%本程序的功能是利用PQ分解法进行潮流计算clearclcn=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B1fname, 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B2fname, 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Xfname, 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); endendfor 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);endP=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);endfor i=1:n if B2(i,6)=2 V(i)=sqrt(e(i)2+f(i)2); O(i)=atan(f(i)./e(i); endendfor 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 endendp=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 endendfor 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 endendICT2=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)+BI(i,k)*sin(O(i)-O(k); end DP1(i)=P(i)-V(i)*C(i); DP(i)=DP1(i)./V(i); DET=abs(DP1(i); if DET=pr ICT2=ICT2+1; end end end Np(K)=ICT2; if ICT2=0 for i=2:n DP(i)=B(i,i)*DP(i); if i=n IC1=i+1; for k=IC1:n DP(k)=DP(k)-B(k,i)*DP(i); end else for LZ=3:i L=i+3-LZ; IC4=L-1; for MZ=2:IC4 I=IC4+2-MZ; DP(I)=DP(I)-B(I,L)*DP(L); end end end end for i=2:n O(i)=O(i)-DP(i); end kq=1;L=0; for i=1:n if B2(i,6)=2 C(i)=0;L=L+1; for k=1:n C(i)=C(i)+V(k)*(G(i,k)*sin(O(i)-O(k)-BI(i,k)*cos(O(i)-O(k); end DQ1(i)=Q(i)-V(i)*C(i); DQ(L)=DQ1(i)./V(i); DET=abs(DQ1(i); if DET =pr ICT3=ICT3+1; end end end else kp=0; if kq=0; L=0; for i=1:n if B2(i,6)=2 C(i)=0;L=L+1; for k=1:n C(i)=C(i)+V(k)*(G(i,k)*sin(O(i)-O(k)-BI(i,k)*cos(O(i)-O(k); end DQ1(i)=Q(i)-V(i)*C(i); DQ(L)=DQ1(i)./V(i); DET=abs(DQ1(i); end end end end Nq(K)=ICT3; if ICT3=0 L=0; for i=1:na DQ(i)=A(i,i)*DQ(i); if i=na for LZ=2:i L=i+2-LZ; IC4=L-1; for MZ=1:IC4 I=IC4+1-MZ; DQ(I)=DQ(I)-A(I,L)*DQ(L); end end else IC1=i+1; for k=IC1:na DQ(k)=DQ(k)-A(k,i)*DQ(i); end end end L=0; for i=1:n if B2(i,6)=2 L=L+1; V(i)=V(i)-DQ(L);