三相短路短路电流计算matlab程序文档

电力系统三相短路计算main.macleartim%打开文件[dfile,pathname]=uigetfile(ifpathname==0'*.m','SelectDataFile');error('youmustselectavaliddatafile')elselfile=length(dfile);eval(dfile(1:lfile-2));end%定义输出文件output_file=fopen('output.dat','w');%开始计时tic;

%求解节点导纳矩阵，其中Ymatrix1是考虑了变比，且支路未近似的导纳矩阵；Ymatrix2是近似变比为1，但是支路未近似计算的节点导纳矩阵；Ymatrix3是近似变比为1，采取近似支路参数1的导纳矩阵；Ymatrix4是近似变比为1，采取近似支路参数2的导纳矩阵。Y=Ymatrix2(bus,line);%对故障点进行导纳修正fixY=FixY(Y,bus,fault);%求注入电流Iinj=Inode(bus,calcSettings);%得到故障支路与其他支路电流Bcurrent=Ibranch(line,U,fault,Y);%如果发生支路三相短路，那么对应该支路的电流修正为-999999-j999999Ib=ReviseBcurrent(fault,Bcurrent);%结束计时tim=toc;

fprintf('

程序运行结果');fprintf('

计算完成，共用时%4.4fs,相关结果已保存在output.dat

',tim);%输出结果fprintf_result(output_file,Ib);fprintf_result1(Ib);FixY.mbfunctionfixY=FixY(Y,bus,fault)%对形成的导纳矩阵进行故障点的修正[nb,mb]=size(bus);[nf,mf]=size(fault);fixY=Y;%对发电机节点导纳修正fork=1:nbbusType=bus(k,7);if(busType==1)

fixY(bus(k,1),bus(k,1))=fixY(bus(k,1),bus(k,1))+1/1i/bus(k,8);endend%对节点短路和支路短路的导纳矩阵进行修正fork=1:nfnodeI=fault(k,1);nodeJ=fault(k,2);dis=fault(k,3);if(nodeI==0)fixY(nodeJ,nodeJ)=999999+1i*999999;continue;endif(nodeJ==0)fixY(nodeI,nodeI)=999999+1i*999999;continue;

endif(dis==0)&&(nodeI*nodeJ~=0)fixY(nodeI,nodeI)=999999+1i*999999;continue;endif(dis==1)&&(nodeI*nodeJ~=0)fixY(nodeJ,nodeJ)=999999+1i*999999;continue;endif(dis~=1)&&(dis~=0)&&(nodeI*nodeJ~=0)fixY(nodeI,nodeI)=fixY(nodeI,nodeI)-fixY(nodeI,nodeJ)/dis;fixY(nodeJ,nodeJ)=fixY(nodeJ,nodeJ)-fixY(nodeI,nodeJ)/(1-dis);fixY(nodeI,nodeJ)=0;fixY(nodeJ,nodeI)=0;end

endendfprintf_result.mcfunction[output_args]=fprintf_result(output_file,Ib)%将得到的短路电流输入到输出文件中[n,m]=size(Ib);fprintf(output_file,'No.No.vectorofIvalueofI

');fork=1:nI=Ib(k,1);J=Ib(k,2);I01=real(Ib(k,3));I02=imag(Ib(k,3));I1=Ib(k,4);

if(I02>=0)fprintf(output_file,'%3d%3d%10.6f+j%10.6f%10.6f',I,J,I01,I02,I1);endif(I02<0)I02=abs(I02);fprintf(output_file,'%3d%3d%10.6f-j%10.6f%10.6f',I,J,I01,I02,I1);endfprintf(output_file,'

');endendfprintf_result1.mdfunction[output_args]=fprintf_result1(Ib)%UNTITLED???ú′?′|ê?è?oˉêy??òa

[n,m]=size(Ib);fprintf('No.No.vectorofIvalueofI

');fork=1:nI=Ib(k,1);J=Ib(k,2);I01=real(Ib(k,3));I02=imag(Ib(k,3));I1=Ib(k,4);if(I02>=0)fprintf('%3d%3d%10.6f+j%10.6f%10.6f',I,J,I01,I02,I1);endif(I02<0)I02=abs(I02);fprintf('%3d%3d%10.6f-j%10.6f%10.6f',I,J,I01,I02,I1);end

fprintf('

');endendIbranch.mefunctionBcurrent=Ibranch(line,U,fault,Y)%计算短路电流%记录短路故障参数，如短路节点，如为支路短路，记录距离节点的距离%此段计算采用的支路参数未近似，如果计算近似的时候需要修改[nl,ml]=size(line);Bcurrent=zeros(nl+1,4);faultI=fault(1,1);faultJ=fault(1,2);dis=fault(1,3);faultNode=0;if(faultI==0)

faultNode=faultJ;endif(faultJ==0)faultNode=faultI;endif(dis==1)&&(faultI*faultJ~=0)faultNode=faultJ;endif(dis==0)&&(faultI*faultJ~=0)faultNode=faultI;endif(faultNode~=0)Bcurrent(nl+1,1)=faultNode;Bcurrent(nl+1,2)=faultNode;Iij=0;

Iij1=0;end%计算非故障支路的短路电流fork=1:nli=line(k,1);j=line(k,2);Ui=U(i);ifj~=0Uj=U(j);elseUj=0;endifline(k,2)==0Ym=line(k,5)+1i*line(k,6);Iij=Ui*Ym;

Iij1=abs(Iij);endifline(k,2)~=0Zt=line(k,3)+1i*line(k,4);Yt=1/Zt;Ym=line(k,5)+1i*line(k,6);Iij=(Ui-Uj)*Yt+Ui*Ym;Iij1=abs(Iij);endBcurrent(k,1)=i;Bcurrent(k,2)=j;Bcurrent(k,3)=Iij;Bcurrent(k,4)=Iij1;end%如果为节点短路，修正短路点的电流大小

if(faultNode~=0)Bcurrent(nl+1,1)=faultNode;Bcurrent(nl+1,2)=faultNode;Ifault=0;branchCurrent=0;fork=1:nlI=line(k,1);J=line(k,2);if(I*J==0)continue;endbranchCurrent=(U(I)-U(J))/(line(k,3)+1i*line(k,4));if(I==faultNode)Ifault=Ifault-branchCurrent;elseif(J==faultNode)

Ifault=Ifault+branchCurrent;endendendBcurrent(nl+1,3)=Ifault;Bcurrent(nl+1,4)=abs(Bcurrent(nl+1,3));end%如果为支路短路，修正短路支路的短路电流大小if(dis~=0)&&(dis~=1)&&(faultI*faultJ~=0)Bcurrent(nl+1,1)=faultI;Bcurrent(nl+1,2)=faultJ;Bcurrent(nl+1,3)=U(faultI)*Y(faultI,faultJ)/dis+U(faultJ)*Y(faultI,faultJ)/(1-dis);Bcurrent(nl+1,4)=abs(Bcurrent(nl+1,3));endend

Inode.mffunctionIinj=Inode(bus,calcSettings)%计算节点注入电流[nb,mb]=size(bus);Iinj=zeros(nb,1);fork=1:nbbusType=bus(k,7);if(calcSettings(1)==1)v=1;elsev=bus(k,2);end%对发电机节点电流进行修正if(busType==1)Iinj(bus(k,1),1)=Iinj(bus(k,1),1)+v/1i/bus(k,8);

endendendReviseBcurrent.mgfunctionIb=ReviseBcurrent(fault,Bcurrent)%如果发生支路短路，对原来的计算电流进行修正，使该支路短路电流输出为-999999-j999999clearfaultIfaultJdis[nt,mt]=size(Bcurrent);Ib=zeros(nt,mt);faultI=fault(1,1);faultJ=fault(1,2);dis=fault(1,3);fork=1:nt-1i=Bcurrent(k,1);

j=Bcurrent(k,2);Ib(k,:)=Bcurrent(k,:);if(faultI*faultJ~=0)&&(dis~=1)&&(dis~=0)&&(i==faultI)&&(j==faultJ)Ib(k,1)=i;Ib(k,2)=j;Ib(k,3)=-999999-1i*999999;Ib(k,4)=-999999;endif(faultI*faultJ~=0)&&(dis~=1)&&(dis~=0)&&(i==faultJ)&&(j==faultI)Ib(k,1)=i;Ib(k,2)=j;Ib(k,3)=-999999-1i*999999;Ib(k,4)=-999999;end

Ib(nt,:)=Bcurrent(nt,:);endYmatrix1.mhfunctionY=Ymatrix1(bus,line)%考虑变压器，并且支路参数不近似的节点导纳矩阵[nb,mb]=size(bus);[nl,ml]=size(line);Y=zeros(nb,nb);fork=1:nlI=line(k,1);J=line(k,2);Zt=line(k,3)+1i*line(k,4);Yt=1/Zt;Ym=line(k,5)+1i*line(k,6);K=line(k,7);

if(K==0)&&(J~=0)Y(I,I)=Y(I,I)+Yt+Ym;Y(J,J)=Y(J,J)+Yt+Ym;Y(I,J)=Y(I,J)-Yt;Y(J,I)=Y(I,J);endif(K==0)&&(J==0)Y(I,I)=Y(I,I)+Ym;endifK>0Y(I,I)=Y(I,I)+Yt+Ym;Y(J,J)=Y(J,J)+Yt/(K*K);Y(I,J)=Y(I,J)-Yt/K;Y(J,I)=Y(I,J);end

ifK<0Y(I,I)=Y(I,I)+Yt+Ym;Y(J,J)=Y(J,J)+K*K*Yt;Y(I,J)=Y(I,J)+K*Yt;Y(J,I)=Y(I,J);endendendYmatrix2.mifunctionY=Ymatrix2(bus,line)%考虑变压器变比近似为1，支路参数不等效[nb,mb]=size(bus);[nl,ml]=size(line);Y=zeros(nb,nb);fork=1:nl

I=line(k,1);J=line(k,2);Zt=line(k,3)+1i*line(k,4);Yt=1/Zt;Ym=line(k,5)+1i*line(k,6);ifJ~=0Y(I,I)=Y(I,I)+Yt+Ym;Y(J,J)=Y(J,J)+Yt+Ym;Y(I,J)=Y(I,J)-Yt;Y(J,I)=Y(I,J);endifJ==0Y(I,I)=Y(I,I)+Ym;endend

endYmatrix3.mjf