Discrete Time Adaptive State Feedback Control of DC-DC Power Electronic Converters

DC-DC power electronic converters are widely used in modern electrical systems due to their broad range of applications in smart grids, electric vehicles and drive systems. A discrete time, adaptive state feedback controller for a Buck DC-DC power converter operates in the continuous conduction mode is proposed in this paper. Considering a resistive output load, discrete time dynamical model of the average mode buck converter is obtained. Then, a discrete time state feedback adaptive algorithm is developed to regulate the output voltage of an uncertain converter without exact knowledge of the converter output load, input voltage and converter parameters. The adaptive law is derived based on the normalized gradient decent algorithm to adaptively update the feedback gains. Simulation study and the corresponding experimental test cases were carried out to analyze the performance and the effectiveness of the developed controller.