Title :
Novel single-phase switching mode multilevel rectifier with a high power factor
Author :
Lin, B.-R. ; Yang, T.-Y.
Author_Institution :
Dept. of Electr. Eng., Nat. Yunlin Univ. of Sci. & Technol., Touliu City, Taiwan
fDate :
5/1/2005 12:00:00 AM
Abstract :
A single-phase switching mode multilevel rectifier is presented in order to improve the power factor, reduce current harmonics and regulate the DC-bus voltage. The adopted rectifier can achieve a bi-directional power-flow capability. The sinusoidal line current with fewer harmonics can be drawn from the AC mains. Six active switches are used in the proposed rectifier to achieve three-level pulse-width modulated operation. Two rectifier legs are used in the adopted rectifier. The rectifier´s leg-a is operated at the carrier frequency and the rectifier´s leg-b is operated at the line frequency. With using an appropriate control scheme, three voltage levels and two voltage levels are generated on the rectifier´s leg-a and leg-b, respectively. Two control loops are adopted in the control scheme to achieve line current command tracking and DC-link voltage regulation. The carrier-based current controller is adopted in the inner loop to draw a sinusoidal line current form the AC source. A voltage controller based on a proportional-integral scheme is used in the outer loop to obtain a constant DC-link voltage. A neutral point voltage compensator is adopted in the system to balance the capacitor voltages on the DC side. Based on the proposed control scheme, a three-level pulse-width modulated waveform is generated on the AC terminal of the rectifier. Computer simulation and experimental results are provided to verify the performance of the control scheme.
Keywords :
PI control; PWM power convertors; electric current control; harmonics suppression; power factor correction; rectifying circuits; switching convertors; voltage control; DC-bus voltage regulation; bi-directional power-flow; carrier-based current controller; current harmonics; neutral point voltage compensator; power factor correction; proportional-integral voltage controller; single-phase switching multilevel rectifier; three-level pulse-width modulated;
Journal_Title :
Electric Power Applications, IEE Proceedings -
DOI :
10.1049/ip-epa:20040983