Bidirectional DC-DC converter fed drive for electric vehicle system

Abstract

Batteries are the primary energy-storage devices in ground vehicles. Now days battery fed electric drives are commonly being used for electric vehicles applications, due to various advantages, such as: nearly zero emission, guaranteed load leveling, good transient operation and energy recovery during braking operation. To fulfill these requirements converters with bidirectional power flow capabilities are required to connect the accumulator (battery) to the dc link of the motor drive system. Battery fed electric vehicles (BFEVs) is required to function in three different modes namely: acceleration mode, normal (steady-state) mode and braking (regenerative) mode. During acceleration and normal modes the power flow is from battery to motor where as during braking or regenerative mode the kinetic energy of the motor is converted into electrical energy and fed back to battery. The DC-DC converter is required to perform mainly two functions: first to match the battery voltage to the motor rated voltage and second to control the power flow under steady-state and transient conditions, so that the drive performance is as per the requirement. In the present work closed loop operation of bi-directional dc-dc converter feeding a dc motor and its energy recovery due to regenerative braking has been demonstrated. The characteristics of battery operated electric vehicle under different drive condition are also presented. The effectiveness of the system is verified through the simulations using Simulink/ MATLAB 7.6.0 (R2008a) package.

Bidirectional DC/DC Power Converter for Hybrid Yacht Propulsion System

“…Bidirectional This topology ( Figure 1) has been used in many modern articles in order to connect different power sources and to get high energy, high power supply for different applications. In spite of the fact that some level of modification is possible [3], [5] the standard topology is still used most frequently [6], [7], [12]… Maybe the most appropriate example for that is commercial Toyota Prius from 2009 [4]. Figure 2 shows that DC link enables the connection of other DC/DC power converters to same microgrid (or DC buses).…”

“…Toyota Prius) [4]. DC/DC power converters have been used in different vehicles [5], [6], [7], [8], [9], [10], [11], [12] airplanes, locomotives [13] and finally ships [14] of different sizes; from radio controlled models of ships to yachts and larger ships. In each case the addition of electrical propulsion improve the maneuverability of propelled system.…”

Peramalan Kapasitas Baterai Lead Acid pada Mobil Listrik Berbasis Levenberg Marquardt Neural Network

“…Namun, pada saat yang bersamaan, algoritma ini akan mempertahankan step size agar tidak menjadi besar [9]. Persamaan matematika untuk menentukan bobot baru pada algortima levenberg marquardt ialah sebagai berikut: wnew = wold -(Z T Z) - [10].…”

Grid-Tied Single-Phase Bi-Directional PEV Charging/Discharging Control

“…The second aspect is the control strategies for bi-directional DC-DC converters. Prior research work for the application in electric vehicles includes the bi-directional power flow between batteries and motors [13,14] and energy transfer between the battery and high-voltage bus [15]. Most existing literature studies the control methods based on resistive load.…”