Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1984-07-13
1987-03-10
Shaw, Clifford C.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 51, H02J 336
Patent
active
046494669
ABSTRACT:
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 regulating 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 magnitude 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 magnitude.
REFERENCES:
patent: 3906335 (1975-09-01), Watanabe et al.
patent: 4222097 (1980-09-01), Rogowsky
patent: 4250542 (1981-02-01), Bulakhov et al.
patent: 4264951 (1981-04-01), Konishi et al.
patent: 4320444 (1982-03-01), Hausler et al.
"BBC-Nachrichten" [BBC News], Oct./Nov. 1970, pp. 295-302.
IEEE Trans. PAS 89 No. 6 (1970) pp. 1120-1126, Kanngiesser, Lips, "Control Methods for Improving the Reactive Power Characteristic of HVDC Links".
IEEE Trans. PAS-91 No. 2 (1972) pp. 549-564, Rumpf, Ranade, "Comparison of Suitable Control Systems for HVDC Stations Connected to Weak AC Systems".
Licentia Patent-Verwaltungs-GmbH
Shaw Clifford C.
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