MATPOWER does not handle 3 winding transformers directly, so you would have to
convert it to an equivalent star formation of 2 winding transformers. The
psse2mpc() function can convert a 3-winding transformers in PSS/E RAW format
into the equivalent for MATPOWER, in case that would be useful.
Ray
> On Nov 27, 2019, at 12:24 PM, Winnie apiyo <[email protected]> wrote:
>
> Ray,
> Bus 92 was missing. I have f 400 kV , 220 kV, 132 kv , 66 kV, 33 kV and
> 11kV voltage levels. How do you model three winding transformers?
>
> i have the following error after running pf
> Warning: Matrix is singular to working precision.
> > In newtonpf (line 89)
> In runpf (line 204)
>
> Warning: Matrix is singular to working precision.
> > In newtonpf (line 89)
> In runpf (line 204)
>
> Warning: Matrix is singular to working precision.
> > In newtonpf (line 89)
> In runpf (line 204)
>
> Warning: Matrix is singular to working precision.
> > In newtonpf (line 89)
> In runpf (line 204)
>
> Warning: Matrix is singular to working precision.
> > In newtonpf (line 89)
> In runpf (line 204)
>
> Warning: Matrix is singular to working precision.
> > In newtonpf (line 89)
> In runpf (line 204)
>
> Warning: Matrix is singular to working precision.
> > In newtonpf (line 89)
> In runpf (line 204)
>
> Warning: Matrix is singular to working precision.
> > In newtonpf (line 89)
> In runpf (line 204)
>
> Warning: Matrix is singular to working precision.
> > In newtonpf (line 89)
> In runpf (line 204)
>
> Warning: Matrix is singular to working precision.
> > In newtonpf (line 89)
> In runpf (line 204)
>
>
> Newton's method power flow did not converge in 10 iterations.
>
> >>>>> Did NOT converge (0.17 seconds) <<<<<
>
> On Wed, Nov 27, 2019 at 7:13 PM Ray Zimmerman <[email protected]
> <mailto:[email protected]>> wrote:
> Do you have some bus numbers (either in the bus or branch matrix) that are
> not positive integers?
>
> Ray
>
>
>> On Nov 27, 2019, at 6:14 AM, Winnie apiyo <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> Good evening Ray,
>> It is now running but with this error:
>> Array indices must be positive integers or logical values.
>>
>> Error in ext2int (line 148)
>> bs(n2i(mpc.branch(:, F_BUS))) & ...
>>
>> Error in runpf (line 109)
>> mpc = ext2int(mpc);
>>
>> On Tue, Nov 26, 2019 at 10:58 PM Ray Zimmerman <[email protected]
>> <mailto:[email protected]>> wrote:
>> You’ll have to show us exactly what commands you are using to attempt to run
>> it. It sounds like you may be calling runpf(mpc) without first loading the
>> case into mpc. Normally, you’d do something like …
>>
>> mpc = loadcase('case118');
>> results = runpf(mpc);
>>
>> … or simply …
>>
>> results = runpf('case118');
>>
>> Hope this helps,
>>
>> Ray
>>
>>
>>> On Nov 26, 2019, at 12:18 PM, Winnie apiyo <[email protected]
>>> <mailto:[email protected]>> wrote:
>>>
>>> It is only running with no results. mpc empty , undefined function or
>>> variable mpc. I have been troubleshooting with no results. What are the
>>> possible mistakes?
>>>
>>> Sent from my iPhone
>>>
>>>> On 26 Nov 2019, at 20:26, Ray Zimmerman <[email protected]
>>>> <mailto:[email protected]>> wrote:
>>>>
>>>> There is no explicit limit to the size. Power flow for a 582 bus case
>>>> should be extremely fast, only a fraction of a second. On my 5 yr old
>>>> laptop a 13,000 bus system solves in ~0.3 sec.
>>>>
>>>> Ray
>>>>
>>>>> On Nov 24, 2019, at 3:12 PM, Winnie apiyo <[email protected]
>>>>> <mailto:[email protected]>> wrote:
>>>>>
>>>>> Thank you
>>>>>
>>>>> Sent from my iPhone
>>>>>
>>>>>> On 24 Nov 2019, at 21:54, Abhay Kumar <[email protected]
>>>>>> <mailto:[email protected]>> wrote:
>>>>>>
>>>>>> A list of test cases are available in Appendix D (Table D-18 to Table
>>>>>> D-23) of the MATPOWER user manual
>>>>>> <https://matpower.org/docs/MATPOWER-manual.pdf> I’m not sure if there
>>>>>> is a limit but MATPOWER can definitely handle 582 buses.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> Abhay Kumar
>>>>>> Graduate Teaching Assistant | Michigan Tech | Dept of ECE
>>>>>> E: [email protected] <mailto:[email protected]>
>>>>>> A: EERC 617, 1400 Townsend Dr Houghton MI 49931
>>>>>>
>>>>>>> On Nov 24, 2019, at 1:33 PM, Winnie apiyo <[email protected]
>>>>>>> <mailto:[email protected]>> wrote:
>>>>>>>
>>>>>>> good evening,
>>>>>>> What is the maximum number of buses that can be run in MATPOWER.? I
>>>>>>> have 582 buses and can't run power flow or it is just taking long to run
>>>>>>> regards
>>>>>>
>>>>
>>
>
