Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Patent
1996-02-22
1997-07-08
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
307 64, 310153, 318150, 318161, 290 4A, 290 4R, H02J 908
Patent
active
056464584
ABSTRACT:
An UPS (uninterruptible power system) includes an UPS power conditioning unit that provides conditioned AC power to a critical load. The UPS power conditioning unit includes a variable speed drive that operates in response to AC utility power or to a standby DC input by providing a motor drive signal. The UPS power conditioning unit further includes a motor-generator that operates in response to the motor drive output by providing the conditioned AC power to the critical load. In response to an outage in the utility AC power, standby DC power is provided by a standby DC power source that includes a variable speed drive and a flywheel motor-generator connected to the variable speed drive. Both the UPS power conditioning unit and the standby DC power source are initially operated in response to the utility AC power, the flywheel motor-generator storing kinetic energy in a rotating flywheel. When an outage occurs, the rotating flywheel continues to operate the flywheel motor-generator of the standby DC power source, causing the production of AC power which is rectified and provided as standby DC power to operate the variable speed drive of the UPS power conditioning unit until either the utility AC power outage is over or a standby emergency generator is brought on line.
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"Ride-Through Power Supplies", 6 pages, G.E. Corporation, Nov. 10, 1975.
Bowyer Richard N.
West Geoffrey
Atlas Energy Systems, Inc.
Paladini Albert W.
Shoop Jr. William M.
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