Method and apparatus for pole-slip detection in synchronous generators
AssigneeComap
InventorsMilan Kalinka, Miroslav Novak, Tomas Jelen, Roman Taragel
Life of this patent
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Abstract
A system and method for predicting a pole slip in a synchronous generator is provided. The system includes a stator voltage frequency detector to determine the frequency of the stator voltage, a mechanical frequency detector to determine the rotational speed of the rotor and a prediction unit that is operative to disconnect the generator from a power grid if it determines that that a pole slip is likely based on comparison of the frequency of the stator voltage and the rotational speed of the rotor.
Claims20
A system for predicting pole slip in a synchronous generator, the synchronous generator having a rotor rotating at a rotational speed that generates a stator voltage in a stator, the system comprising:
- a stator voltage frequency detector operative to determine a frequency of the stator voltage;
- a mechanical frequency detector operative to determine the rotational speed of the rotor;
- and
- a prediction unit operatively coupled to the stator voltage frequency detector and the mechanical frequency detector, the prediction unit further operative to send a trip signal to a circuit breaker to disconnect the generator from a power grid when the prediction unit determines that a probability of a pole slip condition meets a predetermined value.
A method for predicting pole slip in a synchronous generator, the synchronous generator having a rotor rotating at a rotational speed that generates a stator voltage in a stator, the method comprising:
- receiving a stator voltage frequency signal indicating a frequency of the stator voltage;
- receiving a rotor frequency signal indicating the rotational characteristics of the rotor;
- determining a probability of a pole slip condition based on the stator voltage frequency signal and the rotor frequency signal;
- and
- sending a trip signal to a circuit breaker to disconnect the generator from a power grid.
A synchronous generator system comprising:
- a synchronous generator having a rotor and a stator, wherein the rotor has windings and the stator has windings;
- an excitation current coupled to the rotor and operative to supply a dc current to the rotor windings;
- a stator voltage frequency detector operative to generate a stator frequency signal representative of a frequency of the stator output voltages;
- a mechanical sensor operative to generate a rotor frequency signal representative of a rotational speed of the rotor;
- and
- a pole slip prediction unit operative to predict a pole slip based on the stator frequency signal and the signal representative of the rotational speed of the rotor.
An apparatus comprising:
- a synchronous generator having a rotor and a stator, wherein the rotor has windings and the stator has windings;
- an excitation current coupled to the rotor and operative to supply a dc current to the rotor windings;
- a stator voltage period detector operative to generate a stator voltage period signal, representative of a period of the stator output voltages;
- a count sensor operative to generate a tooth count signal representative of a number of gear teeth counted over a given interval of time;
- and
- a pole slip prediction unit operative to predict a pole slip based on the stator voltage period signal and the tooth count signal.
Dependencies are inferred from the claim text.