# Re: Combined Transmission System and Distribution Grid in Matpower

``` I much appreciate if anyone can help me in details and steps to do such a
simulation in Matpower. Thanks.```
```

On Sat, Apr 7, 2018 at 12:36 PM, Arkan Arkan <arkan.m2...@gmail.com> wrote:

> I much appreciate if anyone can help me in details and steps to do such a
> simulation in Matpower. Thanks.
>
> On Sat, Apr 7, 2018 at 12:29 PM, Ahmad Sadiq Abubakar <
>
>> I think the 33 nodes is a radial network, issues of convergence..
>>
>> On Sat, Apr 7, 2018, 8:23 PM Arkan Arkan <arkan.m2...@gmail.com> wrote:
>>
>>> Thanks Ahmad. Would you, please, explain more and provide some code.
>>> Please consider that I am not a Power system student. So, I appreciate your
>>> detailed ans step by step description to do such a simulation in the
>>> Matpower. For example, If I want to attach a 33 bus (case 33 in the
>>> Matpower) to 14 bus (case 14) as a load bus.
>>>
>>> Thank you so much for your help.
>>>
>>> On Sat, Apr 7, 2018 at 11:57 AM, Ahmad Sadiq Abubakar <
>>>
>>>> I don't think there's a problem with your proposed integrated
>>>> transmission-distribution grid as long as the following is taken care of.
>>>> 1) The distribution network section is not radial... Since conventional
>>>> load flow do not converge fine with radial network.
>>>> 2) At point of common coupling between transmission and distribution,
>>>> In modelling the PQ load at transmission by a real distribution network you
>>>> may account or assume the transformer impedances neglected. Such that if
>>>> you assumed ideal transformer (lossless) the resistance is zero and the
>>>> transformer is modeled by a very small reactance.
>>>>
>>>> For now this is what I can remember. I recently model such integrated
>>>> grid.
>>>>
>>>> Ahmad A. S.
>>>>
>>>> On Sat, Apr 7, 2018, 7:43 PM Arkan Arkan <arkan.m2...@gmail.com> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I am wondering how is it possible to simulate combined transmission
>>>>> system and distribution grid in one place (global one) in the Matpower? I
>>>>> want to see the effects of contingencies on transmission grid in the
>>>>> distribution grid measurements values. Actually I want to attach a
>>>>> distribution grid to one of the load buses of transmission grid and run
>>>>> the
>>>>> whole network. I highly welcome any suggestion.
>>>>>
>>>>> Thanks for any help in advance.
>>>>>
>>>>>
>>>>>
>>>>>
>>>
>
```