H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/24
H02M 5/44 (2006.01) H02J 3/36 (2006.01) H02M 7/757 (2006.01)
Patent
CA 1122652
ABSTRACT OF THE DISCLOSURE 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.
313558
Fetherstonhaugh & Co.
Licentia Patent-Verwaltungs-Gmbh
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