Ultr-Capacitor based Bi-Directional Buck-Boost Converter for Power Flow Control in Hybrid Electrical Vehicles

Abstract

Use of various power-buffers in the electrical vehicles have a signicant impact on its performance The use of Ultra-Capacitor gives the improvement in power handling capacity of the Electric Vehicles. The system for managing energy ow of hybrid electric vehicles is studied. This system consists of batteries and Ultra-Capacitors. The ultra-capacitor concerns with the rapid rate of energy recovery in the acceleration operation of electric vehicles. By Proper design of converter and with a use of power buer battery performance can be improved and it's life can be increased. The project utilizes the application of a ultra-capacitor for better energy management in the electric vehicle. This type of system reduces the stress on the main batteries and keeps the stress away from it and increases the efficiency. Such system extracts the power from the batteries at slow rates. The weight of such system is less as compared to non-hybrid systems, hence efficiency is also increased. The active clamped DC-DC converter is used to get controlled and instantaneous power ow. With the help of ATMEGA16 controller, open-loop and closed loop operations of the bidirec- tional converter are achieved. Pulses are created by using PWM technique. For a high-dynamic energy storage system design and its control, an electrical equivalent circuit modeling of ultra-capacitor using passive elements is performed. This hybrid converter is analyzed. A close resemblance of experimental results with simulated results is achieved by the prototype system of 200 W.