Title :
Parallel Structure Fractional Repetitive Control for PWM Inverters
Author :
Tianqi Liu ; Danwei Wang
Author_Institution :
Centre for E-City, Nanyang Technol. Univ., Singapore, Singapore
Abstract :
In this paper, a parallel structure fractional repetitive control (RC) scheme is proposed to improve the performance of pulsewidth-modulation (PWM) inverters in fractional cases where the sampling rate of the digital control system is not an integral multiple of the fundamental frequency. By introducing a correction factor, the new control scheme increases the control gains for all harmonics and locates poles accurately at targeted harmonic frequencies. As a result, the proposed control scheme achieves better tracking and rejection performance than conventional RC. Moreover, the parallel structure fractional repetitive controller requires less data memory. Dynamic response is also improved. The stability and convergence of this method are proved. Experimental results on a single-phase PWM inverter illustrate the advantages of this control scheme.
Keywords :
PWM invertors; digital control; power conversion harmonics; control gains; correction factor; digital control system; dynamic response; harmonic frequencies; parallel structure fractional repetitive control; pulsewidth-modulation inverters; rejection performance; sampling rate; single-phase PWM inverter; tracking performance; Control systems; Delays; Frequency control; Gain; Harmonic analysis; Inverters; Pulse width modulation; Convergence rate; Fractional repetitive control; PWM inverters; convergence rate; delay units; fractional repetitive control (RC); pulsewidth-modulation (PWM) inverters; transient performance;
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2015.2402117