Abstract

Robust Stability Analysis of Voltage and Current Control for Distributed Generation Systems

Mohammad N. Marwali, Min Dai, and Ali Keyhani
Ohio State Univ., Columbus, OH, USA ;

This paper appeares in : IEEE Transcations on Energy Conversion
Date: In Print

Abstract:
This paper analyzes the robust stability of a voltage and current control solution for a stand-alone distributed generation (DG) unit using structured singular value or ľ-framework based method. The voltage and current control solution consists of a discrete-time sliding mode (DSM) current controller and a perfect Robust Servomechanism Problem (RSP) voltage controller, which has been shown effective in transient response and harmonic minimization in previous study without considering parametric uncertainty. The stability robustness of the system and its transient performance are investigated under various tuning parameters of the controller. The analysis results presented in this paper demonstrate that the controller parameters can be tuned and verified to satisfy a certain transient performance requirement and at the same time guarantee robust stability under system parameter uncertainties and load variations.