Resistive torsional mode damping system and method
AssigneeGeneral Electric Company
InventorChristof Martin Sihler
Life of this patent
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Abstract
A resistive torsional mode damping system for a shaft of a machine includes: a sensor configured for sensing a signal representative of torque on the shaft; a controller configured for using the sensed signal for detecting a presence of a torsional vibration on the shaft corresponding to a natural frequency of the shaft and for generating control signals for damping the torsional vibration; and a damper including a damping converter and resistor coupled to a DC output of the damping converter, the damping converter being coupled to the machine through a power bus and having a power rating on the order of less than or equal to about five percent of a nominal power of the machine.
Claims21
A resistive torsional mode damping system for a shaft of a machine, the system comprising:
- a sensor configured for sensing a signal representative of torque on the shaft;
- a controller configured for using the sensed signal for detecting a presence of a torsional vibration on the shaft corresponding to a natural frequency of the shaft and for generating control signals for damping the torsional vibration, wherein the controller comprises a bandpass filter for passing sensor signals at a frequency corresponding to the natural mode and a phase shifter for adjusting the phase shift of each filtered signal to the correct value;
- a damper comprising a damping converter and a resistor coupled to a DC output of the damping converter, the damping converter being coupled to the machine through a power bus and having a power rating on the order of less than or equal to about five percent of a nominal power of the machine.
A resistive torsional mode damping method for a shaft of a machine, the method comprising:
- sensing a signal representative of torque on the shaft;
- bandpass filtering the signal to pass sensor signals at a frequency corresponding to the natural mode;
- adjusting the phase shift of each filtered signal to the correct value, and a gain element for controlling the magnitude of the adjusted signal
- using the adjusted signal for detecting a presence of a torsional vibration on the shaft corresponding to a natural frequency of the shaft and for generating control signals for damping the torsional vibration;
- providing the control signals to a damper comprising a damping converter and a resistor coupled to a DC output of the damping converter, wherein the damping converter is coupled to the machine through a power bus and has a power rating on the order of less than or equal to about five percent of a nominal power of the machine.
A resistive torsional mode damping system for a shaft of a wind turbine, the system comprising:
- a sensor configured for sensing a signal representative of torque on the shaft of the wind turbine;
- a controller configured for using the sensed signal for detecting a presence of a torsional vibration on the shaft corresponding to a natural frequency of the shaft and for generating control signals for damping the torsional vibration, wherein the controller comprises a bandpass filter for passing sensor signals at a frequency corresponding to the natural mode and a phase shifter for adjusting the phase shift of each filtered signal to the correct value;
- a damper comprising a diode rectifier coupled to the machine through a power bus and having a power rating on the order of less than or equal to about five percent of a nominal power of the machine, a resistor coupled to a DC output of the diode rectifier, and a pulse width modulated (PWM) element coupled in series with the resistor and configured for receiving the control signals.
Dependencies are inferred from the claim text.