Hi, I am new at using Matpower and I have two questions:

1. I tried to launch an OPF but I wanted it to only vary the reactive power of 
the generators to get to a solution, thus I put Pmax, Pmin and Pg to the same 
values. Apparently I cannot do that because I get the following error message: 

> In mips at 422
  In mipsopf_solver at 145
  In opf_execute at 106
  In opf at 225
  In runopf at 96
  In MAIN at 190
Warning: Matrix is close to singular or badly scaled.
         Results may be inaccurate. RCOND = 2.164066e-019. 


Do you know how to help me?


2. I put a generator to 0 production and then I launch my OPF, the results gave 
me for that generator a production of 7,00441667255350e-06
My question is, how can I ask my OPF not to start a generator for a production 
that low? Let's say that I want my OPF to start a generator for at least a 
production of 5MW?

Thank you for your help,

Regards,

G.D.                                      

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