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A Disturbance Observer-Based Robust Controller Against Load Variations in a Single Phase DC/AC Inverter System  

Kim, Sung-Jong (Department of Electrical Engineering, Myongji University)
Jeong, Yu-Seok (Department of Electrical Engineering, Myongji University)
Son, Young-Ik (Department of Electrical Engineering, Myongji University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.44, no.4, 2007 , pp. 21-26 More about this Journal
Abstract
Output voltage waves of a DC/AC inverter system are likely to be distorted if variable loads e.g. motors or rectifiers exist in the output terminal. This paper designs a disturbance observer-based PI-controller for a single-phase inverter system that is robust against load changes. In this Paper, we regard the output voltage changes due to various loads as disturbances of the control system. Then we design a disturbance observer for estimation of the disturbances caused by the load current and any other error sources (such as parameter uncertainties and model mismatches etc.). In order to test the performance of the proposed control law, simulation studies are carried out for a single-phase inverter system using SimPowerSystem of Matlab Simuink. Compared to a simple PI-control, the disturbance observer-based controller shows enhanced performance in transient responses for step load changes.
Keywords
SimPowerSystems;
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