Power converter for vehicle generator-motor and method for controlling vehicle generator-motor

摘要

Provided are a power converter for a vehicle generator-motor and a method for controlling a vehicle generator-motor, which is used for a field winding type vehicle generator-motor configured to perform control in accordance with an external operating command in which a power converter is connected to a rotating electrical machine including a field winding and an armature winding. When the generator-motor shifts from a driving state to another operating mode, a method of stopping a driving mode is switched in accordance with an operating mode to be shifted, to thereby shift the operating mode promptly without generating an unintended power generation, an excess power generation, and an excess torque fluctuation.

主权项

1. A power converter for a vehicle generator-motor, the power converter being configured to be connected to a rotating electrical machine including a field winding and an armature winding to perform control in accordance with an operation command issued from an outside,
the power converter comprising: a field power conversion section connected between the field winding and an input/output terminal for electric power, for controlling a field current flowing through the field winding; an armature power conversion section connected between the armature winding and the input/output terminal, for performing AC-DC interconversion; and a control section for controlling the field power conversion section and the armature power conversion section in accordance with an operating mode of the rotating electrical machine based on the operation command, wherein the control section switches the operating mode among a plurality of operating modes including a driving mode and at least one of a power generating mode or a braking mode,
the driving mode being configured to convert DC power supplied from the input/output terminal into AC power to generate driving torque in the rotating electrical machine,the power generating mode being configured to convert the AC power generated by the rotating electrical machine into DC power and supplying the DC power to an external load connected to the input/output terminal,the braking mode being configured to generate braking torque by consuming the AC power generated by the rotating electrical machine inside the rotating electrical machine and inside the power converter, wherein, in a case of shift from the driving mode to another mode, a timing to stop energization of an armature current of the armature winding is changed in accordance with a type of a mode to be shifted next, and wherein the control section comprises:
first driving stop portion for controlling the armature power conversion section to immediately stop the energization of the armature current when the operation of the rotating electrical machine is shifted from the driving mode to another operating mode;second driving stop portion for controlling the field power conversion section to start processing of reducing the field current and thereafter controlling the armature power conversion section to stop the energization of the armature current when the field current becomes equal to or smaller than a predetermined threshold; andswitching portion for switching between the first driving stop portion and the second driving stop portion so that the first driving stop portion is used in a case of shift from the driving mode to one of the power generating mode and the braking mode and that the second driving stop portion is used in a case of shift from the driving mode to a mode other than the power generating mode and the braking mode.