thank you so much sir! On Fri, Oct 17, 2014 at 2:52 AM, Ray Zimmerman <[email protected]> wrote: > If you used the A, l and u fields of the MATPOWER case struct (mpc) to > specify the constraints, then the multipliers are in … > > results.lin.mu.l.usr > results.lin.mu.u.usr > > Note that these will be relative to power in p.u. not in MW, so you’ll have > to divide by baseMVA to get prices in $/MW. > > -- > Ray Zimmerman > Senior Research Associate > B30 Warren Hall, Cornell University, Ithaca, NY 14853 USA > phone: (607) 255-9645 > > > On Oct 16, 2014, at 12:52 PM, vids <[email protected]> wrote: > > Hi Dr Zimmerman, > How do i access the multipliers for the additional constraint that I > added? thank you > > On Tue, Sep 2, 2014 at 10:26 PM, Ray Zimmerman <[email protected]> wrote: > > Can you accomplish what you want simply by including the base dispatch in > the PD column of the bus matrix (where injections would appears as negative > loads)? > > -- > Ray Zimmerman > Senior Research Associate > B30 Warren Hall, Cornell University, Ithaca, NY 14853 USA > phone: (607) 255-9645 > > On Aug 28, 2014, at 10:10 PM, vids <[email protected]> wrote: > > Thank you very much, Dr. Shri. Yes i think your suggestion about > making the delta Pg as the control variables is a great idea. However > I am new to Matpower. Can you help me/ direct me to some examples on > how i can accomplish this? Thank you very much... > > On Thu, Aug 28, 2014 at 12:23 AM, Abhyankar, Shrirang G. > <[email protected]> wrote: > > Vids, > Implementing your reformulated OPF equations, written in complementarity > form, is non-trivial in MATPOWER as it will require modifying the > variable/equation sizes and muddling with the OPF data structures. Note > that you'll also need additional equations, perhaps expressed in > semi-smooth form, relating your upward/downward balancing service to > generator power deviation. You will have to spend some time to understand > the OPF data structures and how they are used in the various OPF routines. > > One other possible way (that I think will work) is by using the real power > generator deviation \Delta{Pg} as the control variable instead of Pg (see > the attached equations). This will keep the sizes of the > variables/equations for the reformulated OPF same as the original one. > However, you will have to modify the cost function, gradient, Hessian, and > the generator real power limits accordingly. > > Shri > > -----Original Message----- > From: vids <[email protected]> > Reply-To: MATPOWER discussion forum <[email protected]> > Date: Wed, 27 Aug 2014 16:18:14 +0800 > To: <[email protected]> > Subject: Modifying the Power Balance Equations > > Hi Dr Zimmerman and Matpower Community, > > I am trying implement an OPF where the real power dispatch is > pre-determined (as in the case of an energy market where the Q > schedules are managed separately by the transmission operator). > > Is it possible to implement it in Matpower? My idea is to add "slack" > variables in the nodal energy equations > > Pgi - ΔPgi + Pb1i - Pb2i - Pdi = ΣViVjYij(cos(θij + δi -δj) > > Pgi - fixed/predetermined real power generated at node i > ΔPgi - real power 're-scheduling' due to the reactive power dispatch > Pb1i - upward balancing service at node i > Pb2i - downward balancing service at node i > > Pb1i and Pb2 will have non-zero values when ΔPgi is nonzero, prompting > other generators to compensate the real power 're-scheduling' when > needed. > > This is the formulation in the dissertation of Dr. El-Samahy, and I > am wondering if this can be implemented in matpower. > > Any ideas would greatly be appreciated. Thank you very much. > > -- > 2 Cor 12:9 > Each time he said, "My grace is all you need. My power works best in > weakness." So now I am glad to boast about my weakness, so that the > power of Christ can work through me. > > > > > > > -- > 2 Cor 12:9 > Each time he said, "My grace is all you need. My power works best in > weakness." So now I am glad to boast about my weakness, so that the > power of Christ can work through me. > > > > > > > -- > 2 Cor 12:9 > Each time he said, "My grace is all you need. My power works best in > weakness." So now I am glad to boast about my weakness, so that the > power of Christ can work through me. > > >
-- 2 Cor 12:9 Each time he said, "My grace is all you need. My power works best in weakness." So now I am glad to boast about my weakness, so that the power of Christ can work through me.
