Dear all,

    How can I configure a indispatchable generator (I hope the P and Q
are constant)?  I think it can be configured as a negative load. Is
there any other better solutions?

    And the opf in matpower is just fit for the problem of cost. But
there are many other optimal power flow, such as minimum of loss,
minimum of transmission load rate. Maybe it is not a solution of cost,
can I configure or write the object function such as that in matpower,
and what will I do if i want to change the object function of opf?

    finally, is there any simple demo to add constrain equation such
as Pi+Pj==0. I have red the manual, but I donnot know how to add a
user constrain.

    Best regards,

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