A control method of three-phase Z-source integrated charger with motor windings

Abstract

The driving system and the charging system of a electric vehicle cannot work simultaneously. The charging system shuts down when a electric vehicle is running and the driving system shut down when a electric vehicle is being charged. Therefore, the power converter of driving system can be used as a rectifier module to reduce the volume, weight and cost of a electric vehicle. Three-phase Z-source converter is researched in this paper, as it can not only drive motors in inverter mode but can also charge the battery in rectifier mode. In the three-phase Z-source charger, the range of output voltage is wider due to its Buck characteristic. In order to enhancing the integration level of the driving system and charging system, connection type of motor windings is modified to replace the filter inductors in the three-phase Z-source integrated charger. A charging control method is proposed and experimental platform is built to verify this method.