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Try to initialize PSSe to its max bus dimension:

import psspy
psspy.psseinit(50)

From Siemens PTI site: PSS®E Xplore edition is a FREE download of our world leading PSS®E software suite, offering full analytical capabilities for systems up to 50 buses.

Also, check the manual for the max. dimension for STATs, VARs, etc., Replace a model with another model with less STATs requirement.