Can a 3 phase IGBT based front end converter work without line reactor?
You have a rectifier charging a smoothing capacitor. It can only do so when the DC line voltage is higher than the residual capacitor voltage.


The charging only ever happens when the DC line voltage peaks.


And this means you get needle-shaped currents when the line voltage peaks and no current the other times. The line reactor smoothes those current peaks.

Remove both the capacitor and the line reactor. It's a 6-pulse rectifier, you don't need a capacitor anyways.