Three‐phase locomotives use voltage source inverter technology for the speed control of traction motors. The voltage source inverter is fed by single phase active front end converter connected in H bridge in the locomotives. Since the voltage source inverter works in buck mode, a higher DC‐link voltage is required to provide the rated voltage of traction motors increasing the size and cost of system. This study proposes a high‐performance bi‐directional Z‐source inverter instead of voltage source inverter. Analysis is performed in all regions of operation of locomotive drive‐acceleration, free running and regenerative braking. Both the speed control techniques‐variable voltage variable frequency and field weakening are used for the drives. Simulation study of the system shows that the DC‐link voltage gets reduced by 39% which in turn lower the voltage stress. This will decrease the traction transformer output voltage. Reduction in the harmonics at the output of Z‐source inverter by 16% reduces the overheating of traction motor drive. A small scale prototype of Z‐source inverter fed drive is made in the laboratory to verify the performance obtained from the simulation.
High‐performance bi‐directional Z‐source inverter for locomotive drive application
IET Electrical Systems in Transportation ; 5 , 4 ; 166-174
2015-12-01
9 pages
Article (Journal)
Electronic Resource
English
DC‐link voltage , electric locomotives , field weakening , invertors , traction motor speed control , traction motor drives , traction motor drive overheating reduction , high‐performance bidirectional Z‐source inverter , traction transformer , angular velocity control , bridge circuits , single phase active front end converter , H‐bridge , harmonics suppression , three‐phase locomotive drive application , regenerative braking , power transformers , harmonic reduction
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