Why do the Dual Central Inverter one is star connected and the other one is delta connected to the 12-pulse transformers?

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Ranjan Kumar

To make 30 degree phase difference

Fadhil Abbas

There are two reasons for this connection:

First is to eliminate the injected third harmonic to the grid due to the delta connection.

The second; is the phase shift 30o between the primary and secondary voltages is necessary to obtain the 12 pulse output voltage.