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Title: A generator-set for series hybrid electric vehicles operating at high output voltages
Author: Al-Busaidi, Ahmed Said Obaid
ISNI:       0000 0004 2722 0126
Awarding Body: University of Newcastle Upon Tyne
Current Institution: University of Newcastle upon Tyne
Date of Award: 2011
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Series hybrid electric vehicles have their wheels driven by an electric motor powered by a battery with an engine plant that cranks a generator unit to provide electric power to the battery and if necessary to the electric motor. They promise significant reductions in greenhouse gases without compromising driving performance. This year GM has launched the first mass produced series hybrid electric vehicle and other car manufacturer are to follow over the next decade. In recent years significant progress has been made in new battery techno logies, electric propulsion designs, and optimisation of power flow and control of the electric components to reduce the weight and cost. While these developments have been made successfully, little attention has been spent on improvement of the generator-set for series hybrid electric vehicles. Generally, a generator-set consists of a three-phase machine and a three-phase rectifier circuit. Conventional generator- sets suffer from significant voltage drops across the output of the rectifier circuit caused by current commutation, resulting from interaction between the machine inductances and the rectifier. Any voltage drop across the output of the rectifier circuit leads to an inefficient operation ofthe generator system. In this thesis, a new generator-set for the use in series hybrid electric vehicle applications is presented, whereby the voltage drop caused by commutation is eliminated. In a typical rectifier circuit the output voltage drop is proportional to the commutation time, which is a function of the value of the machine inductance. The novel topology operates in such a way that the commutation time becomes independent from the value of the machine inductance. This is achieved by eliminating the output de-link capacitors that are used in traditional rectifier circuits and transferring these capacitors within a new rectifier circuit. These embedded capacitors are charged and discharged simultaneously with two switches. The capacitors still have the function of electric storage but they also operate in resonance with the supply inductance.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available