Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1978-10-17
1980-09-09
Miller, J. D.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 37, 363 85, 363 96, H02M 700
Patent
active
042220971
ABSTRACT:
In a control apparatus for connecting three-phase current systems having respectively different frequencies to a high-voltage D.C. transmission system, the apparatus including at least two units connected to operate in parallel during normal operation and each composed of a rectifier group and an inverter group, and components permitting one of the units to operate with its energy direction reversed in unusual situations, there are further provided: an individual power regulator for each unit connected to receive a desired power signal indicating the magnitude and direction of power transmission by that unit; a common regulator connected to all of the power regulators for supplying thereto, in normal operation, the desired power signal based on the total power for all of the units; a voltage regulator for the three-phase voltage of one of the lines associated with the one unit and providing a signal representative of the magnitude of that voltage; and a device switching the control of the regulator for the one unit from the common regulator to the voltage regulator, upon occurrence of an unusual situation, to cause reversed energy direction operation to occur at an energy level proportional to the value of the signal provided by the voltage regulator.
REFERENCES:
patent: 3559036 (1971-01-01), Kanngiesser
patent: 3600662 (1971-08-01), Anwander
patent: 3694728 (1972-09-01), Kanngiesser et al.
patent: 3707669 (1972-12-01), Kanngiesser et al.
patent: 3801895 (1974-04-01), Kanngiesser et al.
patent: 3978389 (1976-08-01), Juhlin
LICENTIA Patent-Verwaltungs-G.m.b.H.
Miller J. D.
Wong Peter S.
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