Re: How to load Pd in a loadprofile ,when load buses are approximately 30 .

[Ray Daniel Zimmerman]

I’m not sure I understand the question. Are you asking if I can provide an 
example of a “typical” 24-hour load profile? If so, I’m afraid not. I’m sure 
there are many papers and other on-line sources with such data, but you would 
have to do some searching and evaluate for yourself which data fit your needs.

    Ray


On Sep 29, 2021, at 12:55 AM, MALIHA SHAH 
<mshaheep19....@student.nust.edu.pk<mailto:mshaheep19....@student.nust.edu.pk>> 
wrote:

Respected Ray,
Thank you,  your above explaination helped.
I want to know how are loadprofile values defined? As per observation they were 
random(total/actual load values) throughout 12 hours. Can you suggest 24 hour 
or 12 hour load variation throughout a day(load profile values in scaling 
factors ), which can be anticipated as peak hours, morning and eveing ramp etc.
Will be thankful for your time .

Maliha

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________________________________
From: 
bounce-125927883-89272...@list.cornell.edu<mailto:bounce-125927883-89272...@list.cornell.edu>
 
<bounce-125927883-89272...@list.cornell.edu<mailto:bounce-125927883-89272...@list.cornell.edu>>
 on behalf of Ray Daniel Zimmerman <r...@cornell.edu<mailto:r...@cornell.edu>>
Sent: Monday, September 20, 2021 7:54:11 PM
To: MATPOWER-L <matpowe...@list.cornell.edu<mailto:matpowe...@list.cornell.edu>>
Subject: Re: How to load Pd in a loadprofile ,when load buses are approximately 
30 .

Hi Maliha,

The profile values are simply scale factors applied to the parameters in the 
base case file. But the base case parameters can be whatever you find 
convenient, e.g. some mean output value, and need not be the installed 
capacity. Certainly, if your base case parameters reflect the installed 
capacity, then the profile numbers would always need to be less than or equal 
to 1.

Regarding curtailment of wind, there are a number of reasons that it may be 
optimal to curtail wind, depending on the type of optimization you are running. 
A fairly simple example is the situation where it is less costly to curtail the 
wind in a high-wind scenario than it is to provide the reserves or ramping 
needed to cover the low-wind scenario. In a deterministic optimization the only 
reason to curtail wind would be due to network constraints, but in a stochastic 
framework, it can be optimal to curtail wind simply because you can’t 
necessarily count on it being there.

    Ray



On Sep 20, 2021, at 4:33 AM, MALIHA SHAH 
<mshaheep19....@student.nust.edu.pk<mailto:mshaheep19....@student.nust.edu.pk>> 
wrote:

respected Ray,
Thanks for the explanation of the wind profile. Still, I have some confusion in 
the third and second columns of the profile values. The values more than 1, 
such as 1.14 (114% ) indicate wind availability at that hour, which is more 
than wind installed capacity. If it is so, then the wind must be despatched at 
full capacity (100%) but as a result wind power is curtailed. The 3rd scenario 
especially in the results, contradicts the profile scaled factors applied to 
PMAX base values.
If it is due to the usage of transmat , can I know the concept how transmat 
controls the despatched values(lowered Pmax than available) of wind generators, 
why are renewables not despatched fully as they must according to the maximum 
availability? If it is due to congestion of the lines connected to wind 
installed bus then how can we check the power flow at that respective bus in 
results?

Will remain thankful for your suggestions.

Maliha
________________________________
From: 
bounce-125891536-89272...@list.cornell.edu<mailto:bounce-125891536-89272...@list.cornell.edu>
 
<bounce-125891536-89272...@list.cornell.edu<mailto:bounce-125891536-89272...@list.cornell.edu>>
 on behalf of Ray Daniel Zimmerman <r...@cornell.edu<mailto:r...@cornell.edu>>
Sent: Tuesday, 7 September 2021 1:32 AM
To: MATPOWER-L <matpowe...@list.cornell.edu<mailto:matpowe...@list.cornell.edu>>
Subject: Re: How to load Pd in a loadprofile ,when load buses are approximately 
30 .

The other fields of the windprofile struct specify exactly how the values are 
used.

windprofile = struct( ...
    'type', 'mpcData', ...
    'table', CT_TGEN, ...     % modify the gen matrix
    'rows', 1, ...
    'col', PMAX, ...          % modify the PMAX column
    'chgtype', CT_REL, ...    % scale the existing value
    'values', [] );

So, these ares simple scale factors for the PMAX column of the gen matrix. That 
is, the PMAX values found in the base case are scaled by the values provided in 
corresponding period and scenario.

    Ray



On Sep 6, 2021, at 12:20 PM, MALIHA SHAH 
<mshaheep19....@student.nust.edu.pk<mailto:mshaheep19....@student.nust.edu.pk>> 
wrote:

Respected Ray,
can you explain the profile values in example code "ex_wind_profile", How are 
they defined?
The valves are defined as given below. I think 0.72 is 75 % output of wind 
generators but what does 1.18 indicate?
but the results are contradicting with this idea therefore let me know the 
concept behind it.

windprofile.values (:, :, 1) = [
 0.72 0.80 0.88;
0.49 0.65 0.81;
0.36 0.60 0.84;
0.50 0.82 1.14;
0.60 1.00 1.40;
0.22 0.70 1.18;
0.00 0.50 1.00;
0.33 0.85 1.37;
0.46 1.00 1.54;
0.54 1.10 1.66;
0.48 1.06 1.64;
0.35 0.95 1.55;
________________________________
From: 
bounce-125771441-89272...@list.cornell.edu<mailto:bounce-125771441-89272...@list.cornell.edu>
 
<bounce-125771441-89272...@list.cornell.edu<mailto:bounce-125771441-89272...@list.cornell.edu>>
 on behalf of Ray Daniel Zimmerman <r...@cornell.edu<mailto:r...@cornell.edu>>
Sent: Thursday, 15 July 2021 1:37 AM
To: MATPOWER-L <matpowe...@list.cornell.edu<mailto:matpowe...@list.cornell.edu>>
Subject: Re: How to load Pd in a loadprofile ,when load buses are approximately 
30 .

According to the error message, it seems that the dimensions of your 
profile.values is not consistent with the dimensions of your transition 
probability matrices. The 2nd dimension of profiles is 3 (i.e for 3 scenarios), 
but the transition probability matrices appear to be defined for a single 
scenario.

As far as plotting, there are a few plotting functions that are general and 
documented (e.g. plot_uc(), plot_gen(), plot_storage()), but the functions used 
in the test files for plotting are specific to those cases. You would probably 
need to modify them to work for your own cases.

    Ray


On Jul 14, 2021, at 7:29 AM, MALIHA SHAH 
<mshaheep19....@student.nust.edu.pk<mailto:mshaheep19....@student.nust.edu.pk>> 
wrote:

Respected Zimmermen!
How can I resolve bellow error. As I have built a code from stochastic  DC OPF 
model ex 4, for multiple periods. where I used command:
  t_most_suc_new(0, 1, 1, ' location name').
This is for secure stochastic uc model ploting. But i edited this function 
according to my file. Still I am not confirm if we want to generate graph
we have to built complete function ? How can we learn about graph and plots in 
Matpower and Most.

Error:

Error using loadmd (line 399)
loadmd: scenarios dimension of profiles(1).values (3) must be 1 or nj_max = 1


Highly thankful for your suggestions.
Maliha
________________________________
From: 
bounce-125755821-89272...@list.cornell.edu<mailto:bounce-125755821-89272...@list.cornell.edu>
 
<bounce-125755821-89272...@list.cornell.edu<mailto:bounce-125755821-89272...@list.cornell.edu>>
 on behalf of Ray Daniel Zimmerman <r...@cornell.edu<mailto:r...@cornell.edu>>
Sent: Thursday, 8 July 2021 7:54 PM
To: MATPOWER-L <matpowe...@list.cornell.edu<mailto:matpowe...@list.cornell.edu>>
Subject: Re: How to load Pd in a loadprofile ,when load buses are approximately 
30 .

Unfortunately, setting up these profiles is a little more complex than I would 
like.

First of all, setting rows to 0 will make the profile apply to every unit in 
the final gen matrix, including non-wind generators and even dispatchable 
loads. So that’s probably not what you want.

However, there is a subtlety in how rows is interpreted, depending on whether 
you are calling the getprofiles() function with an idx argument or not. If not, 
then rows refers to the row index in the final gen matrix, i.e. gen(rows, …). 
If so, then rows is an index into the idx vector provided to getprofiles(), so 
it applies to gen(idx(rows), …). This allows you to add wind generators using 
add_wind() and then set up your profile with rows that address them 
consecutively as 1, 2, 3 …

Hope this helps,

    Ray



On Jul 7, 2021, at 3:56 PM, MALIHA SHAH 
<mshaheep19....@student.nust.edu.pk<mailto:mshaheep19....@student.nust.edu.pk>> 
wrote:

thankyou for the suggestion.
Another question is how to use wind profile provided in example code for more 
than 1 generator. I changed the rows value from 1 to 0 in order to apply for 
all but the results indicate as the other generators are off( profile does not 
work for all generators). Secondly,  from the discussion list I got an answer 
explaining the row and values field of wind_profile function for 3 generators. 
But it did not work. You can check the photos attached, showing the results and 
the answer from discussion list which I tried in my code.

thanking you for your time.

Maliha Shah
________________________________
From: 
bounce-125732211-89272...@list.cornell.edu<mailto:bounce-125732211-89272...@list.cornell.edu>
 
<bounce-125732211-89272...@list.cornell.edu<mailto:bounce-125732211-89272...@list.cornell.edu>>
 on behalf of Ray Daniel Zimmerman <r...@cornell.edu<mailto:r...@cornell.edu>>
Sent: Thursday, 24 June 2021 11:20 PM
To: MATPOWER-L <matpowe...@list.cornell.edu<mailto:matpowe...@list.cornell.edu>>
Subject: Re: How to load Pd in a loadprofile ,when load buses are approximately 
30 .

The example in 
most/lib/t/ex_load_profile.m<https://matpower.org/docs/ref/matpower7.1/most/lib/t/ex_load_profile.html>
 will apply to all loads, whether fixed (PD/QD columns of bus) or dispatchable 
(negative gen). The profiles in MOST use the 
apply_changes()<https://matpower.org/docs/ref/matpower7.1/lib/apply_changes.html>
 function described in Section 9.3.5 of the User’s 
Manual<https://matpower.org/docs/MATPOWER-manual-7.1.pdf>. See Table 9-4 for 
the details of how to make your changes apply to only fixed, or only 
dispatchable, etc.

Hope this helps,

    Ray



On Jun 24, 2021, at 1:08 AM, MALIHA SHAH 
<mshaheep19....@student.nust.edu.pk<mailto:mshaheep19....@student.nust.edu.pk>> 
wrote:

Respected Ray,
How can I make a varying loadprofile, which contains 30 load buses 
approximately.  As in the example most , there was one load bus which was coded 
negative generation . How can the Pd given in case 30 included in profiles in 
order to run it smoothly like in the example.

Will be thankful.
Maliha


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