Battery-Ultracapacitor fed Parallel Active Interleaved Bidirectional Converter Controlled BLDC Motor for E-Bike Application

Abstract

This paper explores the design aspects and control of the parallel active configuration of battery and ultracapacitor (UC) controlled BLDC motor drive for E-bike application. Since both the battery and UC have limitations in terms of power and energy density respectively, their combined use offers an optimized energy storage solution. The battery is interfaced to the BLDC motor through a non-isolated interleaved bidirectional converter (IBDC) and the UC is connected at the DC bus through another BDC. The interleaved architecture improves the power handling capacity and reduces the ripple current of the battery at the input port. It enables current sharing across different phases, which decreases the size of the filter inductor as well as the input and output capacitors, thus increasing the power density of the converter. The incorporation of battery-UC based PA-IBDC for the BLDC motor drive helps in efficiently storing energy regenerated from the motor during braking, thus enhancing energy utilization. Additionally, UC supports the battery during acceleration/braking phases which eradicates the negative effects of frequent battery discharging/charging. The effectiveness of the entire system is verified through simulation in MATLAB/Simulink under different operating scenarios. This research demonstrates significant potential for the future advancement of EV technology. Therefore, this work can be further extended to optimize the complete system performance with realtime validation in different practical scenarios.