Abstract
Although there is a growing interest in developing fast charging methods to enhance the Electric Vehicles' appeal, the main energy supply is still the single-phase outlet. While single-phase charging may be simpler than three-phase, there are challenges in the integration of the propulsion and charging systems without adding inductive grid filters. Such integration would bring benefits like the simplification and reduction of components, costs, volume or weight. This can be achieved by using the windings of the propulsion machine as grid filters, but the use of the electric motor as a grid inductive filter leads to the generation of pulsating torque during the charging state. This translates into vibration, noise and eventually, damage to the motor and other components of the system. In this work, the authors propose a control strategy that considerably reduces the peaks of pulsating torque generated in any rotor position while using the machine wingdings as filter. Simulation tests have been carried out to validate the control strategy, taking into account the system efficiency. Finally, experiments are conducted to prove that the reduction of the torque pulsation is achieved.
Highlights
T HE Electric Vehicle (EV) is gaining popularity due to environmental concerns and motivates research related to it
The charger topologies receives a fair amount of attention, since it is desirable to charge the EV with the higher efficiency and as fast as possible [2]
The torque cancellation strategy in single phase chargers normally assumes that the phase connected to the grid is aligned with rotor d-axis, where no torque is produced [8], [10], [19]. This provokes a lack of generality, since it is vital to have an optimized control strategy that guarantees the absence of vibrations in the system
Summary
T HE Electric Vehicle (EV) is gaining popularity due to environmental concerns and motivates research related to it. The torque cancellation strategy in single phase chargers normally assumes that the phase connected to the grid is aligned with rotor d-axis, where no torque is produced [8], [10], [19] This provokes a lack of generality, since it is vital to have an optimized control strategy that guarantees the absence of vibrations in the system. A torque cancellation strategy is presented for a single-phase charger that uses the windings of a three-phase Permanent Magnet Synchronous Motor (PMSM) as a grid filter. There is no need of having the neutral or middle points of the windings available Such a charger is able to operate reducing the vibrations, no matter the position of the rotor while charging, extending the lifetime of the motor and components attached to it. Experimental results will validate the successful operation of the control developed
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