Abstract: A method of controlling a power generation system following a transient grid event, and a system and controller to control the power generation system are described. The method includes sensing a rate of change of electrical frequency at terminals of a generator, determining a rate of change of shaft line acceleration, and identifying the transient grid event based on the rate of change of shaft line acceleration. The method also includes triggering an action to recover from the transient grid event when the rate of change of electrical frequency exceeds a first specified value and the rate of change of shaft line acceleration exceeds a second specified value for a specified duration.

Abstract: A system includes an excitation system. The excitation system includes a memory configured to store an adaptive power system stabilizer (PSS) system configured to dynamically stabilize the operation of a generator system, and a processor communicatively coupled to the memory and configured to utilize the adaptive PSS system according to a value for one or more operational parameters of the generator system. The derived value is applied by the processor to operate the generator system when the generator system exhibits oscillations at least one of a plurality of operating frequency ranges associated with an oscillation of a power angle of the generator system. The derived value is configured to attenuate the oscillation of the power angle over the at least one of the plurality of interval operating frequency ranges.

Abstract: A method keeps a synchronous machine in a stable operating zone during large transient voltage excursions on a power grid to which the machine is connected. The machine's load angle, i.e., the position of the rotor flux with respect to the position of the stator flux, is calculated. If the load angle is not within a defined range of reference values for stable machine operation, the machine's field excitation is adjusted to bring the machine's load angle within the defined range of reference values for stable machine operation.

Abstract: A method of controlling a power generation system following a transient grid event, and a system and controller to control the power generation system are described. The method includes sensing a rate of change of electrical frequency at terminals of a generator, determining a rate of change of shaft line acceleration, and identifying the transient grid event based on the rate of change of shaft line acceleration. The method also includes triggering an action to recover from the transient grid event when the rate of change of electrical frequency exceeds a first specified value and the rate of change of shaft line acceleration exceeds a second specified value for a specified duration.

Abstract: A brushless synchronous machine with a limiter for main field voltage and a method of limiting main field voltage in a brushless synchronous machine are described. The machine includes a regulator to use a field current to excite main field windings and generate the main field voltage. The machine also includes a limiter to limit the field current to maintain the main field voltage corresponding to the field current below a limit based on a transfer function.

Abstract: A method for initializing a generator may include sending a field reference voltage to an exciter that may provide a direct current (DC) current and a DC voltage to a rotor of a generator based on a current set point that corresponds to the field reference voltage. The method may then include receiving a voltage feedback signal output by the generator, determining one or more locations of one or more poles of the generator based on the voltage feedback signal, and sending one or more firing signals to one or more switches of a starter after determining the locations of the poles, such that the switches couple the voltage to a stator of the generator.

Abstract: A method for gas turbine start-up can include placing a static starter in a torque control mode, sending a torque reference to the static starter to establish a startup torque for the gas turbine, setting current set points for the static starter and modulating a current output to achieve the startup torque.

Abstract: A method for initializing a generator may include sending a field reference voltage to an exciter that may provide a direct current (DC) current and a DC voltage to a rotor of a generator based on a current set point that corresponds to the field reference voltage. The method may then include receiving a voltage feedback signal output by the generator, determining one or more locations of one or more poles of the generator based on the voltage feedback signal, and sending one or more firing signals to one or more switches of a starter after determining the locations of the poles, such that the switches couple the voltage to a stator of the generator.

Abstract: A system includes an excitation system. The excitation system includes a memory configured to store an adaptive power system stabilizer (PSS) system configured to dynamically stabilize the operation of a generator system, and a processor communicatively coupled to the memory and configured to utilize the adaptive PSS system according to a value for one or more operational parameters of the generator system. The derived value is applied by the processor to operate the generator system when the generator system exhibits oscillations at least one of a plurality of operating frequency ranges associated with an oscillation of a power angle of the generator system. The derived value is configured to attenuate the oscillation of the power angle over the at least one of the plurality of interval operating frequency ranges.

Abstract: A system, in one embodiment, may include a static starter subsystem having detection logic for indicating a conductive state of a solid state semiconductor device. The detection logic includes a first logic gate having a first input that receives a first input signal indicating a state of the static starter subsystem, a second input that receives a second input signal indicating a state of a gate firing command being applied to the solid state semiconductor device, and a third input that receives a third input signal indicating whether the solid state semiconductor device is conducting. The first logic gate may be configured to evaluate the first, second, and third input signals and provide a first output signal indicating conductivity of the solid state semiconductor device in response to the gate firing command.

Abstract: A method for use in monitoring a synchronous machine includes coupling a power conversion assembly to an electric power source and to a synchronous machine. The synchronous machine includes a plurality of winding inter-turn portions. The method also includes energizing the synchronous machine via the power conversion assembly. The method further includes recording at least one first operational measurement of the power conversion assembly and the synchronous machine. The method also includes calculating a first impedance downstream of the power conversion assembly based on the first operational measurement. The method further includes recording at least one second operational measurement of the power conversion assembly and the synchronous machine. The method also includes calculating a second impedance downstream of the power conversion assembly based on the second operational measurement.

Abstract: A system to stabilize power supply includes a turbomachine synchronized to a grid. The system also includes a first controller configured to control field excitation of the turbomachine, and a second controller configured to block operation of the first controller based on a rate of the change in frequency of the grid.

Abstract: An apparatus for driving shaft rotation is provided and includes a shaft, which is rotatable about an axis thereof, a machine operably coupled to the shaft to be rotatable with the shaft and configured to be responsive to a load applied thereto and a driving element, which is configured to engage with the shaft at a first predefined speed and a second speed greater than the first predefined speed to drive shaft rotation.

Abstract: An apparatus for driving shaft rotation is provided and includes a shaft, which is rotatable about an axis thereof, a machine operably coupled to the shaft to be rotatable with the shaft and configured to be responsive to a load applied thereto and a driving element, which is configured to engage with the shaft at a first predefined speed and a second speed greater than the first predefined speed to drive shaft rotation.

Abstract: A system for predicting a condition includes an electric machine having slip rings and an exciter providing current and voltage to the electric machine through the slip rings. The system also includes a monitoring device that measures the current and voltage provided by the exciter to the electric machine and that forms a regression model from a current sample and compares values from a next sample to values predicted by the regression model.

Abstract: A method for use in monitoring a synchronous machine includes coupling a power conversion assembly to an electric power source and to a synchronous machine. The synchronous machine includes a plurality of winding inter-turn portions. The method also includes energizing the synchronous machine via the power conversion assembly. The method further includes recording at least one first operational measurement of the power conversion assembly and the synchronous machine. The method also includes calculating a first impedance downstream of the power conversion assembly based on the first operational measurement. The method further includes recording at least one second operational measurement of the power conversion assembly and the synchronous machine. The method also includes calculating a second impedance downstream of the power conversion assembly based on the second operational measurement.

Abstract: A system, in one embodiment, may include a static starter subsystem having detection logic for indicating a conductive state of a solid state semiconductor device. The detection logic includes a first logic gate having a first input that receives a first input signal indicating a state of the static starter subsystem, a second input that receives a second input signal indicating a state of a gate firing command being applied to the solid state semiconductor device, and a third input that receives a third input signal indicating whether the solid state semiconductor device is conducting. The first logic gate may be configured to evaluate the first, second, and third input signals and provide a first output signal indicating conductivity of the solid state semiconductor device in response to the gate firing command.

Abstract: A system for predicting a condition includes an electric machine having slip rings and an exciter providing current and voltage to the electric machine through the slip rings. The system also includes a monitoring device that measures the current and voltage provided by the exciter to the electric machine and that forms a regression model from a current sample and compares values from a next sample to values predicted by the regression model.

Abstract: A method for validating operation of a wind turbine from a remote device. The remote device communicates with a controller, which is operatively coupled to the wind turbine. The method includes enabling a user through the remote device to submit a request for wind turbine operating data, composing a command corresponding to the request, transmitting the command to the controller, and receiving by the remote device a response from the controller. The response includes wind turbine operating data corresponding to the command.

Abstract: A method for gas turbine start-up can include placing a static starter in a torque control mode, sending a torque reference to the static starter to establish a startup torque for the gas turbine, setting current set points for the static starter and modulating a current output to achieve the startup torque.