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I have used version 33.9 to capture PELEC and QELEC with the WT3 wind models before without issue. In PSSE versions >33.5 you need to ensure the wind control mode flag in the machine powerflow model is not 0 when using the WT3 dynamic models for the machine.

I typically use the "Machinearraychannel" API function to define channel:

psspy.machine_array_channel([_i, channel, bus], id, _s)

Where channel=2 for PELEC, bus is the bus number of the wind machine and id is the id of the wind machine