I haven't looked at that reference, but what I mean is that it is certainly possible that when running a power flow, which does not take into account line capacities, that any given case (such as case14) may have inputs that *do* result in line overloads. If you are running an OPF, which treats line capacities as constraints, you should not see any overloads if the OPF converges successfully.
-- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Mar 6, 2013, at 12:51 AM, ahmad rezaee <[email protected]> wrote: > Dear Dr zimmerman > > The Reference that I am referring to is the following, so, you mean that > overload in base-case is impossible. yes? > > [1] V. C. Ramesh, and X. Li, “A fuzzy multiobjective approach to contingency > constrained OPF,” Power Systems, IEEE Transactions on, vol. 12, no. 3, pp. > 1348-1354, 1997. > > Kind Regards > > Ahmad > > > From: Ray Zimmerman <[email protected]> > To: MATPOWER discussion forum <[email protected]> > Sent: Tuesday, March 5, 2013 10:35 AM > Subject: Re: overload at base case is possible?? > > The case14.m file included in MATPOWER (and converted from the IEEE CDF file > at http://www.ee.washington.edu/research/pstca/) does not include thermal > limits, so I'm not sure what violation you are referring to. On the other > hand, I don't know the original source of that data, and the specified > dispatch does seem a bit unusual, so I wouldn't assume it represents a normal > operating condition. > > -- > Ray Zimmerman > Senior Research Associate > 419A Warren Hall, Cornell University, Ithaca, NY 14853 > phone: (607) 255-9645 > > > > > On Mar 5, 2013, at 9:59 AM, ahmad rezaee <[email protected]> wrote: > >> Dear all >> >> When I do power flow in IEEE 14 bus test system for base-case, some lines >> are overloaded, indeed thermal limit is violated. (for example line 1). Its >> not so strange? >> >> thanks >> Ahmad > > >
