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Hi, I have a question about power flow mismatch calculation in psspy when I use this code psspy.fdns and the IERR = 4 "buses in island(s) without a swing bus; use activity TREE". I am using the following code for power flow mismatch calculation. It is wondering that when the IERR = 4, I also get some value for mva however I don't know what this value is and how it is calculated! I appreciate your sharing your experience with this issue.

psspy.fdns([0,0,0,1,1,0,99,0]) mva = psspy.sysmsm()