Energy Management of a Battery Combined with PV Generation

Performance of a photovoltaic generation (PV) plant with an integrated battery energy storage system (BESS) is examined under different system conditions. The proposed scheme is executed in system studies under fluctuating levels of solar irradiation to the PV model replicating weather conditions. Three converters were implemented in this model including a boost converter, bidirectional (DC/DC) converter, and a grid-imposed inverter which were and integrated with a 7-bus AC system. All of these models were designed and simulated by using an electromagnetic transients program. As the changes in irradiation and temperature occur, the dc link voltage changes, hence there is a need to regulate the voltage. To maintain the voltage at dc link, this paper presents a bidirectional (DC/DC) converter with an energy management system (EMS). The EMS is based on a hysteresis control algorithm, which limits the abrupt charging/discharging of the battery, thus increasing battery lifespan. The irradiation was changed to observe the simulation of maximum power point tracking (MPPT) control.