Integrated control strategy for a power converter used for photovoltaic lighting applications and its transition analysis

Utilization of solar energy for residential lighting applications in the off-grid areas plays a beneficial role in the present life. It is necessary to have a suitable dc-dc converter to make best utilization of solar power. This paper proposes a new topology for power converter with suitable control strategy implemented to drive LED lighting from a PV module. The working of power converter can be analysed under four different states of operation which can be categorized based on the availability of solar insolation, State of charging (SOC) of a battery and load requirements. Suitable integrated controller which is a combination of several control actions such as MPPT control, battery charge control, outer voltage and inner current loop control has been implemented. The analysis during the transition between different states of operation has been done based on the simulation results obtained from the Matlab/Simulink model.

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