H - Electricity – 02 – J
Patent
H - Electricity
02
J
321/24
H02J 3/36 (2006.01) H02M 5/45 (2006.01)
Patent
CA 1210445
ABSTRACT OF THE DISCLOSURE A method, and apparatus implementing the method, for controlling the current and voltage of a high voltage, direct current transmission link connected at one end to an alternating voltage system via a rectifier and at the other end to another alternating voltage system via an inverter, wherein a first regu- lating circuit is connected to a rectifier to regulate one of the direct current and direct voltage output of the rectifier, a second regulating circuit is connected to the inverter to regulate one of the extinction angle of and current through the inverter, and a power regulator provides a signal representing a desired current magnitude to the first and second circuit means. The method includes providing a reference signal which defines a reference value for regulating the direct voltage output of the rectifier; reducing the reference value of the reference signal as long as the alternating voltage in the system connected to the rectifier has a magnitude which lies above a predetermined voltage magnitude and as long as the direct current flowing through the transmission link lies below a given current limit magnitude; and increasing the reference value of the reference signal as long as the alternating voltage in the system connected to the rectifier has a magnitude which lies below the predetermined voltage magni- tude and the direct voltage of the transmission link lies below a given maximum voltage magnitude, or as long as the direct current in the transmission link lies above the given current limit mag- nitude.
459308
Fetherstonhaugh & Co.
Licentia Patent-Verwaltungs-Gmbh
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