Title :
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
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 VRMS, 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;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2003.816187
