Designing and Modeling of Three Phase Inverter using Redundant Leg

Authors

  • R. Senthilkumar , T. Muthamizhan , Ramaprasad Maharana , P. Saravanan

Abstract

The proposed system is to replace the fault leg of a three phase inverter with another standby leg. During the instant
of any open circuit or short circuit switch fault in any leg of the inverter, the faulty leg is replaced by the redundant
leg during post-fault condition .The fault diagnosis system detect the fault occurrence, identify fault type and protects
the circuit from occurrence of over voltage due to the operation of the switches in the inverter circuit when the
switches in the inverter circuit are open circuited or short circuited. These over voltage faults in the inverter can be
rectified or minimized with the help of resistance and MOSFET combinational circuit. The output voltage of the
BLDC drive is controlled internally by the Pulse Width Modulation Technique within the inverter which would
generate torque ripples in the motor by inducing extra series value of current in the circuit. Thus effective fault
detection and separation with small modification in the circuit is achieved by bypassing the faulty switches(Sa, Sb,
Sc) with three redundant leg (Sra, Srb, Src).Validation of simulation result is achieved by comparing the results.

Published

2020-03-31

Issue

Section

Articles