RE: Overwriting specific in loop data before running runpf

[Gang Huang]

Hi Marc,

 

Defining a new variable (if you don’t want to load the same case data multiple 
times) could help you fix the problem easily. Below is an example that may help 
you.

 

mpc = loadcase('case6ww');                    % load the raw data;

for i = 1 : 5

data = mpc;                                        % duplicate the raw data;

data.bus(:, 3) = data.bus(:, 3) / i;   % do your modification;

results = runpf(data);                        % run the modified data;

end

 

Best regards,

 

Gang

 

From: bounce-120557872-73377...@list.cornell.edu 
[mailto:bounce-120557872-73377...@list.cornell.edu] On Behalf Of Marc Gebhardt
Sent: Monday, June 13, 2016 8:49 AM
To: MATPOWER-L@cornell.edu
Subject: Overwriting specific in loop data before running runpf

 

Hi,

 

if i could minimize my problem in an easier case:

 

i specified my knots and branches in a case file of my matpower direction.

now i want to show the influence of varying one parameter of the branches.

for example the resistance of one line influences the losses.

 

so i bulit a for-loop, which should overwrite the input of the runpf 
calculation.

 

how can i adress the workspace without changing the case-file every time?

my solution (lower in the text) doesn't work, cause it calculates every time 
with the given value in the case-file.

 

clear all;

%loading of the given topology

run case_123.m;

%setting the steps

n=5;

stepsize=0.5;

%loop for the steps

for i=1:n;

    %calc the new resistance

    resis=-(n+1)/2*stepsize+stepsize*(i);

    %write it in the case (!!!!!!!!!!!!!!!!!!!!! and this is wrong)

    ans.branch(2,3)=resis;

    %doing the powerflowcalc

    mpRes=runpf('case_pst1');

    %output of the wanted values...

    output(i,1)=resis;

    output(i,2)=mpRes.branch(1,16);

 

end

 

how can i change the single value in a case with a loop for comparing the 
results?

 

thank you

marc