Abstract
Charging and discharging batteries A DC bus (with a constant voltage), a battery, a common load, and a bidirectional two-switch Buck-Boost DC-DC converter are used here.1- The control of battery charging as well discharging is based on using PI controllers 2- The other is for battery current regulation. The presented case study includes two modes of operation: 1-Charging mode: automatically activated when the DC bus is connected and the control objective i.e.: set point (of the PI closed loop) becomes the full voltage of the battery. 2-Discharging mode: automatically activated when the DC bus is NOT connected and the control objective (of the PI closed loop) becomes load voltage to maintain the constant load voltage during discharging. In control topology, a distinct control as well as pulse width modulation (PWM) system is created for each mode of operation using the voltage feedback control strategy. This method of charging and discharging can be used in a vehicle to grid and grid to a vehicle (here vehicle is considered as battery source/ DC source because of the same operation. Renewable energy can be used as a source to reduce pollution. The other mode of charging and discharging can be done with the help of solar as renewable resources to charge the battery. These are the way by which the closed loop buck-boost converter are been used for the battery operation.
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