How to see the effect of wind variation on power system

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I am trying to see the effect of wind variation on the power system but could not see any change in system response with change in any parameter of the wind machine. I have used WT3E1, WT3T1 or WT3G1 in my power system. Is there any way to see this. Someone suggested me to model the wind machine as negative load and change the value stochastically. Is this the only way to see the stochastic variation of wind in the system in PSSe and if yes then how to do that either in GUI or python. Thank you in advance for your help.

I am adding python code to change Paero variable of the WT3T1 VAR(L+4) but still there is no effect from wind plant side

psspy.read(0,r"""C:\Users\admin\xxxxxxxx\NE with wind.raw""")
psspy.dyre_new([1,1,1,1],r"""C:\Users\admin\xxxxxxx\NE with wind.dyr""","","","")
psspy.nsol([0,0,0,1,1,0,-1])
psspy.cong(0)
psspy.conl(0,1,1,[0,0],[0.0,0.0,0.0,0.0])
psspy.conl(0,1,2,[0,0],[0.0,0.0,0.0,0.0])
psspy.conl(0,1,3,[0,0],[0.0,0.0,0.0,0.0])
psspy.chsb(0,1,[-1,-1,-1,1,2,0])
psspy.chsb(0,1,[-1,-1,-1,1,7,0])
psspy.chsb(0,1,[-1,-1,-1,1,15,0])
psspy.strt_2([1,0],r"""C:\Users\admin\xxxxxxxx\wind_spd_Change1.out""")
psspy.run(1, 1.5,0,0,0)
psspy.change_wnmod_var(1,r"""1""",r"""WT3T1""",5, 150.0)  # change wind plant initial output to 150
psspy.run(1, 3.5,0,0,0)
psspy.change_wnmod_var(1,r"""1""",r"""WT3T1""",5, 300.0)  # change wind plant initial output to 300
psspy.run(1, 5.0,0,0,0)
psspy.change_wnmod_var(1,r"""1""",r"""WT3T1""",5, 200.0)  # change wind plant initial output to 200
psspy.run(1, 9.5,0,0,0)