An EV Drive-Train With Integrated Fast Charging Capability

This paper proposes a new class of on-board chargers for electric vehicles (EVs). Instead of being placed on-board as a separate unit, the three-phase (fast) chargers reutilize the existing components in EVs, which are already used for the propulsion. These are primarily the inverter and the machine...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2016-02, Vol.31 (2), p.1461-1471
Main Authors: Subotic, Ivan, Bodo, Nandor, Levi, Emil
Format: Article
Language:English
Subjects:
Battery chargers
Charging
Control systems
Electric power generation
Electric vehicles
Electrical equipment
Electromagnetics
five-phase machines
Hardware
Harmonics
integrated on-board chargers
Inverters
Multiphase
Phase locked loops
Phases
Power supply
Production
Propulsion
Topology
Torque
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Summary:This paper proposes a new class of on-board chargers for electric vehicles (EVs). Instead of being placed on-board as a separate unit, the three-phase (fast) chargers reutilize the existing components in EVs, which are already used for the propulsion. These are primarily the inverter and the machine, which however have to be multiphase (with more than three phases). The concept is valid for all multiphase propulsion drives with a prime number of phases higher than three and a single neutral point in motoring and is illustrated in detail for the five-phase inverter/five-phase machine configuration. During the charging mode, electromagnetic torque is not produced in the machine so that the rotor does not require mechanical locking. Hardware reconfiguration between propulsion and fast charging is required, but it is achieved with only two switches, which are the only two nonintegrated elements. The integrated topology is explained in this paper, together with the control scheme, and extension from five phases to higher phase numbers is illustrated using the seven-phase system as an example. Finally, the propulsion-mode operation with complete suppression of low-order harmonics, which map into the second plane, is achieved for the five-phase machine. Experimental verification of theoretical results and proposed control is provided for both charging and vehicle-to-grid mode of operation, as well as for propulsion.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2015.2424592