UPS POWER SOURCE BASED ON PHASE-SHIFTING AUTO-TRANSFORMER AND DUAL 6-PULSE RECTIFIERS

摘要

A UPS power source based on a phase-shifting auto-transformer and dual 6-pulse rectifiers comprises a 12-pulse phase-shifting auto-transformer T1, two paths of output devices, energy storage devices, bypass static switch devices and chargers, which are connected in parallel. Each of the output devices comprises a 6-pulse rectifier, a three-phase inverter, a power-frequency isolation transformer and a main-path static switch device connected in sequence. The UPS power source adopts two paths of output devices which are connected in parallel, and the reliability is high. Meanwhile, the power-frequency isolation transformers are arranged behind the three-phase inverters of the two paths of output devices, thereby achieving the parallel connection and isolation output of two paths of symmetrical three-phase currents, and effectively reducing the rated power, the volume, the weight and the cost of a rectifier transformer at the power-frequency UPS power source rectifier side.