Modular power unit and method suitable for four-quadrant cascade type frequency conversion

• Main Authors: GUO XIAOXING, WU ZHENHUA, REN GAOFEI, WANG HAORAN, ZHOU QIUYAN, HE TENGFEI, YU SHAOYING, SHI GUANGHUI, LIANG JINGJING, YUE YAOHUI, WANG DAN, ZHANG SHUMING, WANG ZHENGGUO, QIU YULIN
• Format: Patent
• Language: Chinese; English
• Published: 14.10.2022
• 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; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; PRINTED CIRCUITS

The invention provides a modular power unit and method suitable for four-quadrant cascade type frequency conversion. The modularized power unit is composed of a power unit module and a capacitor module. The power unit module comprises two small-size power modules, a power unit shell and a control circuit board metal cavity; the power unit main circuit adopts single-phase PWM rectification and single-phase H-bridge inversion; a four-quadrant high-voltage frequency conversion system transformer secondary winding adopting the modularized power unit is simple in structure, the design of a four-quadrant H-bridge cascade multi-level high-voltage frequency conversion system without a power unit input electric reactor is more efficiently achieved, and meanwhile rectification and inversion IGBT power modules are symmetrically arranged on two small-size power modules. The design complexity of the power unit is greatly reduced, and the modularization level of the power unit is improved; the modular power unit and the me