Bus 1 represents the grid connection which has negative active power because the active power from PV is larger that the load active power.
Στις 24 Νοε 2016 07:38, ο χρήστης "Saranya A" <[email protected]> έγραψε: > I ran the "casePV3" and observed that bus 1 which is slack bus has Pg as > -3MW. Can a bus which has photovoltaic unit as generator observe real > power? I am not pretty aware of the power electronics of it. I think if you > can reason that out you may get some direction. > > Regards, > Saranya A > > On Thu, Nov 24, 2016 at 4:08 AM, Alexandros Gesios < > [email protected]> wrote: > >> Ι made some changes in the matrices and OPF completes but I do not think >> that it allocates the reactive power among the PVs in an optimal way >> regarding the losses. >> The last three PVs absorb Qm reactive power while the other operate in a >> unity power factor. >> I attach the case in order to be more specific. Also the network is >> radial. >> >> >> 2016-11-23 20:46 GMT+02:00 Alexandros Gesios <[email protected]> >> : >> >>> Dr. Zimmerman >>> >>> >>> I applied the change you have mentioned and the result is the following: >>> >>> >>> MATPOWER Version 6.0b1, 01-Jun-2016 -- AC Optimal Power Flow >>> MATLAB Interior Point Solver -- MIPS, Version 1.2.1, 01-Jun-2016 >>> (using built-in linear solver) >>> Numerically Failed >>> >>> Did not converge in 9 iterations. >>> >>> >>>>> Did NOT converge (0.11 seconds) <<<<< >>> >>> >>> >>> >>> 2016-11-23 19:54 GMT+02:00 Ray Zimmerman <[email protected]>: >>> >>>> I think you want to change the first column of your gencost entries to >>>> 2 (polynomial) instead of 1 (piecewise linear). Hopefully, that fixes your >>>> problem and it will solve. >>>> >>>> Ray >>>> >>>> > On Nov 23, 2016, at 10:30 AM, Alexandros Gesios < >>>> [email protected]> wrote: >>>> > >>>> > Hello to everyone >>>> > >>>> > I am new to MATPOWER and I am trying to operate an OPF analysis in a >>>> MV grid constisted of two feeders. >>>> > The first feeder has 10 inductive loads and the second feeder has 10 >>>> photovoltaic units and their are connected to the grid by the slack bus. >>>> > What I want to achieve is loss minimization by allocating the >>>> reactive power among the photovoltaic units in a optimal way. The nominal >>>> active power of the PV units is 10.6 MW and the load is 6 MW so the extra >>>> active power is being absorbed by the HV/MV Grid. >>>> > Also I want the slack bus to operate at constant 1.05 pu voltage so >>>> in the mpc.bus slack bus has voltage limits Vmax=Vmin=1.05. >>>> > Also I want the PV units to operate in nominal power so in mpc.gen >>>> their active power limits are Pmax=Pmin=Pnom. >>>> > >>>> > Finally the mpc.gencost matrix constists of 11 rows and every row has >>>> these elements 1 0 0 2 2 4; because I read in >>>> the archive that in order to achieve loss minimization you need the same >>>> linear costs in the gencost matrix. >>>> > >>>> > When I run runopf(mycase) I take the following errors >>>> > >>>> > Index exceeds matrix dimensions. >>>> > >>>> > Error in opf_setup (line 84) >>>> > x1 = mpc.gencost(pwl1, COST+2); >>>> > >>>> > Error in opf (line 198) >>>> > om = opf_setup(mpc, mpopt); >>>> > >>>> > Error in runopf (line 75) >>>> > [r, success] = opf(casedata, mpopt); >>>> > >>>> > Also, I would like to ask whether my problem can be formulated in >>>> MATPOWER. >>>> > >>>> > >>>> > Thank you in advance >>>> > >>>> > >>>> > Alexandros Gesios >>>> >>>> >>>> >>>> >>> >> >
