Hi , I have modelled 20 photovoltaic generators in a 100 bus radial
distribution network with the parameters shown below(in the generator field).
The problem I am having is that when I model the nodes with the Photovoltaic
generators as PV buses the AC Newton Raphson loadflow does not coverge, but
when I model the same nodes as swing buses(option 3) the network converges. My
aim is to model the photovoltaic generators as var controllers, is there a way
this can be done in Matpower?
Pg=0
Qg=0
Pmin = 0
Pmax = 0
Qmax = 0.01563
Qmin = -0.01563
mBase=100
Pc1 = 0
Qc1min = 0
Qc1max = 0
Pc2 = 0.032
Qc2min = -0.01563
Qc2max = 0.01563
Richard Ngonga
> Date: Thu, 30 Aug 2012 21:36:52 -0400
> Subject: Re: Photovoltaic Generators modelling
> From: [email protected]
> To: [email protected]
>
> Assuming that you want to specify a reactive dispatch capability
> within the .9 power factor cone that we talked about earlier, and
> assuming Pmin = 0 and Pmax = 1MW, then at Pmax the reactive dispatch
> could be in [-0.4843, 0.4843] MVAr. Then, the following parameters
> define that cone for Matpower:
>
> Pmin = 0
> Pmax = 0
> Qmax = 0.4843
> Qmin = -0.4843
> Pc1 = 0
> Qc1min = 0
> Qc1max = 0
> Pc2 = 1
> Qc2min = -0.4843
> Qc2max = 0.4843
>
>
>
>
> On Thu, Aug 30, 2012 at 4:56 PM, Richard Ngonga <[email protected]> wrote:
> >
> > Hi Carlos,
> >
> > Do I have to model photovoltaic generators in matpower like diesel
> > generators? My aim is to model photovoltaic inverters as dispatchable
> > reactive power sources using Matpower's trapezidal modeling of the (P,Q)
> > feasible region. What is the best way to model them in matpower?
> >
> > Regards
> >
> > Richard
> >
> >> Date: Mon, 20 Aug 2012 12:23:10 -0400
> >> From: [email protected]
> >> To: [email protected]
> >> Subject: Re: PV Generators and Transformer modelling
> >>
> >> So, if the reactive dispatch of your generators is constrained to be
> >> within a 0.95 power factor, then you can use MATPOWER's trapezoidal
> >> modeling of the (P,Q) feasible region. as opposed to simple bound
> >> constraints on P and Q
> >> for a generator. In your case, if Pmin reaches down to 0, then you have
> >> more of a cone instead of a trapezoid.
> >> This is best explained using a picture; see manual for details.
> >>
> >> carlos.
> >>
> >> Richard Ngonga wrote:
> >> > Thanks for that, I mean photo voltaic. I am modelling PV generators
> >> > that are able to dispatch reactive power(i.e operating at -0.95 to
> >> > 0.95 power factor).
> >> >
> >> >
> >> > > Date: Mon, 20 Aug 2012 01:34:09 -0400
> >> > > From: [email protected]
> >> > > To: [email protected]
> >> > > Subject: Re: PV Generators and Transformer modelling
> >> > >
> >> > > Um, an unfortunate crisscross with acronyms... by PV generators do you
> >> > > mean power-voltage as in classical power flow problem parlance or do
> >> > you
> >> > > rather mean "photo voltaic"?
> >> > >
> >> > > Richard Ngonga wrote:
> >> > > >
> >> > > > Hi there,
> >> > > >
> >> > > > I am working on a thesis on reactive power control on a distributed
> >> > > > network with transformers and PV generators. Can I model the PVs as
> >> > > > generators on a PV bus or should I model them as capacitors on a PQ
> >> > > > bus? I'm also having problems modelling transformers from a 20KV
> >> > > > network to a 0.4KV network; when I use the transformer ration 50 I
> >> > get
> >> > > > very large power flows and losses. The transformer data is: Sn
> >> > 400KVA,
> >> > > > Usc=10%, Uprm/Usec=20/0.4(KV) and Usec set=1.05.
> >> > > >
> >> > > > Regards
> >> > >
> >> > >
> >>
> >>
>
