal line currents; active power-filter; high power factor correction; DC-link-voltage control; PWM; line current control; DC-bus-voltage regulation

Subjects: Current control; Power convertors and power supplies to apparatus; Control of electric power systems; Power electronics, supply and supervisory circuits; Voltage control

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