>> define_constants
>> mpc = loadcase('case14');
>> mpc.branch(14, BR_STATUS) = 0;
>> opt = mpoption('OUT_ALL', 0);
>> r = runpf(mpc, opt);
MATPOWER Version 4.1+, 28-Nov-2012 -- AC Power Flow (Newton)
Warning: Matrix is singular to working precision.
> In newtonpf at 109
In runpf at 224
<warning repeated 9 more times>
Newton's method power did not converge in 10 iterations.
>> r.success
ans =
0
The results are telling you that the power flow did not converge (that is, it
was unable to find a solution) … and that information is "correct and reliable"
;-) … so, no, any bus voltages, flows, etc will not correspond to a solved
power flow.
--
Ray Zimmerman
Senior Research Associate
419A Warren Hall, Cornell University, Ithaca, NY 14853
phone: (607) 255-9645
On Apr 4, 2013, at 4:55 AM, ahmad rezaee <[email protected]> wrote:
> Dear Dr Zimmerman
>
> In IEEE 14 bus test system when I make out line 14 and run power flow,
> matpower messages: "Warning: Matrix is singular to working precision.". This
> message means that jacobian matrix is singular. Yes? Matpower gives me some
> results for power flow. Are the results correct and reliable? (I know this
> problem occurs since bus 8 will be islanded.)
>
> Kind regards
>
> Ahmad
