Railway signalling compatability of inverter fed induction motor drives for rapid transit

Inverter fed squirrel-cage induction motor drives for rapid-transit railway traction have recently received renewed interest as an alternative to chopper fed DC drives. Various schemes are either in prototype or revenue earning service. The results of a digital computer simulation study of various voltage source inverter configurations with particular attention to signalling interference is presented in the paper. Different pulse-width modulated schemes are considered and their relative merits assessed.