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Checks for P-Q capability curve constraints.
Returns a column vector of 1's and 0's. The 1's correspond to rows of
the gen matrix which correspond to generators which have
defined a capability curve (with sloped upper and/or lower bound on Q)
and require that additional linear constraints be added to the OPF.
The gen matrix in version 2 of the PYPOWER case format
includes columns for specifying a P-Q capability curve for a generator
defined as the intersection of two half-planes and the box constraints on
P and Q. The two half planes are defined respectively as the area below
the line connecting (Pc1, Qc1max) and (Pc2, Qc2max) and the area above
the line connecting (Pc1, Qc1min) and (Pc2, Qc2min).
If the optional 2nd argument is 'U' this function returns
True only for rows corresponding to generators that require
the upper constraint on Q. If it is 'L', only for those requiring the
lower constraint. If the 2nd argument is not specified or has any other
value it returns true for rows corresponding to gens that require either
or both of the constraints.
It is smart enough to return True only if the
corresponding linear constraint is not redundant w.r.t the box
constraints.
- Authors:
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Ray Zimmerman (PSERC Cornell),
Richard Lincoln
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