Distributed Photovoltaic Grid Transformers

Appendix A

MATLAB^® Program for a Three-Limb Core Design [16]

%This program calculates the core sections for a 3MVA,3phase, 436 volts/11KV Y-Y transformer

%Reads yoke data values from an exel file that was obtained by using %microstation (program similar to autocad)

a = xlsread(‘99-yoke (bottom half)with ducts.xlsx’);%reads data from an xls file

xyoke = a(:,1);%assign first column to x

yyoke = a(:,2);%assign second column to y for i = 0:26

 d = 2+(4*i);

 b = 1+(4*i);

 c = 3+(4*i);

 l = xyoke(d)-xyoke(b);

 h = yyoke(c)-yyoke(d);

 Lengthyoke(i+1) = l;%stores yoke length for the cross sections

 Widthyoke(i+1) = h;%stores yoke widths for the cross sections

end

Lengthyoke;

Widthyoke;

%Reads leg data values from an exel file that was obtained ...