Modified Circuit Design of VFD for Critical Loads under Single Phasing Condition

Modified Circuit Design of VFD for Critical Loads under Single Phasing Condition

© 2021 by IJETT Journal
Volume-69 Issue-6
Year of Publication : 2021
Authors : Amrita Sinha, Sidharth Grover
DOI :  10.14445/22315381/IJETT-V69I6P233

How to Cite?

Amrita Sinha, Sidharth Grover, "Modified Circuit Design of VFD for Critical Loads under Single Phasing Condition," International Journal of Engineering Trends and Technology, vol. 69, no. 6, pp. 233-238, 2021. Crossref,

Single phasing condition occurs in three-phase supply when one phase out of three is disrupted. Most of the machines used in the industry are three-phase induction motor Variable Frequency Drive (VFD) for controlling speed and torque. If single phasing occurs, then the system visualizes it as fault and the protection adopted disconnects the VFD from supply. This decreases efficiency of an industry by creating frequent interruption in the process. A lot of work has been reported by earlier researchers for cost saving in case of VFD and mainly kept their focus on designing protection scheme against single phasing. The scholar proposes a modified circuit to make VFD operational under single phasing by designing high value filters for critical load operation. Three phase rectifier circuit has been replaced with 3 single phase rectifiers to remove dependence of phases on each other for load sharing under single phasing. The simulation using MATLAB (2019RA) for designed circuit model produced promising results. When single phasing occurs, the critical load on VFD is automatically equally superimposed on the remaining two healthy phases without reduction in the torque and speed output.

Single phasing; Variable frequency Drive; Three-phase Induction Motor; MATLAB Simulation

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