High-integration-degree motor driving and charger-and-discharger integrated topology

Abstract

The invention discloses a high-integration-degree motor driving and charger-and-discharger integrated topology, wherein the topology belongs to the field of power transmission technology. According tohigh-integration-degree motor driving and charger-and-discharger integrated topology, a front-stage bidirectional DC / DC converter and a back-stage four-leg bidirectional converter are used as the motor driving and charger-and-discharger integration topology; a four-leg bidirectional converter is used as a motor driving inverter and a charging-and-discharging converter which do not operate simultaneously; in realizing bidirectional energy flow of a storage battery and a power grid, a motor stator winding is used as a filtering inductor in power integration. According to the method, multiple functions which comprise a rectification function and a power integration inverting function in motor driving and charger-and-discharger technology can be realized through the integrated topology; the motor winding is used as the filtering inductor, thereby eliminating an additional filtering inductor, greatly saving use of a switch device and an energy storage element, improving system power density and effectively suppressing a power entering current harmonic wave; and furthermore a single-phase charging-and-discharging structure with three parallelly connected phases has certain error tolerance performance.

Description

technical field [0001] The invention relates to the technical field of electric power transmission, in particular to a highly integrated integrated topology of a motor drive and a charging and discharging device. Background technique [0002] At present, energy consumption is increasing, environmental pollution is particularly serious, and the exhaust pollution and energy consumption problems of the automobile industry also need to be solved urgently. It is necessary to improve technology and increase utilization rate. As an effective solution that can effectively improve energy utilization and reduce pollutant emissions, electric vehicles have gained widespread attention. [0003] However, the weight and volume of the currently studied vehicle-mounted charging system affect the overall efficiency, performance, and cost of electric vehicles. There are common problems such as high cost, large volume, heavy weight, low power level, and non-negligible harmonic pollution to the ...

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Problems solved by technology

[0006] Purpose of the invention: The technical problem to be solved by the present invention is to provide a highly integrated motor drive and charge-discharger integrated topology for the defects of high cost, large volume and mass, low integration and low power density of the integrated controller. The driver is integrated with the charging and discharging driver, which can improve the power density of the system and increase the fault tolerance performance of the charging and discharging technology. The larger motor winding inductance can suppress the harmonics of the incoming current, and the same current in the three-phase stator winding eliminates The electromagnetic torque that is not conducive to the charging and discharging operation of the system can not only realize the two-way flow of power grid and battery energy through charging and discharging technology, but also smooth the peak and remove the trough, increasing the stability of the power grid

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