It appears you are using an older version of MATPOWER. Could you try it with
the latest released version and see if you still get an error.
Ray
> On Mar 1, 2015, at 3:46 PM, Bijay Hughes <[email protected]> wrote:
>
> 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
