Design of Robust Voltage Controller for Single-phase UPS Inverter

Abstract

In this paper a robust voltage controller for a single-phase UPS inverter is newly presented. The voltage controller is designed using -based robust control scheme to simultaneously guarantee robust stability and robust tracking performance in the presence of load variations. Firstly the robust performance of the resulting controller is theoretically confirmed via -analysis. Then simulations and experiments for the single-phase inverter system with linear and nonlinear loads demonstrate feasibility of the proposed control method providing improved performance -good regulation and fast dynamic response.

Low Cost and High Performance Single Phase UPS Using a Single-Loop Robust Voltage Controller

“…The voltage controller is designed using a μ -based robust control scheme to simultaneously guarantee robust stability and robust tracking performance in the presence of load variations [24]. The authors of [24] proposed a new method using the rated outputs and power factor in order to express the uncertainty of the load. Fig.…”

“…Since the order of the designed controller is high, a reduced order Hankel techniques is used to obtain a controller in the fourth order. The transfer function of the designed voltage controller is same as formula (8) [24]. Since the control system of the single-phase UPS inverter is a discrete control system, the transfer function of equation (8) is converted and used as a discrete transfer function through Tustin's bilinear transformation method.…”