Hi All,

When I remove some branches in case5, two islands are formed. First island
with slack bus (bus_type 3) and second island with no slack bus. I want to
extract the second island extract_islands(mpc,2) and run power flow. It
doesn't work obviously because there is imbalance in load and supply due to
the lack of slack bus. However, I try to change the bus type of one of the
busses in second island to 3 to have the slack bus, but my power flow still
doesn't work. It gives me the following error message:

Subscript indices must either be real positive integers or logicals.

Error in ext2int (line 185)
                as = bs(n2i(mpc.areas(:, PRICE_REF_BUS)));

Error in runpf (line 130)
mpc = ext2int(mpc);

Error in rough (line 12)
results=runpf(ccr)

Am I missing something here? Does all islands need to have slack bus
(bus_type 3) to run power flow? Why does my island still not run power flow
even though I made one of the buses into the slack bus? Could anyone please
help me out?

Thanks,

Bijay

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