DC LINKAGE SYSTEM

• Main Authors: SANO TAKAYOSHI, YAMATO IKUO
• Format: Patent
• Language: English
• Published: 08.09.2000
• Edition: 7
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; SYSTEMS FOR STORING ELECTRIC ENERGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

PROBLEM TO BE SOLVED: To ensure a margin angle of commutation of a thyristor by reducing unbalance when generated in the amplitudes of capacitor voltages. SOLUTION: In this DC linkage system, a thyristor converter 3 which is operated by an ignition angle command and converts a DC to a three-phase AC or converts a three-phase AC to a DC is connected with an AC power source 7 through capacitors 51-53 connected in series with AC terminals of the converter 3, and one three-phase AC system is linked with the other three- phase AC system by using DC. Means 91-93 detecting voltage amplitudes of the capacitors, and a means 13 correcting an ignition angle command for each of the valves V1-V6 constituting the thyrister converter, on the basis of the detected values are installed. As to correction of the ignition angle command, the mean value of a capacitor voltage amplitude of each phase is calculated, and an ignition angle correction value of the phase is determined by the difference between the mean value and the capacitor voltage amplitude of the phase.