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Control of electrically excited synchronous machine drives for ride through and controlled braking operations

  • US 9,667,189 B2
  • Filed: 08/27/2015
  • Issued: 05/30/2017
  • Est. Priority Date: 08/27/2015
  • Status: Active Grant
First Claim
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1. A method comprising:

  • operating an electrically excited synchronous machine (EESM) system in a first control mode, the system including a converter operatively coupled with one or more stator windings, an exciter operatively coupled with one or more field windings, a control system operatively coupled with the converter and the exciter and including a DTC controller structured to receive a torque reference input and to provide switching commands to the converter, and a power supply operatively coupled with the converter and the exciter, the first control mode providing a first torque reference to the DTC controller;

    determining with the control system whether a power supply fault condition exists;

    determining with the control system whether the EESM system is operating in one of a motor mode and a generator mode;

    if the power supply fault condition exists and the EESM system is operating in the motor mode, entering one of a motor ride through control mode and a motor controlled braking control mode, the motor ride through control mode and the motor controlled braking control mode providing a second torque reference to the DTC controller, the second torque reference being determined differently from the first torque reference; and

    if the power supply fault condition exists and the EESM system is operating in the generator mode, entering one of a generator ride through control mode and a generator controlled braking control mode, the generator ride through control mode providing the first torque reference to the DTC controller, and the generator controlled braking control mode providing a third torque reference to the DTC controller, the third torque reference being determined differently from the first torque reference and the second torque reference.

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