Uninterruptible power supply

Details Uninterruptible power supply Uninterruptible power supply

1990-11-20

1993-03-16

Pellinen, A. D.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Connecting or disconnecting

307 67, 307 84, 322 47, H02J 338, H02J 906

Patent

active

051947579

ABSTRACT:
Each of at least two asynchronous generators connected to a common electrical load for uninterruptibility of the power supply is driven by a corresponding one of at least two drives in such a way that when any one of the generators is driven above synchronous speed by a slip fraction while its stator is electrically excited, its shaft mechanical power is converted to electrical output power at its output terminal. A control circuit is connected to the load, coupled to the output terminals of the generators and connected to the input terminals of the generators and provides an excitation voltage and controls the phase of the excitation voltage of each of the generators with respect to the load voltage. This controls the slip fraction of each of the generators loosely whereby load current from any source is completely controlled.

REFERENCES:
patent: 3832625 (1974-08-01), Gyugyi
patent: 4382188 (1983-05-01), Cronin
patent: 4401938 (1983-08-01), Cronin
patent: 4525633 (1985-06-01), Wertheim et al.
patent: 4645940 (1987-02-01), Wertheim
patent: 5077485 (1991-12-01), Rashid

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