Performance Analysis of PMSM during Regeneration fed by Dual-Inverter System

Fault mode operation of motor drives, especially in traction applications, is gaining ground. One of the common practices during fault mode is to turn off the inverter. If the inverter circuit is not electrically isolated from the machine, it acts as an uncontrolled rectifier, because of anti-parallel diodes, leading the machine to cause regenerative braking. In this paper, the performance analysis of PMSM during regeneration, which is fed by dual-inverter system, is studied in a synchronous reference frame as it gives better insight from the analysis and active compensation point of view. The harmonic analysis of all the currents and braking torque is also presented for all the operating modes during regeneration.