A modified discrete control law for UPS applications

Author

Rech, Cassiano ; Pinheiro, Humberto ; Gründling, Hilton Abílio ; Hey, Hélio Leães ; Pinheiro, José Renes

Author_Institution

Power Electron. & Control Res. Group, Fed. Univ. of Santa Maria, Brazil

Volume

18

Issue

5

fYear

2003

Firstpage

1138

Lastpage

1145

Abstract

This paper presents a model reference controller with a repetitive control action for uninterruptible power supply (UPS) applications. The model reference controller modifies the structure of the plant so that the closed-loop transfer function is equal to a chosen reference model transfer function, whereas the repetitive control action minimizes periodic distortions caused by unknown periodic disturbances. Design procedure and stability analysis of the control scheme are discussed. Simulation and experimental results for a single-phase PWM inverter (110 V_RMS, 1 kVA) controlled by a low cost microcontroller are presented to verify the performance of the proposed control approach under different load conditions.

Keywords

PWM invertors; closed loop systems; digital control; discrete time systems; electric current control; microcontrollers; stability; transfer functions; uninterruptible power supplies; voltage control; 1 kVA; 110 V; UPS applications; closed-loop transfer function; digital control; load conditions; low cost microcontroller; model reference controller; modified discrete control law; periodic distortions minimisation; reference model transfer function; repetitive control action; single-phase PWM inverter; stability analysis; uninterruptible power supply; Costs; Digital control; Frequency; Microcontrollers; Power harmonic filters; Pulse width modulation inverters; Stability analysis; Transfer functions; Uninterruptible power systems; Voltage control;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2003.816187

Filename

1224470