MMC (Modular Multilevel Converter) sub-module fault tolerance method for sharing inherent sub-module and power electronic device

• Main Authors: ZHANG JIAWEI, XIAO YUNTAO, PENG LI, WANG ZHEN
• Format: Patent
• Language: Chinese; English
• Published: 01.03.2022
• 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; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The invention discloses an MMC sub-module fault tolerance method for sharing inherent sub-modules and a power electronic device, and belongs to the field of MMC fault tolerance control, and the method comprises the steps: when the number of MMC sub-modules to be input in a first bridge arm is greater than the maximum input number of the MMC sub-modules, according to the missing value of the MMC sub-modules in the first bridge arm, determining the number of the MMC sub-modules to be input in the first bridge arm; the first optimal number of MMC compensation sub-modules needed by a first bridge arm of the A phase, the B phase and the C phase is calculated, the missing value is the difference value between the number of the MMC sub-modules to be input and the maximum input number of the MMC sub-modules, and the first bridge arm is one of an upper bridge arm and a lower bridge arm; based on the first optimal number, redundant MMC sub-modules in second bridge arms of the A phase, the B phase and the C phase are us