Replace Current controlled Voltage Source Converter with Rectifier Diodes in ELC?
To answer my own question:


It's easily dismissed that the VSC also functions as an inverter, thus the inductances not only buffer reactive power but also function as filter for cancelling undesired harmonics.
If no voltage balancing across all the three phases is required, one directional rectifier diodes do the job but it is risky! Generators might get destroyed by load unbalance.


The current requirements for the inductances can be chosen similar to the output filter design of high power DC -> AC inverters.