what is mistake in my matlab code

Question

Quynh tran 2016-4-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/276699-what-is-mistake-in-my-matlab-code

评论： Rena Berman 2017-1-20

    Ybusn(linedata)=
 Columns 1 through 5
    14.7752 - 6.4985i   0.0000 + 0.0000i   0.0000 + 0.0000i -14.7752 + 6.4985i   0.0000 + 0.0000i
     0.0000 + 0.0000i  14.7752 - 6.4985i   0.0000 + 0.0000i   0.0000 + 0.0000i -14.7752 + 6.4985i
     0.0000 + 0.0000i   0.0000 + 0.0000i  14.7752 - 6.4985i   0.0000 + 0.0000i   0.0000 + 0.0000i
   -14.7752 + 6.4985i   0.0000 + 0.0000i   0.0000 + 0.0000i  26.1902 - 9.6810i -11.4150 + 3.1825i
     0.0000 + 0.0000i -14.7752 + 6.4985i   0.0000 + 0.0000i -11.4150 + 3.1825i  37.6052 -12.8635i
     0.0000 + 0.0000i   0.0000 + 0.0000i -14.7752 + 6.4985i   0.0000 + 0.0000i -11.4150 + 3.1825i
    Column 6
     0.0000 + 0.0000i
     0.0000 + 0.0000i
   -14.7752 + 6.4985i
     0.0000 + 0.0000i
   -11.4150 + 3.1825i
    26.1902 - 9.6810i
phi =
   0.9840 - 0.0134i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.0000 + 0.0000i
   0.0000 + 0.0000i   0.9808 - 0.0125i   0.0000 + 0.0000i   0.0000 + 0.0000i
   0.0000 + 0.0000i   0.0000 + 0.0000i   0.9795 - 0.0122i   0.0000 + 0.0000i
   0.0000 + 0.0000i   0.0000 + 0.0000i   0.0000 + 0.0000i  -0.0000 - 0.0000i

C =

   1.0000 + 0.0000i   0.0000 + 0.0000i   0.0000 + 0.0000i   0.0000 + 0.0000i
   0.0000 + 0.0000i   1.0000 + 0.0000i   0.0000 + 0.0000i   0.0000 + 0.0000i
   0.0000 + 0.0000i   0.0000 + 0.0000i   1.0000 + 0.0000i   0.0000 + 0.0000i
  -0.4669 + 0.0010i  -0.4669 + 0.0010i  -0.4669 + 0.0010i  -0.4669 + 0.0010i
  -0.2139 - 0.0103i  -0.2139 - 0.0103i  -0.2139 - 0.0103i  -0.2139 - 0.0103i
  -0.3193 + 0.0093i  -0.3193 + 0.0093i  -0.3193 + 0.0093i  -0.3193 + 0.0093i
Zbus=1/Ybus;
  PG1=0.0923;
  PG2=0.1368; %sau nay chinh lai de chon nut dieu chinh cong suat phat
  PG3=0.0792;
  Pgg=[PG1,PG2,PG3,1];
  %tinh dong dien nhanh
  e=ybusn(linedata);
  linebranch=zeros(nbr,3);
  Ig=phi*Pgg';
  Ibus=C*Ig;
  V=Zbus*Ibus;
  for k=1:nbr
      if nl(k)>0 && nr(k)>0
         Ibranch(k)=abs(-(V(nl(k))-V(nr(k)))*e(nl(k),nr(k)));
      end
  end
  Ibranch;
  linebranch(:,1)=linedata(:,1);
  linebranch(:,2)=linedata(:,2);
  linebranch(:,3)=Ibranch';
  disp([ '      nl        nr      |I|' ]);
  disp([linebranch]);
  %Kiem tra dong nhanh
  nbr=length(linedata(:,1));
  Imax=linedata(:,7);
  flag=0;
  niter=0;
  n=0
  while (flag==0&&niter<90)
      for n=1:nbr 
          if linebranch(n)>Imax(n)
              niter=niter+1;
              PG2=PG2-0.001;
              Pgg=[PG1,PG2,PG3,1];
              Ig=phi*Pgg';
              Ibus=C*Ig;
              V=Zbus*Ibus;
              for k=1:nbr
                  if nl(k)>0 && nr(k)>0
                      Ibranch(k)=abs(-(V(nl(k))-V(nr(k)))*e(nl(k),nr(k)));
                  end
              end            
          else
              flag=1;
          end
      end
  end
  Ibranch

I changed my new code. It work ok but the loop is not stop when Ibracnh<Imax.Please post your answer in a new answer let me know you online and answer you soon, don't post in comment.

4 个评论
显示 2更早的评论隐藏 2更早的评论

Quynh tran 2016-4-2

I got it

Rena Berman 2017-1-20

(Answers Dev) Restored Question.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Kuifeng 2016-4-2

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/276699-what-is-mistake-in-my-matlab-code#answer_216080

编辑：Walter Roberson 2016-4-2

在 MATLAB Online 中打开

i think maybe your loop never finishes.... endlesss loop in the 'Ibranch'

k = 1;
while k<=nbr % k run in the number of branch
    while Ibranch(k)>Imax(k) %to check Ibranh in each of branch
            PG2=PG2-0.001;
            Pgg=[0.0923,PG2,0.0792,1];
            V=Zbus*(C*(phi*Pgg'));
            k=k+1;
            % caculate again the Ibranch in branch;   
    end
end

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Quynh tran 2016-4-2

Many thanks for your answer. I tried as you talk, with your code, it even not work and freezing the program.

请先登录，再进行评论。

Answer 2

Walter Roberson 2016-4-2

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/276699-what-is-mistake-in-my-matlab-code#answer_216083

在 MATLAB Online 中打开

Your code has

while Ibranch(k)>Imax(k) %to check Ibranh in each of branch

but inside the "while" you do not appear to change Ibranch or Imax or k. If the condition becomes true once, then it appears that you are going to get an infinite loop.

However, you do have the line of code

caculate again the Ibranch in branch;

which, due to MATLAB's command / function equivalence, would be the same as calling

calculate('again', 'the', 'Ibranch', 'in', 'branch')

and we have no information about any function named "calculate" or how that function is going to modify Ibranch or Imax . It could happen. It just looks unlikely.

5 个评论
显示 3更早的评论隐藏 3更早的评论

Walter Roberson 2016-4-2

Your current posted code has an outer loop of "for k=1:nbr " and also has that as an inner loop. If you need an inner loop then you must use a different variable name for the index.

Quynh tran 2016-4-2