Modulation wave superposition direct current bias modulation method for asymmetric split bus four-level inverter

• Main Authors: ZHAO RENDE, ZHAO TIANRUN, HE JINKUI, YAN QINGZENG, CHEN HAOMING
• Format: Patent
• Language: Chinese; English
• Published: 08.07.2022
• 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 a modulation wave superposition direct current bias modulation method for an asymmetric split bus four-level inverter. A direct current bus of the asymmetric split bus four-level inverter comprises four groups of voltage sources. According to the modulation wave superposition direct current bias modulation method, an A-phase modulation wave superposition direct current bias module, an A-phase upper driving signal generation module, an A-phase lower driving signal generation module and an A-phase driving signal switching module are included. And adjusting the upper positive triangular carrier, the upper negative triangular carrier, the lower positive triangular carrier and the lower negative triangular carrier according to the four groups of power supplies of the direct-current bus. And comparing the modulation wave with zero, switching between an upper driving signal and a lower driving signal through a selection switch, and finally generating a driving signal for driving a power switc