Four quadrant operation of load commutated SCR based multilevel CSI fed open-end winding Induction motor drive

This paper presents four quadrant operation of load commutated SCR based multilevel current source inverter (CSI) fed open-end winding induction motor drive. Multilevel CSI consists of two current source inverters operated in phase shifted mode, connected to one end of the stator winding of open-end winding induction motor. Multilevel CSI is used to supply the real power requirement of the system. The other end of the stator winding is interfaced with an IGBT based voltage source inverter (VSI) for reactive power compensation alone. VSI maintains leading power factor at the CSI terminal through reactive power compensation and ensures load commutation of multilevel CSI. The proposed drive has retained its inherent regeneration capability and can be operated in all the four quadrants. This topology is experimentally verified on a 1. 5hP open-end winding induction motor with the help of a digital signal processor TMS320F28335.