Application of bidirectional DC-DC converter in charging and discharging circuits for batteries of electric vehicles

Abstract

Energy storage has become a fundamental component in renewable energy systems, especially in battery-powered systems like current electric vehicles. However, in the process of charging and discharging the battery with a standard charging system, some parameters of the batteries are not controlled by the user, which leads to rapid aging and reduced life of the batteries.  We soon have to replace the new battery source. On the other hand, in an emergency or an excess of electricity, the standard charging system can hardly convert the energy in the vehicle to the grid into AC power to supply external devices. Control methods develop to protect the battery, increase its life, prolong its life, and be able to take advantage of excess currents, voltages or provide power in an emergency. The article proposes a two-way DC-DC conversion method using fuzzy logic to check the charging and discharging process of the battery to help stabilize the current, stabilize the voltage, or provide emergency power to external devices outside. The research results are simulated using Matlab/Simulink software, resulting in a very stable current, voltage, and power on the battery, meeting a stability source for the electric vehicle system and increasing the life of the batteries.