Electricity: power supply or regulation systems – For phase shift or control
Patent
1979-11-30
1981-09-29
Shoop, William M.
Electricity: power supply or regulation systems
For phase shift or control
318702, 307102, G05F 500
Patent
active
042925800
ABSTRACT:
A circuit arrangement, for deriving, from sensed power variations in a network, a signal for supplying the exciter of at least one synchronous machine coupled to the network, includes first and second vector identifiers, each providing a direct and phase-shifted output with each of the outputs coupled through an impedance matching amplifier to a summing junction. The direct signal from the first vector identifier and phase-shifted signal from the second vector identifier are conducted to one summing junction and the phase-shifted output of the first vector identifier and direct output of the second vector identifier to a second summing junction, with the outputs of the two summing junctions summed at a further summing junction after being coupled through additional impedance matching amplifiers to result in a total signal at the output of the third summing junction which varies in a mathematically positive sense with increasing oscillation frequency.
REFERENCES:
patent: 3482190 (1969-12-01), Brenin
patent: 3916353 (1975-10-01), Halberstein
patent: 3968422 (1976-07-01), Waldmann
patent: 4041370 (1977-08-01), Schroder
Kaufhold Wolfgang
Ott Gunther
Shoop William M.
Siemens Aktiengesellschaft
Wong Peter S.
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