Integration of Photovoltaic and Battery Storage System by Using Voltage Source Controller

Solar energy has penetrated small as well as large power systems and has been growing steadily. In this paper, a small system containing PV generation, battery, and an inverter is considered. It can be operated in grid-connected or standalone modes. Moreover, this system can be controlled by a combination of a Maximum Power Point Tracking (MPPT) controller, bidirectional converter, and Voltage Source Controller (VSC). The PV output is determined by solar irradiation and ambient temperature. It is important to extract PV generation at its maximum power. Several MPPT controllers can be employed to achieve maximum power. In this paper, we have chosen to use Perturb and Observe (P&O) controller. Also, a bidirectional converter is required to regulate the DC-side power flow. VSC can interface with a three-phase network when synchronized with the network. It can also maintain Unity Power Factor (UPF) in grid-connected mode. An Inductor-Capacitor-Inductor (LCL) filter can reduce the harmonics in voltages and currents after conversion. MATLAB/Simulink toolbox R-2020a is utilized to simulate the entire system.