induction generator

Thestar connection should suppress any third harmonics that are balanced among phases because they are "zero sequence". i.e. if the current waveform on all three phases are identical, then the first harmonics are 120 degrees apart (positive sequence),the 2nd harmonics are 240 degrees apart (negative sequence), 3rd harmonics = 360 degrees apart (zero sequence).360 degrees apart implies being "in phase".and if you have three identical in-phase currents feeding the neutral, they must sum to zero, they must all be zero.
The capacitors are used to bring the power factor to unity or near unity. Thus, it aims at removing the harmonics. According to the above explanation, we do not have to use the capacitor bank due to it. But my opinion is that it is theoretical. We cannot have a balanced star connection.