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1、牛顿—拉夫逊法潮流计算程序ByYuluo%牛顿--拉夫逊法进行潮流计算n=input('请输入节点数：n=');n1=input('请输入支路数：n1=');isb=input('请输入平衡母线节点号：isb=');pr=input('请输入误差精度：pr=');B1=input('请输入由支路参数形成的矩阵：B1=');B2=input('请输入各节点参数形成的矩阵：B2=');X=input('请输入由节点参数形成的矩阵：X=');Y=zeros(n);e=zeros(1,n);f=zeros(1,n);V=seros(1,n);O=zeros(1,n);S1=zeros(n1);f
2、ori=1:nifX(i,2)~=0;p=X(i,1);Y(p,p)=1./X(i,2);endendfori=1:n1ifB1(i,6)==0p=B1(i,1);q=B1(i,2);elsep=B1(i,2);q=B1(i,1);endY(p,q)=Y(p,q)-1./(B1(i,3)*B1(i,5);Y(p,q)=Y(p,q);Y(p,q)=Y(q,q)+1./(B1(i,3)*B1(i,5)^2)+B1(i,4)./2;Y(p,p)=Y(p,p)+1./B1(i,3)+B1(i,4)./2;end%求导纳矩阵G=real(Y);B=imag(Y);fori=1:ne(i)=real
3、(B2(i,3));f(i)=imag(B2(i,3));V(i)=B2(i,4);endfori=1:nS(i)=B2(i,1)-B2(i,2);B(i,i)=B(i,i)+B2(i,5);endP=rea(S);Q=imag(S);ICT1=0;IT2=1;NO=2*n;N=NO+1;a=0;whileIT2~=0IT2=0;a=a+1;fori=1:n;ifi~=isbC(i)=0;D(i)=0;forj1=1:nC(i)=C(i)+G(i,j1)*e(j1)-B(i,j1)*f(j1);D(i)=D(i)+G(i,j1)*f(j1)+B(i,j1)*e(j1);endP1=C(i
4、)*e(i)+f(i)*D(i);Q1=f(i)*C(i)-D(i)*e(i);%求'P,Q'V2=e(i)^2+f(i)^2;ifB2(i,6)~=3DP=P(i)-P1;DQ=Q(i)-Q1;forj1=1:nifj1~=isb&j1~=iX1=-G(i,j1)*e(i)-B(i,j1)*f(i);X2=B(i,j1)*e(i)-G(i,j1)*f(i);X3=X2;X4=-X1;p=2*i-1;q=2*j1-1;J(p,q)=X3;J(p,N)=DQ;m=p+1;J(m,q)=X1;J(m,N)=DP;q=q+1;J(p,q)=X4;J(m,q)=X2;endendelseDP=P
5、(i)-P1;DV=V(i)~2-V2;forj1=1:nifj1~=isb&j1~=iX1=-G(i,j1)*e(i)-B(i,j1)*f(i);X2=B(i,j1)*e(i)-G(i,j1)*f(i);X5=0;X6=0;p=2*i-1;q=2*j1-1;J(p,q)=X5;J(p,N)=DV;m=p+1;J(m,q)=X1;J(m,N)=DP;q=q+1;J(p,q)=X6;J(m,q)=X2;elseifj1==i&j1~=isbX1=-C(i)-G(i,i)*e(i)-B(i,i)*f(i);X2=-D(i)+B(i,i)*e(i)-G(i,i)*f(i);X5=-2*e(i)
6、;X6=-2*f(i);p=2*i-1;q=2*j1-1;J(p,q)=X5;J(p,N)=DV;m=p+1;J(m,q)=X1;J(m,N)=DP;q=q+1;J(p,q)=X6;J(m,q)=X2;endendendendend%求雅可比矩阵fork=3:N0k1=k+1;N1=N;fork2=k1:N1J(k,k2)=J(k,k2)./J(k,k);endJ(k,k)=1;ifk~=3k4=k-1;fork3=3:k4fork2=k1:N1J(k3,k2)=J(k3,k2)-J(k3,k)*J(k,k2);endJ(k3,k)=0;endendfork3=k1:N0fork2=k1
7、:N1J(k3,k2)=J(k3,k2)-J(k3,k)*J(k,k2);endJ(k3,k)=0;endendendfork=3:2:N0-1L=(k+1)./2;e(L)=e(L)-J(k,N);k1=k+1;f(L)=f(L)-J(k1,N);endfork=3:N0DET=abs(J(k,N));ifDET>=prIT2=IT2+1endendICT2(a)=IT2ICT1=ICT1+1;fork=1:ndy(k)=sqrt
