Multi-level combined active commutation converter circuit topology and control method

• Main Authors: LI YAOHUA, LI ZIXIN, ZHAO CONG, GAO FANQIANG, XU FEI, SUN BAIYAN, ZHANG HANG
• Format: Patent
• Language: Chinese; English
• Published: 05.01.2024
• 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 provides a multi-level combined type active commutation current converter circuit topology and a control method, and belongs to the field of high-voltage direct-current transmission inverters, and the multi-level combined type active commutation current converter comprises four active commutation current converters, two three-winding industrial frequency transformers, a direct-current reactor, an LC filter and the like. In the operation process, the first active commutation current converter ACC1 and the second active commutation current converter ACC2 work in an advanced triggering fundamental frequency switching mode, the third active commutation current converter ACC3 and the fourth active commutation current converter ACC4 work in a lagging triggering fundamental frequency switching mode, the four active commutation current converters output three-level square wave currents respectively, and the four active commutation current converters output three-level square wave currents respectively.