Dear Dr. Zimmerman,

We read the previous forum posts about load shedding and did as mentioned.

We multiplied load by a constant.

We also added generators Pg=0 and Qg=0 Pmax=0 Qmax=0 Pmin=-Pd, Qmin=-Pd on busses where we have loads.

The generator cost function
a) 2        0        0        3        0        -60        0;
b) 2        0        0        3        0        -1000        0;

In both cases a) and b) we got, along with numerical values,
the following warning and errors:

Warning:
MATLAB Interior Point Solver -- MIPS, Version 1.0b4, 21-May-

2010Warning: Matrix is close to singular or badly scaled.
         Results may be inaccurate. RCOND = 9.117923e-017.
In mips at 422
  In mipsopf_solver at 145   In opf_execute at 106
  In opf at 225
  In runopf at 96

OUTPUT ERROR:
Numerically Failed

Did not converge in 16 iterations.

Did not converge (4.29 seconds)

What might be the problem?
What do you advise?

Thank you for your help!



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