Frequency converter power device series connection voltage-sharing control method

• Main Authors: LIU LE, XIAO YERAN, SHAO JUNBO, LIU SIQI, XIE PENGFEI
• Format: Patent
• Language: Chinese; English
• Published: 04.04.2023
• 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 frequency converter power device series voltage-sharing control method, which comprises the following steps of: firstly obtaining a total bus voltage value at two ends of each series power device of a frequency converter, calculating a series device equalization coefficient according to an expected voltage value at two ends of the device, performing proportional-integral regulation calculation on the voltage at two ends of the device, and calculating a series device equalization coefficient according to an output voltage result. Modulating waves of all the devices are corrected through the series device equalization coefficient, the obtained modulating waves are compared with carrier waves, PWM signals are generated, and dynamic voltage sharing of the devices is controlled. According to the method, the problem of unbalanced voltage division of the series power devices is solved, and dynamic balance of the power devices in the operation process is realized. 本发明公开了一种变频器功率器件串联均压控制方法，先获取