One of the key goal of renewable and distributed energy systems is to achieve grid parity. In 2014, nineteen markets have reached grid parity using distributed energy sources like solar and wind power. Such energy systems use grid connected storage systems. Because of achieving grid parity these systems have caught widespread attention worldwide which has been reflected in the policy papers of different countries. 2015 International Future Energy Challenge (IFEC) Student Competition offers students all around the world to integrate their knowledge on the above mentioned areas in Topic (B): Battery Energy Storage with an Inverter that Mimics Synchronous Generators. The topic requires designing basic charging, discharging and protection circuitry for the battery as well as seamless power management, both in standalone and grid connected mode while reducing cost.
The BUET IFEC Team has built a grid connected inverter system employing full bridge DC-DC converter to convert low voltage from battery to grid level voltage, H-bridge SPWM inverter to convert DC voltage to AC voltage and PWM controlled synchronous buck charge controller. In order to drive this power circuits we designed SPWM, PWM and necessary filtering schemes. The technical report can be read here. We have awarded Best Educational Impact award in the final round at University of Sheffield, UK.
Our project has been featured in the leadning national newspapers Prothom Alo and Kaler Kantho.