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US 12,308,781 B1Granted
Dynamic stabilizer for hybrid energy storage machinery with power system experiencing torsional oscillations
AssigneeRaytheon Company
InventorStephen B. Kuznetsov
Life of this patent
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Abstract
A method of stabilizing a power supply includes, receiving, at a controller connected to an alternating current (AC) excitation source, a plurality of system inputs. The method further includes obtaining a harmonic spectrum of the load current on a hybrid asynchronous induction machine, determining based on the harmonic spectrum, a first low frequency spectrum of the load current with a greatest magnitude of oscillations. Additionally, the method includes controlling the AC excitation source to generate a first compensation signal and providing the first compensation signal to the hybrid asynchronous induction machine.
Claims20
A method of stabilizing an electric power supply, the method comprising:
- receiving, at a controller connected to an alternating current (AC) excitation source, a plurality of system inputs, the plurality of system inputs comprising:
- a value of an electrical frequency (f0) on a main bus from a primary AC generator;
- a value of an electrical frequency (f1) at an output port of a stator of a hybrid asynchronous induction machine, wherein the hybrid asynchronous induction machine comprises a rotor configured to provide and receive inertial energy to and from a flywheel of an energy storage unit (ESU);
- a value of a shaft speed of the flywheel of the ESU;
- a value of an input power to the hybrid asynchronous induction machine;
- a value of an output power at the output port to one or more apparatus drawing a load current;
- and
- a value of a derivative of the output power at the output port, wherein the value of the derivative of the output power indicates a rate of change of real or reactive power;
- obtaining a harmonic spectrum of the load current;
- determining, based on the harmonic spectrum, a first low frequency spectrum of the load current with a greatest magnitude of oscillations;
- controlling the AC excitation source to generate a first compensation signal;
- and
- providing the first compensation signal to the hybrid asynchronous induction machine,
- wherein one or more waveform properties of the first compensation signal are based on at least one of:
- the value of the electrical frequency (f0) on the main bus from the primary AC generator;
- the value of the electrical frequency (f1) at the output port of the stator of the hybrid asynchronous induction machine;
- the value of the shaft speed of the flywheel of the ESU;
- the value of the input power to the hybrid asynchronous induction machine;
- and
- the value of the derivative of the output power at the output port, wherein the value of the derivative of the output power indicates the rate of change of the real or reactive power.
17 more elements
An apparatus for dynamically stabilizing an electric power supply, comprising:
- a controller configured to:
- receive a plurality of system inputs, the plurality of system inputs comprising:
- a value of an electrical frequency (f0) on a main bus from a primary alternating current (AC) generator;
- a value of an electrical frequency (f1) at an output port of a stator of a hybrid asynchronous induction machine, wherein the hybrid asynchronous induction machine comprises a rotor configured to provide and receive inertial energy to and from a flywheel of an energy storage unit (ESU);
- a value of a shaft speed of the flywheel of the ESU;
- a value of an input power to the hybrid asynchronous induction machine;
- a value of an output power at the output port to one or more apparatus drawing a load current;
- and
- a value of an output power rate-of-change at the output port;
- obtain a harmonic spectrum of the load current;
- determine, based on the harmonic spectrum, a first low frequency spectrum of the load current with a greatest magnitude of oscillations;
- control an AC excitation source to generate a first compensation signal;
- and
- provide the first compensation signal to the hybrid asynchronous induction machine,
- wherein one or more waveform properties of the first compensation signal are based on one or more of:
- the value of the electrical frequency (f0) on the main bus from the primary AC generator;
- the value of the electrical frequency (f1) at the output port of the stator of the hybrid asynchronous induction machine;
- the value of the shaft speed of the flywheel of the ESU;
- the value of the output power rate-of-change at the output port;
- and
- the value of the input power to the hybrid asynchronous induction machine.
18 more elements
Dependencies are inferred from the claim text.