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1、电力系统牛顿拉夫逊计算机算法潮流计算n=input('n=5');nl=input('nl=5');isb=input('isb=1');pr=input('pr=0.00001');B1=input('B1=[120.03i01.050;230.08+0.03i0.5i10;240.1+0.35i010;340.04+0.25i0.5i10;350.015i01.051]');B2=input('B2=[001.051.0501;03.7+1.3i1002;02+1i1002;01.6+0.8i1002;501.051.0503]');X=
2、input('X=[10;20;30;40;50]');Y=zeros(n);e=zeros(1,n);f=zeros(1,n);V=zeros(1,n);O=zeros(1,n);S1=zeros(nl);fori=1:nifX(i,2)~=0;p=X(i,1);Y(p,p)=1./X(i,2);endendfori=1:nlifB1(i,1);q=B1(i=2);elsep=B1(i,2);q=B1(i,1);endY(q,p)=Y(p,q)-1./B1(i,3)*B1(i,5);Y(p,q)=Y(p,q);Y(p,q)=Y(q,q)+1
3、./(B1(i,3)*Bi(i,5)~2)+B1(i,4)./2;Y(p,q)=Y(p,p)+1./Bi(i,3)+B1(i,4).2;end%求出导纳矩阵G=real(Y);B=imag(Y);fori=1:ne(i)=real(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=real(S);Q=imag(S);ICT1=0;IT2=1;NO=2*n;N=NO+1;a=0;whileIT2~
4、=0IT2=0;a=a+1;fori=1:nifi~=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,ji)*f(j1)+B(i,j1)*e(j1);endP1=C(i)*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(
5、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,p)=X1;J(m,N)=DP;q=q+1;J(p,q)=X4;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);X3=D(i)+B(i,i)*e(i)-G(i,i)*f(i);X4=-C(i)+G
6、(i,i)*e(i)+B(i,i)*f(i);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(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)=D
7、V;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);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fo
8、rk=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;for
