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The psspy.psseinit() API initializes an instance of PSSE with the number of buses shown in the parenthesis. So psspy.psseinit(150000) reserves enough memory for a 150,000 bus case. On the other hand, psspy.psseinit(200) only reserves enough memory for a 200 bus case. You can read more about the bus size limits in Section 3.3.1 of the Program Operation Manual.

I would assume psspy.psseinit(200) would run marginally faster than psspy.psseinit(150000), but that's just a hunch. You'd have to test that for yourself.

The psspy.psseinit() API initializes an instance of PSSE with the number of buses shown in the parenthesis. So psspy.psseinit(150000) reserves enough memory for a 150,000 bus case. On the other hand, psspy.psseinit(200) only reserves enough memory for a 200 bus case. You can read more about the bus size limits in Section 3.3.1 of the PSSE v33 Program Operation Manual.

I would assume psspy.psseinit(200) would run marginally faster than psspy.psseinit(150000), but that's just a hunch. You'd have to test that for yourself.