Dear Ali,
The generator azimuth state is often removed from a linearized model through post-processing to convert the 4x4 system to a 3x3 system, as discussed in the following forum topic: Fast Linearized Models (starting Sep 16, 2014).
You must set VSContrl = 0 when using TrimCase = 2 because the trim solution in this case will calculate the generator torque necessary to maintain the specified rotor speed. Likewise, you must set PCMode = 0 when using TrimCase = 3 because the trim solution in this case will calculate the blade-pitch angle necessary to maintain the specified rotor speed.
Best regards,