On Sep 4, 2013, at 12:44 PM, dharmesh dabhi wrote: > HELLO, > I have two questions > .Q:1 How Continuous power flow (CPF) different from Newton raphson( N.R) ? AC power flow solution is carried out with a Newton-Rhapson method for a fixed generation/loading profile. Continuation power flow consists of a series of AC power flows where the loading/generation is increased/decreased at each step. Instead of simply increasing/decreasing the loading/generation and solving repeated power flows, an extra equation is appended to the original power flow equations in a continuation power flow. This extra equation describes how the current step is related to its previous one. This is done so because at near loading limit, the Jacobian matrix becomes ill-conditioned and a simple power flow may diverge. The extra equation helps in eliminating this ill-conditioning issue. You may want to refer this classical paper on continuation power flow by Ajjarapu and Christy http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=141737&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel1%2F59%2F3807%2F00141737 > Q:2 What are the problem facing in N.R Method for large number of population > size during calculation of 'ATC' ? > > I am assuming here by large population size you mean large number of variables.
The biggest bottleneck is factoring the Jacobian matrix repeatedly. This paper might be of interest to you http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=736300&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel4%2F59%2F15860%2F00736300 What is the problem that you are trying to solve? How big is your system? Shri > > Sincerly, > Dharmesh dabhi
