MANAGEMENT OF POWER FROM MULTIPLE SOURCES IN AN ELEVATOR POWER SYSTEM
First Claim
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1. A method for managing power in an elevator system including an elevator hoist motor, a primary power supply, and an electrical energy storage (EES) system, the method comprising:
- determining a power demand of the elevator hoist motor;
determining a state-of-charge (SOC) of the EES system; and
controlling power exchanged between the hoist motor, the primary power supply, and the EES system based on the power demand of the hoist motor and the SOC of the EES system;
wherein, when the power demand of the elevator hoist motor is negative, the controlling step comprises;
storing all energy generated by the elevator hoist motor in the EES system if the SOC of the EES system is below a minimum threshold SOC;
delivering all energy generated by the elevator hoist motor to the primary power supply if the SOC of the EES system is above a maximum threshold SOC; and
distributing the energy generated by the elevator hoist motor between the primary power supply and the EES system when the SOC of the EES system is between the minimum threshold SOC and the maximum threshold SOC, wherein the energy is distributed in a ratio that is a function of the SOC of the EES system.
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Abstract
Power is managed in an elevator system including an elevator hoist motor (12), a primary power supply (20), and an electrical energy storage (EES) system (32). A power demand of the elevator hoist motor is determined, and a state-of-charge (SOC) of the EES system is determined. Power exchanged between the hoist motor, the primary power supply, and the EES system is controlled based on the power demand of the hoist motor and the SOC of the EES system.
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Citations
20 Claims
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1. A method for managing power in an elevator system including an elevator hoist motor, a primary power supply, and an electrical energy storage (EES) system, the method comprising:
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determining a power demand of the elevator hoist motor; determining a state-of-charge (SOC) of the EES system; and controlling power exchanged between the hoist motor, the primary power supply, and the EES system based on the power demand of the hoist motor and the SOC of the EES system; wherein, when the power demand of the elevator hoist motor is negative, the controlling step comprises; storing all energy generated by the elevator hoist motor in the EES system if the SOC of the EES system is below a minimum threshold SOC; delivering all energy generated by the elevator hoist motor to the primary power supply if the SOC of the EES system is above a maximum threshold SOC; and distributing the energy generated by the elevator hoist motor between the primary power supply and the EES system when the SOC of the EES system is between the minimum threshold SOC and the maximum threshold SOC, wherein the energy is distributed in a ratio that is a function of the SOC of the EES system. - View Dependent Claims (2, 3, 5, 6, 7, 14)
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4. (canceled)
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8. A system for managing power in an elevator system including an elevator hoist motor, a primary power supply, and an electrical energy storage (EES) system connected to a regenerative drive, the system comprising:
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a first circuit adapted to determine a power demand of the elevator hoist motor; a second circuit adapted to determine a state-of-charge (SOC) of the EES system; and a control module operable to control the regenerative drive based on the power demand of the hoist motor and the SOC of the EES system to control power exchanged between the hoist motor, the primary power supply, and the EES system; wherein, when the power demand of the elevator hoist motor is negative, the control module controls the regenerative drive to (1) store all energy generated by the elevator hoist motor in the EES system if the SOC of the EES system is below a minimum threshold SOC, (2) deliver all energy generated by the elevator hoist motor to the primary power supply if the SOC of the EES system is above a maximum threshold SOC, or (3) distribute the energy generated by the elevator hoist motor between the primary power supply and the EES system when the SOC of the EES system is between the minimum threshold SOC and the maximum threshold SOC, wherein the energy is distributed in a ratio that is a function of the SOC of the EES system. - View Dependent Claims (9, 10, 12, 13)
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11. (canceled)
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15. A method for managing power in an elevator system including an elevator hoist motor, a primary power supply, and an electrical energy storage (EES) system, the method comprising:
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supplying power to the hoist motor from the primary power supply and the EES system when a hoist motor power demand is positive, wherein a ratio of power supplied from the primary power supply and the EES system is a function of a magnitude of the hoist motor power demand and a state-of-charge SOC of the EES system; and distributing energy generated by the elevator hoist motor between the primary power supply and the EES system when the hoist motor power demand is negative, wherein the energy is distributed in a ratio that is a function of the hoist motor power demand and the SOC of the EES system. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification