Hi Trivik Verma, This is Matlab error message appears when the matrix inverse is not possible because of singular matrix. This shows that the power system becomes unhealthy or ill-conditioning because of opening several lines. Kindly refer previous posts on this topic.
http://www.mail-archive.com/[email protected]/msg01678.html On Tue, Feb 28, 2012 at 4:05 PM, Trivik <[email protected]> wrote: > Could anyone help me?? > > I am viewing a power grid using MATPOWER and for my simulations I need to > remove a node together with its links. By doing so, I am changing > mpc.branch(links,:) = 0. After removing the respective links, I am > calculating PTDFs again. The first time is fine, but in the event of > redistribution of flows, the next time I am removing about 10 percent of > the nodes and calculating PTDFs. I get a warning as follows, > > Warning: Matrix is close to singular or badly scaled. > Results may be inaccurate. RCOND = 4.060450e-019. > > Do I have to remove something else from the mpc struct as well? > > cheers, > Trivik > ------------------------------------------------------------- WITH REGARDS, V. Ravikumar Pandi, Masdar Institute, Abu Dhabi, United Arab Emirates - 54224. mobile : +971 5522 78027. ------------------------------------------------------------- HAVE A NICE DAY -------------------------------------------------------------
