Abstract: A method including detecting that a vehicle that may be propelled by an electric drive system having one or more motors disconnects or begins disconnecting from an off-board source of power while the one or more motors are being powered by the off-board source of power. The method may include supplanting a decreasing amount of a first electric energy supplied by the off-board source of power to the electric drive system with an amount of a second electric energy supplied by an onboard source of power to the electric drive system responsive to the detection of the disconnect from the off-board source of power.

Abstract: A system and a method for connecting a vehicle to an external source includes determining that a vehicle to be propelled by a drive system having one or more motors is to connect to an off-board power source while the one or more motors are powered by an onboard power source. The onboard power source is controlled to provide a determined amount of first electric energy to a first converter system. A second converter system is controlled to output an amount of second electric energy from the off-board power source within a designated threshold range. The second converter system is disposed between the off-board power source and the first converter system. The drive system receives power from the off-board power source responsive to the second converter system outputting the second amount of electric energy within the designated threshold range.

Abstract: A system may include an energy provision system, a first converter, a second converter, a traction system, and an auxiliary system. The energy provision system may provide a first voltage. The first converter may increase the first voltage from the energy provision system from the first voltage into at least a second voltage. The traction system of a vehicle may be powered by the second voltage from the first converter. The second converter may decrease the first voltage from the energy provision system from the first voltage to a third voltage which may be less than the second voltage. The auxiliary system of the vehicle may be powered by the third voltage from the second converter that may be less than the second voltage.

Abstract: A control system and method determine a target storage amount of electrical energy to store in an energy storage device onboard a vehicle during a charge operation in which the vehicle receives the electrical energy from an off-board power source. The control system and method determine the target storage amount based at least in part on a performance target for a planned trip of the vehicle. The control system and method control power electronics onboard the vehicle to distribute the electrical energy received during the charge operation between the energy storage device and one or more loads of the vehicle so that the energy storage device receives the target storage amount of electrical energy.

Abstract: A method including detecting that a vehicle that may be propelled by an electric drive system having one or more motors disconnects or begins disconnecting from an off-board source of power while the one or more motors are being powered by the off-board source of power. The method may include supplanting a decreasing amount of a first electric energy supplied by the off-board source of power to the electric drive system with an amount of a second electric energy supplied by an onboard source of power to the electric drive system responsive to the detection of the disconnect from the off-board source of power.

Abstract: There is provided a system for use with a fiber-optic current transducer. The system includes a processing unit configured to transduce a first light signal into a first electrical signal. The processing unit is further configured to transduce a second light signal into a second electrical signal. Furthermore, the processing unit is configured to remove offsets from the first electrical signal and the second electrical signal by forcing the first electrical signal and the second electrical signal to be on the same per unit basis.

Abstract: There is provided a system for use with a fiber-optic current transducer. The system includes a processing unit configured to transduce a first light signal into a first electrical signal. The processing unit is further configured to transduce a second light signal into a second electrical signal. The processing unit is configured to remove offsets from the first electrical signal and the second electrical signal by forcing the first electrical signal and the second electrical signal to be on the same per unit basis. Furthermore, the processing unit is configured to combine the first electrical signal and the second electrical signal to produce a composite signal, the composite signal being free of the offsets. And the processing unit is further configured to linearize the composite signal to produce an output current indicative of a current flowing in a conductor disposed proximate the FOCT.

Abstract: A system is provided. The system includes a fiber optic current sensor, and a fiber optic current transducer optically coupled to the fiber optic current sensor and configured to receive polarized light from the fiber optic current sensor, generate an electrical signal from the polarized light, and isolate a direct current (DC) component of the electrical signal. The system further includes a monitoring circuit communicatively coupled to the fiber optic current transducer and configured to receive the DC component from the fiber optic current transducer, and generate an output signal based on the DC component, wherein the output signal is indicative of an operational state of the fiber optic current sensor and the fiber optic current transducer.

Abstract: There is provided a system for use with a fiber-optic current transducer. The system includes a processing unit configured to transduce a first light signal into a first electrical signal. The processing unit is further configured to transduce a second light signal into a second electrical signal. The processing unit is configured to remove offsets from the first electrical signal and the second electrical signal by forcing the first electrical signal and the second electrical signal to be on the same per unit basis. Furthermore, the processing unit is configured to combine the first electrical signal and the second electrical signal to produce a composite signal, the composite signal being free of the offsets. And the processing unit is further configured to linearize the composite signal to produce an output current indicative of a current flowing in a conductor disposed proximate the FOCT.

Abstract: There is provided a system for use with a fiber-optic current transducer. The system includes a processing unit configured to transduce a first light signal into a first electrical signal. The processing unit is further configured to transduce a second light signal into a second electrical signal. Furthermore, the processing unit is configured to remove offsets from the first electrical signal and the second electrical signal by forcing the first electrical signal and the second electrical signal to be on the same per unit basis.

Abstract: Methods and devices for aligning an optical current transducer are provided. The aligning includes, using a novel fixture having a predetermined grooved pattern therein, mounting, in a first groove of the pattern, a first portion of a cable of the optical current transducer and a polarizer unit of the optical current transducer. Further, the aligning can include mounting, in a second groove of the pattern, a second portion of the cable and a mirror unit of the optical current transducer.

Abstract: A system includes a light source configured to generate a source of light, a fiber optic current sensor (FOCS) configured to detect the source of light, and a decoding circuitry communicatively coupled to the FOCS. The system also includes a health monitoring circuitry communicatively coupled to the decoding circuitry. The health monitoring circuitry is configured to receive a first electrical characteristic component of the first signal and a corresponding second electrical characteristic component of the second signal, to generate a summation of the first electrical characteristic component of first signal and the second electrical characteristic component of the second signal, and to generate an output signal based at least in part on the summation of the first electrical characteristic component and the second electrical characteristic component. The output signal includes an indication of an operational condition of the light source.

Abstract: A system includes a light source configured to generate a source of light, a fiber optic current sensor (FOCS) configured to detect the source of light, and a decoding circuitry communicatively coupled to the FOCS. The system also includes a health monitoring circuitry communicatively coupled to the decoding circuitry. The health monitoring circuitry is configured to receive a first electrical characteristic component of the first signal and a corresponding second electrical characteristic component of the second signal, to generate a summation of the first electrical characteristic component of first signal and the second electrical characteristic component of the second signal, and to generate an output signal based at least in part on the summation of the first electrical characteristic component and the second electrical characteristic component. The output signal includes an indication of an operational condition of the light source.

Abstract: A system is provided. The system includes a fiber optic current sensor, and a fiber optic current transducer optically coupled to the fiber optic current sensor and configured to receive polarized light from the fiber optic current sensor, generate an electrical signal from the polarized light, and isolate a direct current (DC) component of the electrical signal. The system further includes a monitoring circuit communicatively coupled to the fiber optic current transducer and configured to receive the DC component from the fiber optic current transducer, and generate an output signal based on the DC component, wherein the output signal is indicative of an operational state of the fiber optic current sensor and the fiber optic current transducer.

Abstract: Systems and methods for controlling an inertia of a synchronous condenser are described. An example system may include a motor, bidirectional power source, and at least one control device. The motor may be configured to alter a rotation of a condenser shaft to obtain a desired inertia of a synchronous condenser during a power disturbance event. The bidirectional power source may be coupled to the motor. The at least one control device may be configured to identify the power disturbance event, determine an amount of power to supply to or receive from the motor to obtain the desired inertia, and control the supply of power from the power source to the motor or from the motor to the power source based upon the determined amount of power.

Abstract: Systems and methods for controlling an inertia of a synchronous condenser are described. An example system may include a motor, bidirectional power source, and at least one control device. The motor may be configured to alter a rotation of a condenser shaft to obtain a desired inertia of a synchronous condenser during a power disturbance event. The bidirectional power source may be coupled to the motor. The at least one control device may be configured to identify the power disturbance event, determine an amount of power to supply to or receive from the motor to obtain the desired inertia, and control the supply of power from the power source to the motor or from the motor to the power source based upon the determined amount of power.