Thank you all for your answers!
On 05.10.2012, at 16:19, "Mohammad Reza Salehizadeh" <[email protected]> wrote: > 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 > > >
