A microgrid system is described. The microgrid system includes a Hodrick-Prescott filter configured to generate a filtered power based on an electrical power that is generated from an renewable energy. The microgrid system further includes a battery configured to output a battery power based on the electrical power and the filtered power. Also, the microgrid system includes a state of charge (SoC) control module configured to control charging and discharging of the battery by applying a feedback control on the output battery power.