Please look carefully at section 6.4.3 and especially Figure 6-6 in the User’s
Manual <http://www.pserc.cornell.edu/matpower/docs/MATPOWER-manual-5.1.pdf>. I
think you may have gotten your Q1 and Q2 parameters switched.
Ray
> On Apr 14, 2016, at 9:46 AM, Mirish Thakur <[email protected]> wrote:
>
> Dear Prof. Ray,
>
> Yes, you are correct. I have set QC1MIN = 0, QC1MAX = 0, QC2MAX = 4.84 and
> QC2MIN = -3.28. But I have doubt on the value of Qg=4.60 MVAr. Generally, in
> capability curve, if generator has to produce more reactive power then it
> has to reduce its active power generation to remain within the area defined
> by its upper boundary (field heating limit). Here in my case if I fix the
> value of Pg=9.5 MW and if generator produces Qg=4.60 MVAr , then if we
> intersect these two points (MVA) isn't it working beyond its capability
> curve ? I have attached modified PQ capability curve diagram.
>
> Thanks and regards
> Mirish
>
> On Wed, Apr 6, 2016 at 11:04 PM, Ray Zimmerman <[email protected]
> <mailto:[email protected]>> wrote:
> I assume you mean that you also set QC1MIN = 0, QC1MAX = 0, QC2MAX = 4.84 and
> QC2MIN = -3.28?
>
> If so, then I’m not sure where you are getting the 0.24 MVAr. The allowable
> range at 10 MW would be -3.28 to +4.84 MVAr … at 9.5 MW it would be 0.95
> times those numbers, i.e. -3.12 to +4.60 MVAr.
>
> Which is what you see.
>
> Ray
>
>
>
>
>> On Apr 6, 2016, at 11:16 AM, Mirish Thakur <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> Dear Prof. Ray,
>>
>> I have modeled capability curve in triangular shape. Ex. P1=0, P2= 10 MW,
>> Qmax =4.84, Qmin =-3.28, Pmax=Pmin=9.5. So at this Pmax limit generator
>> should produce reactive power =0.24 MVAr but in opf it generates 4.60 MVAr.
>> I don't understand the reason because I have fixed the active power
>> generation and Qg should generate from zero to vertical max limit of
>> capability curve. I read previous answers on forum
>> https://www.mail-archive.com/matpower-l%40cornell.edu/msg03986.html
>> <https://www.mail-archive.com/matpower-l%40cornell.edu/msg03986.html> but
>> could not understand what changes you have made in hasPQcap function. Thank
>> you for your time.
>>
>> regards
>> Mirish
>
>
> <capability (2).jpg>
