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
