Admittance Bus (Y-Bus) Formation

This program can be used for admittance bus formation for load flow analysis.

Description

This program can be used for admittance bus formation for load flow analysis.

• MATLAB release: MATLAB 7.6 (R2008a)

[norhan2000 king]

iam interested in matlap program

[jehan hussian]

please send to me asolved example about ybas formation

[Duane Hanselman]

Of use to the author only. Here is what the file ybusppg.m contains:
num = 14;
fb = linedata(:,1); % From bus number...
tb = linedata(:,2); % To bus number...
r = linedata(:,3); % Resistance, R...
x = linedata(:,4); % Reactance, X...
b = linedata(:,5); % Ground Admittance, B/2...
a = linedata(:,6); % Tap setting value..
z = r + i*x; % Z matrix...
y = 1./z; % To get inverse of each element...
b = i*b; % Make B imaginary...

nbus = max(max(fb),max(tb)); % no. of buses...
nbranch = length(fb); % no. of branches...
Y = zeros(nbus,nbus); % Initialise YBus...
 % Formation of the Off Diagonal Elements...
 for k=1:nbranch
     Y(fb(k),tb(k)) = Y(fb(k),tb(k))-y(k)/a(k);
     Y(tb(k),fb(k)) = Y(fb(k),tb(k));
 end
 % Formation of Diagonal Elements....
 for m =1:nbus
     for n =1:nbranch
         if fb(n) == m
             Y(m,m) = Y(m,m) + y(n)/(a(n)^2) + b(n);
         elseif tb(n) == m
             Y(m,m) = Y(m,m) + y(n) + b(n);
         end
     end
 end
 Y % Bus Admittance Matrix..

[bibha boro]

thanx it helped me a lot