Sliding mode control of a closed-loop regulated PWM inverter under large load variations

Author

Jung, Shih-Liang ; Tzou, Ying-Yu

Author_Institution

Dept. of Control Eng., Nat. Chiao Tung Univ., Taiwan

fYear

1993

fDate

20-24 Jun 1993

Firstpage

616

Lastpage

622

Abstract

A discrete sliding mode control scheme is presented for the closed-loop regulation of a pulse-width-modulated (PWM) inverter in application of high-performance uninterruptible power supply (UPS) systems. Based on the dynamic model of the PWM inverter, the sliding condition of the concerned system can be obtained and the PWM pattern is determined at every sampling instant by the proposed sliding mode control algorithm. Time response behavior of the digitally controlled PWM inverter by using a sliding mode control scheme under large load variations has been analyzed and a systematic design procedure is also suggested. A digital signal processor (DSP)-based (TMS 320C25) PWM inverter controller with a sampling rate of 10 kHz is implemented to verify the proposed control scheme. The constructed DSP-based digitally controlled PWM inverter system has fast dynamic response and low total harmonic distortion (THD) for AC phase-controlled nonlinear load

Keywords

PWM invertors; closed loop systems; control system synthesis; digital control; digital signal processing chips; dynamic response; harmonic distortion; load (electric); power system harmonics; uninterruptible power supplies; variable structure systems; voltage control; 10 kHz; AC phase-controlled nonlinear load; DSP; PWM inverter; THD; TMS 320C25; UPS; algorithm; closed-loop regulation; design procedure; digital signal processor; digitally controlled; discrete sliding mode; dynamic model; dynamic response; harmonic distortion; load variations; sampling instant; sampling rate; time response; uninterruptible power supply; Control systems; Digital control; Power system modeling; Pulse inverters; Pulse width modulation inverters; Pulsed power supplies; Signal processing algorithms; Signal sampling; Sliding mode control; Uninterruptible power systems;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Electronics Specialists Conference, 1993. PESC '93 Record., 24th Annual IEEE

Conference_Location

Seattle, WA

Print_ISBN

0-7803-1243-0

Type

conf

DOI

10.1109/PESC.1993.471990

Filename

471990