GIPFC-based switchable fault-tolerant topology and switching method thereof

• Main Authors: XU SIXUAN, LU YAO, HU WEI, CAI HUI, DOU FEI, WU XI, WANG WEIYUAN, LIU BAILIANG, QI WANCHUN, CHENG JINMIN
• Format: Patent
• Language: Chinese; English
• Published: 25.02.2022
• 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; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses a GIPFC-based switchable fault-tolerant topology and a switching method thereof. According to the topology, four voltage source converters are adopted to be correspondingly connected in series to four loops in two double-loop lines, and the four converters can freely perform active and reactive power decoupling control on the lines where the four converters are located and do not interfere with each other; and another voltage source converter is connected in parallel to the common node of the double-loop lines, and if the capacity of the parallel-side converter still has margin, reactive compensation can be performed on a bus where the parallel-side converter is located to a certain extent, and the voltage of the bus is maintained to be constant. According to the switching method provided by the invention, when the fault occurs in the line where the series-connected voltage source converter is located or the branch where the parallel-connected voltage source converter is located, diffe