1 & 2. Vm should be set to 1, not zero, for a flat start. That might be your
problem.
3. MATPOWER 4.1 did not have continuation power flow. I recommend upgrading to
the latest version (5.1).
Ray
> On Sep 25, 2015, at 12:59 PM, [email protected] wrote:
>
>
> Hello,
> 1. I have tried to run the case again and below is the error that I get.
> runpf(t_case39rv_Orig)
>
> MATPOWER Version 4.1, 14-Dec-2011 -- AC Power Flow (Newton)
> Warning: Matrix is singular to working precision.
> > In newtonpf at 109
> In runpf at 220
> Warning: Matrix is singular to working precision.
> > In newtonpf at 109
> In runpf at 220
> Warning: Matrix is singular to working precision.
> > In newtonpf at 109
> In runpf at 220
> Warning: Matrix is singular to working precision.
> > In newtonpf at 109
> In runpf at 220
> Warning: Matrix is singular to working precision.
> > In newtonpf at 109
> In runpf at 220
> Warning: Matrix is singular to working precision.
> > In newtonpf at 109
> In runpf at 220
> Warning: Matrix is singular to working precision.
> > In newtonpf at 109
> In runpf at 220
> Warning: Matrix is singular to working precision.
> > In newtonpf at 109
> In runpf at 220
> Warning: Matrix is singular to working precision.
> > In newtonpf at 109
> In runpf at 220
> Warning: Matrix is singular to working precision.
> > In newtonpf at 109
> In runpf at 220
>
> Newton's method power did not converge in 10 iterations.
>
> Did not converge (0.07 seconds)
>
> 2. As I unterstand after looking into the code of runpf, it seems that the 0s
> entered in the data under Va and Vm seem to be the problem.
>
> 3. While trying to runcpf as mentioned in FAQ #5 I get the follwing error:
> ??? Undefined function or method 'runcpf' for input arguments of type
> 'struct'.
>
> I look fwd to some guidance / resolution pl.
>
> Thank you.
>
>
> Quoting Ray Zimmerman <[email protected]>:
>
>> 1. That is correct.
>> 2. That isn?t technically a question. I don?t know why, but you may want to
>> see FAQ #5 <http://www.pserc.cornell.edu/matpower/#pfconvergence> for ideas.
>> 3. MATPOWER does not have any functions that return eigenvalues directly,
>> though I don?t doubt that it has functions to help form some of your
>> matrices of interest.
>>
>>> On Sep 18, 2015, at 12:02 PM, [email protected]
>>> <mailto:[email protected]> wrote:
>>>
>>> Hi Ray,
>>> I am a new user of MATPOWER and MATACDC ana a Ph.D student @ University of
>>> Manitoba. I have downloaded and installed MATPOWER 4.1 with Matlab version
>>> 7.10.
>>> I am working with IEEE 39 bus case and noted that there is a discrepancy in
>>> terms of loads at buses with the data I have from
>>> http://publish.illinois.edu/smartergrid/ieee-39-bus-system/
>>> <http://publish.illinois.edu/smartergrid/ieee-39-bus-system/> and that in
>>> case39. The same has been highlighted in some postings here too.
>>>
>>> I have 3 simple questions:-
>>> Q1. A very basic one - When I enter data in the bus struct the value for Vm
>>> and Va can be 1 and 0 respectively. Since the Volt. magnitude and Volt.
>>> angle will be computed by load flow. (As I understand).
>>> Q2. I did enter the data as provided in the Univ. of Illinois site
>>> mentioned above and I found that my case did not converge?
>>> Q3. Is it possible to find the eigenvalues of AC-DC system using MATPOWER?
>>>
>>> Since I am working with this data can you please throw some light as to how
>>> I can resolve the issue. I will be very grateful.
>>>
>>> --------------------------
>>> Rajesh Vaid
>>>
>
> --------------------------
> Rajesh Vaid
