Flywheel and battery-based power supply system
First Claim
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1. A power supply system for supplying back-up power to a load, where the load is powered by power from an alternating current (AC) power source, the power supply system comprising:
- a flywheel system comprising a flywheel and an AC motor/generator electrically coupled to a direct current (DC) bus, the flywheel system configured to store, as kinetic energy, power received from the power source and, when power to the load from the power source decreases below a specified threshold, to provide the stored power to the load as electrical power through the DC bus for a first duration; and
a battery system electrically coupled concurrently with the flywheel system and without a switching circuit to the DC bus during the first duration and a second duration, the battery system to receive power from the power source through the DC bus, the battery system configured to store the power received from the power source and to provide power to the load through the DC bus for the second duration after the first duration, the sum of the first duration and the second duration is less than five minutes.
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Abstract
A power supply system includes a flywheel system electrically coupled to a DC bus for supplying electrical power between a power grid and a load. The flywheel system includes a flywheel coupled to rotate with a rotor of a motor/generator. A battery system is electrically coupled to the DC bus concurrently with the flywheel system.
13 Citations
19 Claims
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1. A power supply system for supplying back-up power to a load, where the load is powered by power from an alternating current (AC) power source, the power supply system comprising:
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a flywheel system comprising a flywheel and an AC motor/generator electrically coupled to a direct current (DC) bus, the flywheel system configured to store, as kinetic energy, power received from the power source and, when power to the load from the power source decreases below a specified threshold, to provide the stored power to the load as electrical power through the DC bus for a first duration; and a battery system electrically coupled concurrently with the flywheel system and without a switching circuit to the DC bus during the first duration and a second duration, the battery system to receive power from the power source through the DC bus, the battery system configured to store the power received from the power source and to provide power to the load through the DC bus for the second duration after the first duration, the sum of the first duration and the second duration is less than five minutes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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supplying AC power from a flywheel system, rectified, to a DC bus for a first duration while a battery system is electrically coupled without a switching circuit to the DC bus concurrently with the flywheel system, the battery system and the flywheel system to receive power from a power source, the DC bus for supplying power to the load; and supplying DC power from a battery system to the DC bus for a second duration after the first duration, where a sum of the first duration and the second duration is less than five minutes and the battery is configured to provide power for no more than five minutes. - View Dependent Claims (13, 14, 15, 16)
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17. A power supply system for providing backup power to a load powered by an AC power source, comprising:
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a flywheel system comprising a flywheel and a motor/generator electrically coupled to a DC bus to provide power to the DC bus for a first duration, the DC bus for supplying electrical power to the load, the flywheel configured to receive power from the AC power source; and a battery system electrically coupled concurrently with the flywheel system and without a switching circuit to the DC bus during the first duration and a second duration to supply power to the DC bus for the second duration, the battery system configured to receive power from the power source through the DC bus, the battery system configured to output, through the DC bus, power meeting the power requirements of the load only for a duration less than the sum of the first duration and the second duration, the sum of the first duration and the second duration is less than five minutes. - View Dependent Claims (18, 19)
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Specification