matlab 应求PQ分解法进行潮流计算

matlab 应求PQ分解法进行潮流计算

%本程序的功能是利用PQ分解法进行潮流计算

clear

clc

n=input('请输入节点数：n=');

nl=input('请输入支路数：nl=');

isb=input('请输入平衡母线节点号：isb=');

pr=input('请输入误差精度：pr=');

disp('请输入由支路参数形成的矩阵：B1=');

%输入B1

[fname, pname]= uigetfile('*.xls');

file=[pname fname];

x=xlsread(file);

B1=[x(:,1),x(:,2),(x(:,3)+x(:,4)*i),x(:,5)*i,x(:,6),x(:,7)];

disp('请输入由节点参数形成的矩阵：B2=');

%输入B2

[fname, pname]= uigetfile('*.xls');

file=[pname fname];

y=xlsread(file);

B2=[(y(:,1)+y(:,2)*i),(y(:,3)+y(:,4)*i),y(:,5),y(:,6),y(:,7),y(:,8)];

disp('请输入由节点号及其对地阻抗形成的矩阵：X=');

%输入X

[fname, pname]= uigetfile('*.xls');

file=[pname fname];

z=xlsread(file);

X=z;

na=input('请输入PQ节点数na=');

Y=zeros(n);YI=zeros(n);e=zeros(1,n);f=zeros(1,n);V=zeros(1,n);O=zeros(1,n);

for i=1:n

if X(i,2)~=0;

p=X(i,1);

Y(p,p)=1./X(i,2);

end

end

for i=1:nl

if B1(i,6)==0

p=B1(i,1);q=B1(i,2);

else p=B1(i,2);q=B1(i,1);

end

Y(p,q)=Y(p,q)-1./(B1(i,3)*B1(i,5));

YI(p,q)=YI(p,q)-1./B1(i,3);

Y(q,p)=Y(p,q);

YI(q,p)=YI(p,q);

Y(q,q)=Y(q,q)+1./(B1(i,3)*B1(i,5)^2)+B1(i,4)./2;

YI(q,q)=YI(q,q)+1./B1(i,3);

Y(p,p)=Y(p,p)+1./B1(i,3)+B1(i,4)./2;

YI(p,p)=YI(p,p)+1./B1(i,3);

end %求导纳矩阵

G=real(Y);B=imag(YI);BI=imag(Y);

for i=1:n

S(i)=B2(i,1)-B2(i,2);

BI(i,i)=BI(i,i)+B2(i,5);

end

P=real(S);Q=imag(S);

for i=1:n

e(i)=real(B2(i,3));

f(i)=imag(B2(i,3));

V(i)=B2(i,4);

end

for i=1:n

if B2(i,6)==2

V(i)=sqrt(e(i)^2+f(i)^2);

O(i)=atan(f(i)./e(i));

end

end

for i=2:n

if i==n

B(i,i)=1./B(i,i);

else IC1=i+1;

for j1=IC1:n

B(i,j1)=B(i,j1)./B(i,i);

end

B(i,i)=1./B(i,i);

for k=i+1:n

for j1=i+1:n

B(k,j1)=B(k,j1)-B(k,i)*B(i,j1);

end

end

end

end

p=0;q=0;

for i=1:n

if B2(i,6)==2

p=p+1;k=0;

for j1=1:n

if B2(j1,6)==2

k=k+1;

A(p,k)=BI(i,j1);

end

end

end

end

for i=1:na

if i==na

A(i,i)=1./A(i,i);

else k=i+1;

for j1=k:na

A(i,j1)=A(i,j1)./A(i,i);

end

A(i,i)=1./A(i,i);

for k=i+1:na

for j1=i+1:na

A(k,j1)=A(k,j1)-A(k,i)*A(i,j1);

end

end

end

end

ICT2=1;ICT1=0;kp=1;kq=1;K=1;DET=0;ICT3=1;

while ICT2~=0|ICT3~=0

ICT2=0;ICT3=0;

for i=1:n

if i~=isb

C(i)=0;

for k=1:n

C(i)=C(i)+V(k)*(G(i,k)*cos(O(i)-O(k))+B