Grid-Feeding Power Converter in an AC Microgrid with a Photovoltaic Array and a Battery Pack

In this paper, a grid-feeding power converter topology is proposed so that a photovoltaic array and the mains, if necessary, can charge a battery pack. The proposal presented also considers extracting the maximum power of the photovoltaic array. The grid-feeding power converter topology is composed by a boost DC-DC converter and a bidirectional DC-AC converter connected to the mains, the control strategies for each converter are also presented. The control scheme for the boost DC-DC converter includes a maximum power point tracking algorithm. The control scheme for the bidirectional DC-AC converter has two operating modes, current-control mode and voltage-control mode. To validate the performance of the grid-feeding converter simulation results are presented. The grid-feeding converter control strategy successfully carries out the power management between the mains, the PV array and the battery.