Title :
Source voltage sensorless estimation scheme for PWM rectifiers under unbalanced conditions
Author :
Song, Hong-Seok ; Joo, In-Won ; Nam, Kwanghee
Author_Institution :
Div. of Electr. & Comput. Eng., Pohang Univ. of Sci. & Technol., South Korea
Abstract :
A source voltage sensorless estimation scheme is proposed for a pulsewidth-modulation (PWM) rectifier in unbalanced circumstances. The negative sequence is accompanied by the unbalance among phases, and acts as an ac disturbance to a normal-mode estimator and controller. Hence, without considering voltage unbalance, a PWM rectifier yields a voltage ripple in the dc-link voltage and large reactive currents. With the proposed sensorless scheme, both positive and negative components are estimated separately by using a full- (or reduced-) order estimator. The feasibility of the proposed sensorless scheme is confirmed through computer simulation and experiment.
Keywords :
pulse width modulation; rectifiers; voltage control; voltage regulators; PWM rectifiers; ac disturbance; controller; large reactive currents; negative sequence; normal-mode estimator; pulsewidth-modulation rectifier; source voltage sensorless estimation scheme; unbalanced conditions; voltage ripple; Frequency; Phase estimation; Phase locked loops; Pulse width modulation; Reactive power control; Rectifiers; Sensorless control; Space vector pulse width modulation; State estimation; Voltage control;
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2003.819685