Dynamic Modeling and Current Control of a Solar Powered Battery Storage Systems

In this paper a solar powered battery operated system is designed for domestic applications. Maximum power point tracking (MPPT) is used for efficient utilization of the solar power. The system is connected to a battery storage system for domestic applications through a buck converter. The buck converter is mathematically modelled using state space averaging method. The system transfer function is used to design a closed loop current charge controller by specifying the transient parameters required for fast and stable operation of the system. The simulations are done in MATLAB - Simulink platform. The Proportional - Integral (PI) controller designed using the transfer function model is then used for simulation of the whole system. It is observed that the battery can be efficiently operated at various reference currents, while maintaining the transient specifications defined for the system.