Transformer fed static excitation system modelling
Hello, I am investigating a voltage spike issue associated with a transformer fed controlled rectifier type static excitation system. The excitation transformer is a three winding transformer connected at the synchronous generator terminals. The tertiary winding provides supply to the station LV switchboard and this supply has been experiencing significant voltage spikes. The voltage spikes may be due to exciter thyristor commutation and ringing (at least that is my interpretation).
We have some measurements and I need to establish the cause of the issue by transient simulation. Would it be possible for me to achieve my objective with the standard static excitation models in PSCAD or do I need to explicitly model the controlled rectifier (with snubbers etc.)? If I explicitly model the controlled rectifier, would it be possible for me to interface that with the standard synchronous machine models available?
Any direction and guidance in this regard is greatly appreciated.