APPARATUS AND METHODS FOR CONTROL OF LOAD POWER QUALITY IN UNINTERRUPTIBLE POWER SYSTEMS
First Claim
1. A system for supplying power to a load in communication with a primary power source, the system comprising:
- a first maintenance bypass switch between the primary power source and the load;
a secondary power source in communication with the load;
a bypass static switch between the primary power source and the secondary power source;
a second maintenance bypass switch between the secondary power source and the load; and
a controller in communication with the bypass static switch, the first maintenance bypass switch, and the second maintenance bypass switch.
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Accused Products
Abstract
Systems and methods for supplying power to a load include a static switch between a primary power source and a power conditioner associated with a secondary power source, and maintenance switches between the primary and secondary power sources and a load. A controller is operable to actuate the switches. The static switch is operable to conduct power from the primary power source to a capacitor associated with the power conditioner. Current supplied from the primary power source includes portions at a fundamental frequency and a harmonic frequency. The secondary power source or the capacitor, or both, can be used to supply reactive power having a current equal and opposite that of the harmonic portion such that substantially all of the current provided to the load by the primary power source is at the fundamental frequency.
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Citations
20 Claims
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1. A system for supplying power to a load in communication with a primary power source, the system comprising:
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a first maintenance bypass switch between the primary power source and the load; a secondary power source in communication with the load; a bypass static switch between the primary power source and the secondary power source; a second maintenance bypass switch between the secondary power source and the load; and a controller in communication with the bypass static switch, the first maintenance bypass switch, and the second maintenance bypass switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17)
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15. A method for supplying power to a load in communication with a primary power source, the method comprising:
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closing a first maintenance bypass switch positioned between the primary power source and the load to provide power from the primary power source to the load; opening a second maintenance bypass switch positioned between a secondary power source and the load to disconnect a bypass static switch positioned between the primary power source and the load from the load and to further disconnect the secondary power source from the load; actuating a controller to transfer current from the primary power source to the secondary power source to charge the secondary power source to a nominal voltage; actuating the bypass static switch to disconnect the primary power source from the secondary power source; closing the second maintenance bypass switch to place the secondary power source in communication with the load; and opening the first maintenance bypass switch to disconnect the primary power source from the load. - View Dependent Claims (18)
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19. A system for supplying power to a load, the system comprising:
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a primary power source; a secondary power source; a power conditioner comprising a capacitor in communication with the secondary power source; a static switch between the primary power source and the power conditioner, wherein the static switch is operable to conduct current from the primary power source to the capacitor; a first maintenance switch between the primary power source and the load, wherein the first maintenance switch is operable to conduct current from the primary power source to the load; a second maintenance switch between the secondary power source and the load, wherein the second maintenance switch is operable to conduct current from the secondary power source to the load; and a controller operable to actuate the static switch, the first maintenance switch, and the second maintenance switch, wherein the primary power source supplies current comprising a fundamental portion having a fundamental frequency and a harmonic portion having a harmonic frequency, and wherein the capacitor, the secondary power source, or combinations thereof supply reactive power having a current equal and opposite that of the harmonic portion, thereby enabling the primary power source to provide current to the load at the fundamental frequency. - View Dependent Claims (20)
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Specification