Fixed frequency control method and system of Vienna rectifier, computer equipment and storage medium

• Main Authors: MU XIAOYU, WANG FEI, TONG XIANGQIAN, SONG WEIZHANG, LIU DING, DANG CHAOLIANG
• Format: Patent
• Language: Chinese; English
• Published: 15.04.2022
• 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 fixed frequency control method for a Vienna rectifier, and the method comprises the steps: obtaining a DC side voltage value of the rectifier, and calculating a power reference value of an inner ring of the rectifier through a sliding mode controller; sampling the alternating current side voltage and current of the rectifier to obtain three-phase voltage and three-phase current, and calculating the reactive power and the active power of the next moment according to the three-phase voltage and the three-phase current; meanwhile, a cost function is determined; dividing the power grid voltage into a plurality of sectors to obtain a reference voltage vector angle, determining the sector where the reference voltage vector angle is located, and traversing a switch vector; calculating three minimum cost function values and vector action time corresponding to the cost function values; a linear combination of the three basic voltage vectors can be equivalent to a power grid reference voltage