Abstract
The performance of batteries and on-board chargers (such as the volume in the car, energy storage capacity and charging speed) needs to be improved, which has become one of the main factors restricting the development of electric vehicles. The development of Vehicles to Grid technology puts forward higher requirements for chargers. With the development of Vehicles to Grid (V2G) technology, more realizable functions put forward higher requirements for chargers. To solve the problem of charging system in electric vehicle, a charging-driving integrated topology was designed, which makes full use of two-stator motor and inverters to be transformed to a charging system. The supercapacitor and the battery are used to form the hybrid power system. In the driving mode, the startup and acceleration performance of the vehicle are improved. In the charging mode, the various functions of Vehicles to Grid technology can be satisfied, and the electrical isolation is realized. This topology not only improves the power, but also greatly reduces the charging/discharging times of the battery, and improves the overall performance of the system. The feasibility is verified by simulation.
Highlights
An on-board integral topology was developed, which can run in charging mode or
An on-board integral topology was developed, which can run in charging mode or driving mode by closing or opening several switches
The two-stator motor and two invertverters, which are used for the traction of electric vehicles (EVs), can be transformed to the charger
Summary
The core technologies of new energy vehicles are motor, battery and electronic control. The technological development of batteries has not yet met the technical requirements of electric vehicles (EVs), and the performance in terms of range capacity, power density, continuous charge and discharge is not ideal. With the further development of Vehicles to Grid (V2G) technology, it is applied to orderly charge and discharge, and applied to primary frequency regulation, spinning reserve, absorbing new energy and other aspects, so as to deepen the connection of vehicle network and realize more functions [4,5,6,7]. Different from the slow conversion of orderly charge and discharge, functions such as primary frequency modulation need to be adjusted quickly at any time according to the grid condition, so the battery will be repeatedly charged and discharged rapidly, causing great damage to the battery. Vehicles as energy storage devices under the premise of supporting the normal operation of electric vehicles
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