Stability analysis of a non-inverting synchronous buck-boost power converter for a solar power management system

This paper presents the stability analysis of a non-inverting synchronous buck-boost DC/DC power converter for a solar power management system. The system can operate in buck, buck-boost or boost mode according to the condition of the supply voltage. The variation of the supply voltage arises from the rapid changes of the atmospheric condition or sunlight incident angle. The stability margins of each individual operation mode for different system parameters (inductor, capacitor) and load conditions are analyzed first. The results show that the stability margins depend on the inductor and capacitor selected for the converter and depend on the load conditions also. The systems are then modeled as Markov jump systems for evaluating the mean square stability of the systems. With careful selection of the system parameters, adequate stability margins of each individual operation mode and mean square stability of the jump system can be assured. The buck-boost converter is incorporated into the solar power battery management system to maximize the utility of the available solar power drawn from the solar panel.