MATPOWER uses the voltage values from the bus and gen matrices to create the 
starting point, so if you want a flat start …

define_constants;
mpc = loadcase(<your case file>);
mpc.bus(:, VM) = 1;
mpc.bus(:, VA) = 0;
mpc.gen(:, VG) = 1;
results = runpf(mpc);

— Ray


> On Feb 18, 2015, at 8:37 PM, Shruti Rao <sra...@asu.edu> wrote:
> 
> Hi all,
> 
> Does MATPower use flat start to get the initial estimate when solving the 
> power flow problem (The function runpf).  I tried to find the answer to this 
> question in the manual but could not get an answer. If it does not use flat 
> start by default, is there a way I can make it use flat start? I was not able 
> to find any such option in the user manual that would force MATPower to use 
> flat start for getting the initial estimate.
> 
> I appreciate your time and advice.
> 
> Thank you,
> Shruti Rao,
> Arizona State University

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