電力系統(tǒng)分析理論課本習(xí)題matlab做-資料下載頁
2025-03-25 06:07本頁面
【正文】 St2=63Vs2=L1=120Xl=X0=5*XlVb=230Sb=100Xg11=Xd1*Sb/(Sg1/cos1)Xt11=Vs1*Sb/(100*St1)Xl11=*L1*Xl*Sb/Vb^2Xt21=Vs2*Sb/(100*St2)Xg21=Xd2*Sb/(Sg2/cos2)Xg12=X12*Sb/(Sg1/cos1)Xt12=Vs1*Sb/(100*St1)Xl12=*L1*Xl*Sb/Vb^2Xt22=Vs2*Sb/(100*St2)Xg22=Xt22*Sb/(Sg2/cos2)Xl0=5*Xl11Xt10=Vs1*Sb/(100*St1)Xt20=Vs2*Sb/(100*St2)%（1）制定各序等值電路X1=(Xg11+Xt11+Xl11)*(Xt21+Xg21)/((Xg11+Xt11+Xl11)+(Xt21+Xg21))X2=(Xg12+Xt12+Xl12)*(Xt22+Xg22)/((Xg12+Xt12+Xl12)+(Xt22+Xg22))X0=(Xl0+Xt10)*Xt20/((Xl0+Xt10)+Xt20)%（2）計(jì)算各種不對(duì)稱短路時(shí)的短路電流Xd1=X2+X0 %單相接地短路m1=3Ed=1Ia11=Ed/(X1+Xd1)Ib=Sb/(sqrt(3)*Vb) %基準(zhǔn)電流If1=m1*Ia11*IbXd2=X2 %倆相短路m2=sqrt(3)Ia12=Ed/(X1+Xd2)If2=m2*Ia12*IbXd11=X2*X0/(X2+X0) %；倆相短路接地m11=sqrt(3)*sqrt(1(X2*X0/(X2+X0)^2))Ia111=Ed/(X1+Xd11)If11=m11*Ia111*IbSg1 =100cos1 =Xd1 =X12 =Sg2 = 50cos2 = Xd2 =Xx22 =St1 =120Vs1 =St2 =63Vs2 =L1 =120Xl =X0 =Vb =230Sb =100Xg11 =Xt11 =Xl11 =Xt21 =Xg21 =Xg12 =Xt12 =Xl12 =Xt22 =Xg22 =Xl0 =Xt10 =Xt20 =X1 =X2 =X0 =Xd1 =m1 =3Ed =1Ia11 =Ib =If1 =Xd2 =m2 =Ia12 =If2 =Xd11 =m11 =Ia111 =If11 = %例題83V1=230a=+1i*((sqrt(3))/2)A=a*aX1=X2=X0=Ia1=Va1=i*(1X1*Ia1)Va2=1i*X2*Ia1Va0=1i*X0*Ia1a=+1i*((sqrt(3))/2)A=*((sqrt(3))/2)Vb1=A*Va1+a*Va2+Va0Vb11=abs(Vb1)Vc1=a*Va1+A*Va2+Va0%b、c相電壓有名值為Vb=Vb11*V1/sqrt(3)Vc=VbV1 =230a = + A = X1 =X2 =X0 =Ia1 =Va1 =0 + Va2 =0 Va0 =0 Vb1 = Vb11 =Vc1 = Vb =Vc = %例題84X1w=X2w=X0w=If1=Xg1=Xg2=Xt1=Xl1=E1=j*1 %相電動(dòng)勢(shì)Vn=Sb=100a1=+j*sqrt(3)/2 a2=*sqrt(3)/2 a0=1If2=(X0w/(X2w+X0w))*If1 %兩相短路接地Vf1=j*(X2w*X0w/(X2w+X0w))*If1 %短路點(diǎn)各序電壓Vf2=Vf1X1=Xg1+Xt1+Xl1 %正序電抗X2=Xg2+Xt1+Xl1 %負(fù)序電抗Il1=(E1Vf1)/(j*X1) %從輸電線路向f的電流Il2=X2w*If2/X2Ita1=Il1*[(sqrt(3)/2)+j*] %變壓器三角形側(cè)的正序電流Ita2=Il2*[(sqrt(3)/2)j*] %變壓器三角形側(cè)的負(fù)序電壓%變壓器T1三角形測的正序電壓為Vta1=[Vf1+j*Il1*(Xt1+Xl1)]*[(sqrt(3)/2)+j*]%變壓器T1三角形測的負(fù)序電壓為Vta2=[Vf1+j*Il2*(Xt1+Xl1)]*[(sqrt(3)/2)j*]%變壓器三角形側(cè)的各相電壓和電流的標(biāo)幺值為Vta=Vta1+Vta2Vtb=a2*Vta1+a1*Vta2Vtc=a1*Vta1+a2*Vta2Ita=Ita1+Ita2Itb=a2*Ita1+a1*Ita2Itc=a1*Ita1+a2*Ita2Vpb=Vn/sqrt(3) %相電壓的基準(zhǔn)值%變壓器三角形側(cè)各相電壓和電流的有名值分別為Ib=Sb/(sqrt(3)*Vn)Vta=abs(Vta)*VpbVtb=abs(Vtb)*VpbVtc=abs(Vtc)*VpbIta=abs(Ita)*IbItb=abs(Itb)*IbItc=abs(Itc)*Ib X1w =X2w =X0w =If1 =Xg1 =Xg2 =Xt1 =Xl1 =E1 =0 + Vn =Sb =100a1 = + a2 = a0 =1If2 =Vf1 =0 + Vf2 =0 + X1 =X2 =Il1 =Il2 =Ita1 = + Ita2 = + Vta1 = + Vta2 = + Vta = + Vtb =Vtc = Ita = + Itb =0 Itc = + Vpb =Ib =Vta =Vtb =Vtc =Ita =Itb =Itc =24 / 2
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