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Development of Digital Controller and Monitoring System for UPS Inverter  

Park, Jee-Ho (Dept. of Mechatronics Engineering, Tongmyong University)
Hwang, Gi-Hyun (Division of Computer Information Engineering, Dongseo University)
Kim, Dong-Wan (Dept. of Electrical and Electronic Engineering, Tongmyong University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.44, no.1, 2007 , pp. 1-11 More about this Journal
Abstract
In this paper, a new fully digital control method for UPS inverter, which is based on the double control loop such as the outer voltage control loop and inner current control loop, is proposed. In the proposed control system, overshoots and oscillations due to the computation time-delay are compensated by explicit incorporation of the time-delay in the current control loop transfer function. The inner current control loop is adopted by an internal model controller. The internal model controller is designed to a second order deadbeat reference-to-output response which means that its response reaches the reference in two sampling time including computational time-delays. The outer voltage control loop employing P-Resonance controller is proposed. The resonance controller has an infinite gain at resonant frequency, and the resonant frequency is set to the fundamental frequency of the reference voltage in this paper. Thus the outer voltage control loop causes no steady state error as regard to both magnitude and phase. The effectiveness of the proposed control system has been verified by the simulation and experimental results respectively.
Keywords
Internal model controller; Second order deadbeat response; P-Resonance controller; Monitering system;
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