Dear all,
I am implementing a DC OPF with DC lines (using PYPOWER python port).
In the network some buses may be connected only through DC lines, and these
I define as slack buses.
I am finding these issues:
1 - For a 2-bus system where one is dc-connected, creation of the sparse Bf
matrix fails ("cannot infer dimensions from zero sized index arrays")
2 - For a 3-bus system where one is dc-connected, the add_constraints fail
(3-buses with 2 generators each, "number of columns of A does not match
number of variables, A is 3 x 10, nv = 11"
3 - For a large system, the OPF finds a solution. However, if the
dc-isolates buses have enough generation capacity, there is no dc flow even
though it would reduce the objective function value.
Can anyone comment on these?
Thanks!
João
