Title :
Control Strategy for PWM Converter Based on Suppressing the DC-Side Harmonics
Author_Institution :
Sch. of Electron. & Electr. Eng., Birmingham Univ., Birmingham, UK
Abstract :
A novel control strategy is proposed to suppress the 2nd voltage harmonic in the DC side of a PWM rectifier when the grid supply is unbalanced. The control strategy described in the paper solves the problem of low-order harmonics generated by a PWM rectifier. The control system is divided into two symmetrical double closed-loop systems to control positive and negative-sequence current respectively. The simulation results verify the proposed control strategy in terms of efficiency, reliability and low-harmonics in the DC side. The new control system not only reduces DC-side voltage harmonics, but also improves the quality of the rectifier output voltage, and decreases the degree of asymmetry in the AC-side current of the rectifier.
Keywords :
PWM power convertors; PWM rectifiers; closed loop systems; electric current control; harmonic generation; harmonics suppression; power grids; power supply quality; reliability; voltage control; 2nd voltage DC-side harmonic suppression; PWM converter control strategy; PWM rectifier; low-order harmonic generation; negative-sequence current control; positive-sequence current control; rectifier AC-side current asymmetry degree; rectifier output voltage quality; reliability; symmetrical double closed-loop system; unbalanced grid supply; Equations; Harmonic analysis; Power system harmonics; Pulse width modulation; Reactive power; Rectifiers; Voltage control;
Conference_Titel :
Power and Energy Engineering Conference (APPEEC), 2012 Asia-Pacific
Conference_Location :
Shanghai
Print_ISBN :
978-1-4577-0545-8
DOI :
10.1109/APPEEC.2012.6307720
