On Aug 15, 2012, at 9:03 PM, Carlos E Murillo-Sanchez wrote: > I can envision that this method of randomly connecting two systems might > easily create unsolvable systems, with wild angular differences even if > solvable. That is not how transmission networks are designed.
Thanks for your comments Carlos. Any tips on how to go about connecting test cases in an engineered way rather than just naively putting in random lines? If anyone has larger test cases (> 3375 buses) (not neccessarily MatPower format) and willing to share it, I would really love that :) Thanks, Shri > > Shri wrote: >> Hi, >> I am trying to create a bigger test case by duplicating a MatPower test >> case (>= 2383 buses) multiple times. To have connectivity between each of >> the bigger areas, I've added randomly chosen tie lines. However, I am not >> able to get power flow to converge. >> Monitoring the residual norm shows that Newton convergence is linear in >> the first few steps and then it diverges. I suspect that this might be due >> to the initial guess given to Newton. My premise is based on observing that >> if a flat start is chosen for some (or all?) of the MatPower test cases (>= >> 2383 buses), Newton doesn't converge and has a similar divergence pattern. >> >> I was wondering whether the bus(:,VM:VA), which is part of the initial >> guess to Newton, data was computed using some algorithm or provided by the >> test case data provider. >> >> Thanks and appreciate your help as always! >> Shri >> >> > >
