Control of electrically excited synchronous machine drives for ride through and controlled braking operations
First Claim
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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Accused Products
Abstract
One exemplary embodiment is method of operating an electrically excited synchronous machine (EESM) system. The system includes a converter operatively coupled with one or more stator windings, an exciter operatively coupled with one or more field windings, a controller operatively coupled with the converter and the exciter, and a power supply operatively coupled with the converter and the exciter. The controller determines whether a power supply fault condition exists and whether EESM system is operating in a motor mode or 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 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.
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Citations
24 Claims
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1. A method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system comprising:
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an electrically excited synchronous machine (EESM); a converter including an inverter operatively coupled with one or more stator windings of the EESM and a DC link operatively coupled with the inverter and a power supply; an exciter operatively coupled with one or more field windings of the EESM and operatively coupled with the power supply; and a control system operatively coupled with the converter, the control system structured to; control operation of the converter in a normal operating mode; evaluate whether a power fault condition exists, evaluate an operating mode of the EESM, selectably control operation of the converter in one of a first ride through mode and a first controlled braking mode if the power fault condition exists and the EESM is operating as a motor, and selectably control operation of the converter in one of a second ride through mode and a second controlled braking mode if the power fault condition exists and the EESM is operating as a generator. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A drive for an electrically excited synchronous machine (EESM) including one or more stator windings and one or more field windings, the drive comprising:
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a stator winding drive portion including an inverter operatively coupled with a DC link and an energy dissipation circuit; a field winding exciter portion; and a controller structured to control the stator winding drive portion according to one of; a first mode in which the stator winding drive portion and the field winding drive portion are controlled to provide power output and the controller selectably initiates one of a first ride through operation and a first controlled braking operation based upon existence of a power supply error condition, and a second mode in which the stator winding drive portion and the field winding drive portion are controlled to receive power input and the controller selectably initiates one of a second ride through operation and a second controlled braking operation based upon existence of the power supply error condition. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification