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Hi, I have two issues with subsystem commands in psse 1) I am trying to create a subsystem using a combination of area numbers and bus numbers as shown below ierr = psspy.bsys(sid = 1, usekv = 0, basekv = [0.0,0.0],numarea = 0, areas = [], numbus = 5, buses = [90010,90015,90016,90020,90021], numowner = 0, owners = [], numzone = 1, zones=[77])

2) I am trying create two subsystems and then append one susbystem to another. I am using "bsysadd" to do this.

ierr = psspy.bsys(sid = 1, usekv = 0, basekv = [0.0,0.0],numarea = 0, areas = [], numbus = 0, buses = [],numowner = 0, owners = [], numzone = 1, zones=[77]) ierr = psspy.bsysadd(sid = 1, usekv = 0, basekv = [0.0,0.0], numarea = 0, areas = [], numbus = 5, buses = [90010,90015,90016,90020,900215], numowner = 0, owners = [], numzone = 0, zones=[])

But nothing seems to work. Infact PSS/E does not throw any error about them.Any work arounds. Thanks in advance!!