Design and Power Flow Control in Standalone PV System with Reduced Battery Current Ripple

To improve solar photovoltaic (PV) panel efficiency, maximum power point tracking (MPPT) algorithm is needed, which could help to extract the optimal power from solar PV systems. The adaptive backstepping controlling approach is presented in this paper for tracking maximum power points in PV systems. The controller is based on the Lyapunov stability theory and connects the selection of an appropriate Lyapunov function with the design of feedback control action. The reference voltages which are generated for the controller are generated through the maximum power voltage (MPV) searching algorithm. The battery energy storage system (BESS) is linked to a bidirectional converter, which governs both the DC bus voltage and the power flow from the BESS. The operation of the DC microgrid is addressed under varying irradiance changes. Further, the impact of ripple current on the battery heating and its performance are discussed. MATLAB/Simulink software is used to simulate and validate the effectiveness of a BESS-enabled isolated solar PV-based system.