Control device and abnormality discernment method

A control device for controlling power conversion devices that are installable in a railroad vehicle and include switching elements, each of the power conversion devices being to convert electric power inputted thereto into electric power to be supplied to one or more motors and supply the electric power resulting from the conversion to the one or more motors, the control device comprising:

• first arithmetic processing circuitry and second arithmetic processing circuitry that are connected to each other via a transmission line, wherein
• the first arithmetic processing circuitry includes first calculating circuitry to determine, for each vehicle of the railroad vehicle, based on a target acceleration of the railroad vehicle and a weight of the vehicle, a basic torque command value that is a torque command value common to the motors arranged in the vehicle,
• the second arithmetic processing circuitry includes second calculating circuit to adjust, based on a parameter indicating at least one of an operating status of a device installed in the railroad vehicle or wheel diameters of wheels rotatable with torques transmitted from the motors, the basic torque command value acquired from the first calculating circuitry via the transmission line, and thereby determine, for each of the power conversion devices, a shaft torque command value that is a torque command value for the one or more motors that are to receive the electric power supplied from the power conversion device,
• the second arithmetic processing circuitry includes controlling circuitry to generate control signals that are each for achieving a torque indicated by a corresponding one of a plurality of the shaft torque command values and that are each directed to the switching elements included in a corresponding one of the power conversion devices, and output the control signals, and
• the first arithmetic processing circuitry includes abnormality determining circuitry to determine, based on the basic torque command value and the plurality of shaft torque command values, presence or absence of abnormality in at least one of the transmission line or the second calculating circuitry.