Dear D zimmerman
Please see below. It shows the success of power flow during the outage of line
14.
mpc=loadcase('case14');
>> mpc.branch(14,11)=0;
>> r=runpf(mpc)
r =
version: '2'
baseMVA: 100
bus: [14x13 double]
gen: [5x21 double]
branch: [20x17 double]
gencost: [5x7 double]
order: [1x1 struct]
et: 0.0060
success: 1
>> r.success
ans =
1
Kind Regards
Ahmad
________________________________
From: Ray Zimmerman <[email protected]>
To: MATPOWER discussion forum <[email protected]>
Sent: Thursday, April 4, 2013 7:59 AM
Subject: Re: outage of line 14 in IEEE 14 bus test system
>> 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
