Thank you. If the lines' limitations is dependent to system, before running OPF, how can we determine which one (thermal or stability) is more restricting to set in RATE_A?
-Reza ________________________________ From: Ray Zimmerman <[email protected]> To: MATPOWER discussion forum <[email protected]> Sent: Friday, October 5, 2012 6:19 AM Subject: Re: comprehension question about RATE_A, RATE_B, RATE_C I believe it depends on the system and on the individual line. Presumably, you would set RATE_A to the less of the two limits. -- Ray Zimmerman Senior Research Associate 419A Warren Hall, Cornell University, Ithaca, NY 14853 phone: (607) 255-9645 On Oct 5, 2012, at 8:48 AM, Mohammad Reza Salehizadeh <[email protected]> wrote: As we know, there are two restricting constraints for the MVA flows a transmission line: a) Thermal limitation b) Stability limitation that (b) is more restricted. As Ray stated, currently MATPOWER consider RATE_A. Hence, Is it more reasonable to consider Stability limitation in RATE_A for short or mid-term power system analysis? > > >-Reza > > > >________________________________ > From: Ray Zimmerman <[email protected]> >To: MATPOWER discussion forum <[email protected]> >Sent: Friday, October 5, 2012 5:39 AM >Subject: Re: comprehension question about RATE_A, RATE_B, RATE_C > > >The only one that is used currently by MATPOWER is the long term rating >(RATE_A), which is used to limit the MVA flows when running an OPF. > > >-- >Ray Zimmerman >Senior Research Associate >419A Warren Hall, Cornell University, Ithaca, NY 14853 >phone: (607) 255-9645 > > > > >On Oct 4, 2012, at 9:51 AM, Cansu Yildirim <[email protected]> wrote: > >Dear All, >> >>I’m trying to model a network containing different voltage levels and I have >>to take account of the load of each branch in my network, so that my lines >>are not overloaded. >>Therefore I wanted to fill in data for the long, short and emergency ratings >>(RATE_A,RATE_B,RATE_C). As far as I didn’t get anything wrong, these ratings >>define the allowable magnitude of the flow. Can anybody give me a proper >>definition? And how do they influence my power flow? How does matpower use >>this information? >>And I’m not sure how to calculate these ratings. Is it enough to know the >>maximum allowable operating current and voltage rating for the cables? >> >>I would be grateful for any help. >> >>Kind regards, >> >>Cansu Yildirim > > >
