Investigation of a Multilevel Inverter for Electric Vehicle Applications BY Oskar Josefsson-THESIS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY-Division of Electric Power Engineering Department of Energy and Environment CHALMERS UNIVERSITY OF TECHNOLOGY Göteborg, Sweden 2015

 Abstract

 Electrified vehicles on the market today all use the classical two-level inverter as the propulsion inverter. This thesis analyse the potential of using a cascaded H-bridge multilevel inverter as the propulsion inverter. With a multilevel inverter, the battery is divided into several parts and the inverter can now create voltages in smaller voltage levels than the two-level inverter. This, among other benefits, reduces the EMI spectrum in the phase cables to the electric machine. It is also shown that these H-bridges can be placed into the battery casing with a marginal size increase, and some addition of the cooling circuit performance. The benefit is that the separate inverter can be omitted. In this thesis, measurements and parameterisations of the battery cells are performed at the current and frequency levels that are present in a multilevel inverter drive system. The derived model shows a great match to the measurements for different operating points and frequencies. Further, full drive cycle simulations are performed for the two analysed systems. It is shown that the inverter loss is greatly reduced with the multilevel inverter topology, mainly due to the possibility to use MOSFETs instead of IGBTs. However, the battery packs in a multilevel inverter experience a current far from DC when creating the AC-voltages to the electric machine. This leads to an increase of the battery loss but looking at the total inverterbattery losses, the system shows an efficiency improvement over the classical two-level system for all but one drive cycle. In the NEDC drive cycle the losses are reduced by 30 % but in the demanding US06 drive cycle the losses are increased by 11 % due to the high reactive power demand at high speed driving. These figures are valid for a plug-in hybrid with a 50 km electrical range where no filter capacitors are used. In a pure electric vehicle, there is always an energy benefit of using a multilevel converter since a larger battery will have lower losses. By placing capacitors over the inputs of the H-bridges, the battery current is filtered. Two different capacitor chemistries are analysed and experimentally verified and an improvement is shown, even for a small amount of capacitors and especially at cold operating conditions.

VIEW FULL TEXT:https://publications.lib.chalmers.se/records/fulltext/214013/214013.pdf

Simulating a buck converter closed loop control with PSPICE- Eng. Armando Cavero Miranda-BRAZIL

 

Analysis and design of a Forward Converter by EV2. C. Arboy et B. Cousin-PROJET DE FIN D’ETUDES GENIE ENERGETIQUE-Universidade Federal de Santa Catarina. Instituto de Eletrônica de Potência

 Analysis and design of a Forward Converter.

 Students : EV2. C. Arboy et B. Cousin, EN 2006 

Type of report : Rapport de Projet de Fin d’Etude (PFE) 

University : Federal University of Santa Catarina (UFSC) Power Electronic Engineering Department (INEP) 

Project chief : Ivo Barbi, Professor in Power Electronics Institute at the UFSC

ABSTRACT 

Our project consists in the study, the design and the realization of a Forward converter. The design of a forward converter demands great precision when calculating the different parameters and restrictions that will have to be applied when conceiving the model. The first step was the understanding of the forward converter in order to know the main parameters needed and the different mathematical equations for the choice of the different components of the forward. The use of the software PSIM completes this work for the comprehension,the collection of different values and for the checking of the circuit calculations. Once this had been done it was possible to proceed to the construction and to the test the forward converter in the laboratory. These different tests allowed us to validate the performed design and simulations. Then we have controlled the output voltage of the forward converter with a feedback control circuit in order to assure the optimal function of the forward and automatic control of the different parameters.

RESUME Ce projet a pour but l’étude et la réalisation complète d’un convertisseur Forward s’inscrivant dans un cahier des charges bien précis afin d’être tester. Un travail préliminaire portant sur l’étude qualitatives du convertisseur permet de dégager les nombreux paramètres qu’il sera nécessaire de surveiller ainsi que d’obtenir les différentes équations mathématiques utiles pour dimensionner les éléments constitutif du convertisseur. La simulation par outil informatique vient compléter cette démarche amont et nous aide ainsi à accéder à des résultats qu’il convient de confronter une fois le prototype réaliser. Ensuite le convertisseur une fois dimensionner, en ayant respecté au maximum le cahier des charges est construit puis testé. Ces différents tests nous permettent de valider notre convertisseur et les simulations effectuées. Enfin l’intégration dans une chaine de contrôle permet d’asservir le convertisseur tout en assurant un fonctionnement optimal de ce dernier et le contrôle des différents paramètres.

VIEW FULL TEXT: https://www.mediafire.com/file/l8fv816xqzvk8eq/Relatório+-+ANALYSIS+AND+DESIGN+OF+A+FORWARD+CONVERTER+(1).pdf/file

CONVERSOR PUSH-PULL ALIMENTADO EM CORRENTE-CURRENT-FED PUSH PULL CONVERTER

                                                    FIGURA 1

CONVERSOR PUSH-PULL ALIMENTADO EM CORRENTE-CURRENT-FED PUSH PULL CONVERTER

A Figura 1 mostra o conversor push pull alimentado em corrente, onde o comando das chaves ´e realizado com frequencia de chaveamento constante e razâo ciclica variavel. O conversor opera em modo de condução contınua, onde a tensâo de entrada CC em conjunto com o indutor de entrada formam uma fonte de corrente.

UNIVERSIDAD NACIONAL MAYOR DE SAN MARCOS La historia de Aldair Escobar Gutiérrez, el capitán de Selección de Taekwondo UNMSM-INGENIERIA ELECTRONICA-LIMA-PERU

REPORTAJE DE RTV DE LA UNIVERSIDAD NACIONAL MAYOR DE SAN MARCOS -FACULTAD DE INGENIERIA ELECTRONICA sobre la historia de Aldair Escobar Gutiérrez, el capitán de Selección de Taekwondo UNMSM-INGENIERIA ELECTRONICA-LIMA-PERU.