Sir,If i want to increase load in continuation power flow by step of 1 MW, What should be the step size of Lamda. My system base case load is 5000 MW. As CPF accuracy depends on step-size. Thanks.
From: Jose Luis Marin <mari...@gridquant.com> Sent: Mon, 10 Aug 2015 18:53:11 To: MATPOWER discussion forum <matpowe...@list.cornell.edu> Subject: Re: PV curve using CPF Shruti is right, the value you obtain for lambda is valid for all the network, since voltage collapse is a global phenomenon (in other words, you';ll see a nose point at the same value of lambda regardless of which bus you choose to plot). Remember that lambda represents a fraction along the vector of injections linearly iterpolating [P_base, Q_base] to [P_target, Q_target]. The value of Lambda at the nose point is NOT the maximum loading point for that bus; rather, it is the maximum loading value along the path to the particular load/gen profile chosen as a target. Of course, one may wonder about this other problem: for a given profile [P_base, Q_base], what is the target direction [P_target, Q_target] for which one would obtain the shortest value of critical lambda? If this is what you';re thinking about, then it is in general a hard problem. I suggest these references by Ian Dobson, on the concept of "shortest distance" to voltage collapse: http://www.ece.wisc.edu/~dobson/PAPERS/publications.html#loading -- Jose L. Marin Gridquant España SL Grupo AIA On Mon, Aug 10, 2015 at 6:23 AM, nilesh patel <nk2...@rediffmail.com> wrote: Sir,When we run continuation power flow for particular system, we get p-v curve for selected bus. using this p-v curve, we can find Voltage stability Margin (in MW) on that bus by difference of operating point to nose point lamda. I agree lambda at nose point provides maximum loading value but that is for that bus only for which p-v curve is plotted. My question is How to find Voltage Stability Margin for whole Network using P-V curve ? I mean how to find maximum lamda for whole network using p-v curve? Thanks. From: "Abhyankar, Shrirang G." <abhy...@anl.gov> Sent: Fri, 07 Aug 2015 22:31:31 To: MATPOWER discussion forum <matpowe...@list.cornell.edu> Subject: Re: PV curve using CPF I donⴠquite understand your question, can you please elaborate. The maximum value of loading scaling parameter ᬡmbda⠧ives a measure of how much power can be transferred for a given transfer direction. So, lambda is also a measure of the nose point for the whole network. Shri From: nilesh patel <nk2...@rediffmail.com> Reply-To: MATPOWER discussion forum <matpowe...@list.cornell.edu> Date: Friday, August 7, 2015 at 8:46 AM To: matpower-l <matpowe...@list.cornell.edu>, MATPOWER-L <MATPOWER-L@cornell.edu> Subject: PV curve using CPF Dear Sir, P-V curve solution using continuation power flow gives nose point (maximum loading point) for individual bus. My question is - How to get nose point for whole network (all buses) using PV curve ? I want to find network voltage stability margin rather than individual bus margin using CPF. Thanks. Nilesh Patel Get your own FREE website, FREE domain & FREE mobile app with Company email. Know More >
