Electricity: single generator systems – Automatic control of generator or driving means – Voltage of generator or circuit supplied
Patent
1991-09-30
1994-05-24
Hickey, R. J.
Electricity: single generator systems
Automatic control of generator or driving means
Voltage of generator or circuit supplied
322 25, H02P 900, H02P 930
Patent
active
053152298
ABSTRACT:
An automatic voltage regulator senses and controls the terminal voltage of a separately excited generator by controlling the field current applied to the field winding. In order to improve the response time of the circuit, the circuitry relies on the phasor relationships between the generator phase voltages to obviate the need for a rectification and filtering circuit, used in known AVR's. More specifically, each of the sinusoidal phase voltages is sampled and squared. The squared phase voltages are then summed together. The square root of the sum is used to provide a DC voltage signal, proportional to the terminal phase voltages V.sub.A, V.sub.B and V.sub.C. The DC voltage signal may then be compared with a reference signal to generate an error signal for use in regulating the generator terminal voltage by controlling the field current applied to the generator field winding.
REFERENCES:
patent: 3757199 (1973-09-01), Minks
patent: 4245183 (1981-01-01), Glennon
patent: 4477765 (1984-10-01), Glennon et al.
M6805 HMOS 146805 CMOS Family Microcomputer/Microprocessors User's Manual, published by Motorola, copyright 1980, pp. 48-49.
Detection and Measurement of Three-Phase Power, Reactive Power, and Power Factor, with Minimum Time Delay, By I. R. Smith and L. A. Snider, Proceedings of the IEEE, Nov. 1970, pp. 1866-1867.
Hickey R. J.
Moran M. J.
Westinghouse Electric Corp.
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