Power management and performance enhancement of battery and ultracapacitor fed armored fighting vehicle and electric vehicles

Abstract

This thesis investigates the ultra-capacitor-based voltage sag compensation of a DC bus that supplies power to loads, viz., an armoured fighting vehicle and an electric vehicle. Power Management and Performance Enhancement of the Battery and Ultracapacitor-fed vehicles are experimentally analysed and results are verified and the regulation of battery voltage under various working modes are studied. newlineIn Armoured Fighting Vehicles, voltage compensation has been performed on both the source side and the load side. While starting a starter motor, the battery voltage behaviour using continuously acting ultra-capacitor modules with the Equivalent Series Resistance (ESR) energy sharing principle is analysed at source side of the vehicle. A 24V, 400Ah lead acid battery bank and a 300F, 30 V ultracapacitor modules energize 11kW starter motor, which initiates the rotation of a diesel engine shaft. The dynamic models of lead-acid batteries, ultra-capacitors and starter motors are modelled and verified based on the experimental results. The complete circuit has been simulated using MATLAB/Simulink, where voltage sag is reduced while starting a starter motor from 19.1 V to 22.3 V while 75.11% of energy is shared by the ultra capacitor. The same configuration with a reduced ultra capacitor rating 63F and 30V has been implemented in hardware, and the voltage sag is limited from 18.9 V to 21.1 V with 27% of energy shared by the ultracapacitor. Both simulation and hardware fabrication of the proposed electrical system are carried out, and the results are verified. newline