Rotor synchronization of cross-compound systems on turning gear

A synchronization system for a cross-compound generator having a high-pressure rotor, a low-pressure rotor, and one or more turning gears coupled to at least one of the high-pressure and low-pressure rotors, the system comprising:

• a notch monitor controller coupled to the cross-compound generator, the notch monitor controller configured to determine a value of a time at which a calibration value of an offset is a constant value, wherein the offset is representative of a phase alignment of the high-pressure rotor relative to the low-pressure rotor, and wherein the offset is indicative of a successful electromechanical coupling between the high-pressure rotor and the low-pressure rotor;
• a high-pressure sensor coupled to the cross-compound generator for detecting a rotation of the high-pressure rotor, the high-pressure sensor coupled to a non-rotating high-pressure stator of the cross-compound generator;
• and
• a low-pressure sensor coupled to the cross-compound generator for detecting a rotation of the low-pressure rotor, the low-pressure sensor coupled to a non-rotating low-pressure stator of the cross-compound generator,
• wherein the notch monitor controller further configured to simultaneously excite the high-pressure and low-pressure rotors after the time at which the value of the offset is constant and, wherein simultaneously exciting the high-pressure and lower pressure rotors further comprises
• transmitting, via the notch monitor controller a first excitation control signal to a first excitation system controller coupled to a first winding of the high-pressure rotor,
• transmitting, via the notch monitor controller a second excitation control signal to a second excitation system controller coupled to a second winding of the low-pressure rotor, wherein transmitting the first and second excitation control signals facilitates locking in of the high-pressure rotor and the low-pressure rotor,
• disengaging the one or more turning gears from the cross-compound generator system, via a turning gear controller coupled to the cross-compound generator system and the notch monitor controller, and
• transmitting a turning gear signal representative of a presence or an absence of a state of rotational coupling of the one or more turning gears to at least one of the high-pressure rotor and the low-pressure rotor.

A power generation facility comprising:

• a cross-compound generator including
• a first generator comprising a high-pressure rotor coupled to a high-pressure turbine,
• a second generator comprising a low-pressure rotor coupled to a low-pressure turbine, and
• one or more turning gears rotatably coupled to at least one of the high-pressure and low-pressure rotors;
• and
• a synchronization system including
• a notch monitor controller coupled to the cross-compound generator, the notch monitor controller configured to determine a value of a time at which a calibration value of an offset is a constant value, wherein the offset is representative of a phase alignment of the high-pressure rotor relative to the low-pressure rotor, and wherein the offset is indicative of a successful electromechanical coupling between the high-pressure rotor and the low-pressure rotor,
• a high-pressure sensor coupled to the cross-compound generator for detecting a rotation of the high-pressure rotor, the high-pressure sensor coupled to a non-rotating high-pressure stator of the cross-compound generator, and
• a low-pressure sensor coupled to the cross-compound generator for detecting a rotation of the low-pressure rotor, the low-pressure sensor coupled to a non-rotating low-pressure stator of the cross-compound generator, the notch monitor controller further configured to simultaneously excite the high-pressure and low-pressure rotors after the time at which the value of the offset is constant, wherein simultaneously exciting the high-pressure and low-pressure rotors further comprises
• transmitting, via the notch monitor controller a first excitation control signal to a first excitation system controller coupled to a first winding of the high-pressure rotor, transmitting, via the notch monitor controller a second excitation control signal to a second excitation system controller coupled to a second winding of the low-pressure rotor, wherein transmitting the first and second excitation control signals facilitates locking in of the high-pressure rotor and the low-pressure rotor,
• disengaging the one or more turning gears from the cross-compound generator system, via a turning gear controller coupled to the cross-compound generator system and the notch monitor controller, and
• transmitting a turning gear signal representative of a presence or an absence of a state of rotational coupling of the one or more turning gears to at least one of the high-pressure rotor and the low-pressure rotor.