前推回代法計算流程

1、前推回代法計算流程要看懂前推回代法計算程序，報告敘述計算原理及計算流程。繪制計算流程框圖。確定前推回代支路次序(廣度優(yōu)先，或深度優(yōu)先)，編寫前推回代計算輸入文件。進行潮流計算。下列為節(jié)點配電網(wǎng)結(jié)構(gòu)圖及系統(tǒng)支路參數(shù)和系統(tǒng)負荷參數(shù)表。1oOO0O662aoooO1031112o13圖1-2節(jié)點配電網(wǎng)結(jié)構(gòu)圖表1系統(tǒng)支路參數(shù)支路R(Q)X(Q.)B/2(Tk)(S)123.3673.6850.0232.3562.5410.0341.1451.280.0454.5245.040.0260.8561.140.0672.7452.9650.0283.7434.2510.0892.2372.7560.0310

2、4.144.6960.03111.3281.7630.011122.4362.8660.04133.5213.9660.0表2系統(tǒng)負荷參數(shù)節(jié)點編號節(jié)點類型節(jié)點初始電壓(kV)Pi(MVA)Qi(MVA)1根節(jié)點10.4002中間節(jié)點10.00.03420.03013中間節(jié)點10.00.06930.06424中間節(jié)點10.00.08450.07635葉節(jié)點10.00.02950.02616中間節(jié)點10.00.04740.04097葉節(jié)點10.00.11760.09578中間節(jié)點10.00.09460.08579葉節(jié)點10.00.09160.085910葉節(jié)點10.00.02710.022911中

3、間節(jié)點10.00.06960.064312葉節(jié)點10.00.06760.057913葉節(jié)點10.00.02980.0242主程序清單:PQ,FT,RX=case114();%調(diào)用數(shù)據(jù)文件NN=size(PQ,1);%節(jié)點數(shù)NB=size(FT,1);%支路數(shù)數(shù)V=PQ(：,1)；%V初始電壓相量maxd=1k=1whilemaxd>0.0001PQ2=PQ;%每一次迭代各節(jié)點的注入有功和無功相同PL=0.0;fori=1:NBkf=FT(i,1);%前推始節(jié)點號kt=FT(i,2);%前推終節(jié)點號PQ1(i,1)=PQ2(kf,2)+RX(i,1)*x;PQ1(i,2)=PQ2(kf,3

4、)+RX(i,2)*x;PQ2(kt,2)= PQ2(kt,2)+PQ1(i,1);PQ2(kt,3)= PQ2(kt,3)+PQ1(i,2);x=(PQ2(kf,2)A2+PQ2(kf,3)A2)/V(kf)/V(kf);%計算沿線電流平方A%計算支路首端有功/MWRX(i,1)R%計算沿支路的無功損耗/MvarRX(i,2)X%用PQ1去修正支路末端節(jié)點的有功P單位MW%用PQ1去修正支路末端節(jié)點的有功Q單位Mvar3PL=PL+RX(i,1)*x;endangle(1)=0.0;fori=NB:-1:1kf=FT(i,2);%回代始節(jié)點號kt=FT(i,1);%回代終節(jié)點號dv1=(PQ

5、1(i,1)*RX(i,1)+PQ1(i,2)*RX(i,2)/V(kf);dv2=(PQ1(i,1)*RX(i,2)-PQ1(i,2)*RX(i,1)/V(kf);V2(kt尸sqrt(V(kf)-dv1F2+dv2A2);angle(kt尸angle(kf)+atand(dv2/(V(kf)-dv1);endmaxd=abs(V2(2)-V(2);V2(1)=V(1);fori=3:1:NNifabs(V2(i)-V(i)>maxd;maxd=abs(V2(i)-V(i);endendmaxdk=k+1PQ1V=V2anglePLendclear%計算支路電壓損耗的縱分量dv1%計算

6、支路電壓損耗的橫分量dv2%計算支路末端電壓/kV%計算支路%潮流分布即支路首端潮流%節(jié)點電壓模計算結(jié)果MVAkV%節(jié)點電壓角度計算結(jié)果單位度%網(wǎng)損單位MW輸入文件清單:functionPQ,FT,RX=case114()PQ=%節(jié)點電壓有功無功10.4 0 0510.00.03420.03010.07630.02610.04090.09570.08570.085910.00.069310.00.06420.084510.00.029510.00.047410.00.117610.00.094610.00.091610.00.027110.00.069610.00.067610.00.0229

7、0.0298;0.0643FT=%首端末端50.05790.02424134431031211113766298823221;RX=%RX4.5245.043.5213.9661.1451.284.144.6962.4362.8661.3281.7632.7452.9650.8561.142.2372.7563.7434.2512.3562.5413.3673.685;計算過程maxd=maxd=0.1780k=2PQ1=0.02960.02620.02990.02430.14430.12720.02720.02300.06780.05810.13780.12300.11820.09640.1

8、6600.13780.09200.08630.18900.17480.38470.34390.80990.7260V=Columns1through89.939010.40009.88079.82209.96729.97349.97019.8550Columns9through139.95569.97809.96009.96689.9799angle=Columns1through800.30110.39860.42110.43870.34210.39160.3878Columns 9 through 13#0.4257 0.4204 0.4486 0.4791 0.4434PL=0.0471

9、maxd=0.1787PQ1=0.02960.02620.02990.02430.14430.12720.02720.02300.06780.05810.13780.12300.11820.09640.16600.13780.09200.08630.18900.17490.38490.34420.81120.7274V=Columns1through810.40009.87989.70049.78869.94059.85049.90899.7338Columns9through139.81009.79969.78139.92679.9470angle=Columns1through800.30

10、110.40110.42440.44210.34310.39290.3899PL=0.0484maxd=0.1793PQ1=0.02960.02620.02990.02430.14440.12720.02720.02300.06780.05810.13790.12310.11820.09640.16610.13780.09200.08640.18910.17490.38510.34440.81150.7277Columns1through810.40009.87969.69949.66669.76149.84959.78849.7329Columns9through139.68839.6777

11、9.65919.74749.7680angle=Columns1through800.30110.40110.42500.44330.34310.39420.3899Columns9through130.42660.42090.44980.48140.4447PL=0.048711maxd=0.1226PQ1=0.02960.02620.02990.02430.14440.12720.02720.0230#0.06780.05810.13790.12310.11830.09640.16610.13790.09200.08640.18910.17500.38520.34440.81150.727

12、8V=Columns1through810.40009.87959.69919.66569.63919.84939.78759.7326Columns9through139.68739.67679.65819.62489.6457angle=Columns1through800.30110.40110.42500.44380.34310.39420.3899Columns9through130.42660.42090.44980.48220.4452PL=0.0487maxd=0.0010k=PQ1=0.02960.02620.02990.02430.14440.12730.02720.023

13、00.06780.05810.13790.12310.11830.09640.16610.13790.09200.08640.18910.17500.38520.34450.81160.7278V=Columns1through810.40009.87959.69919.66539.63819.84929.78739.7326Columns9through139.68709.67649.65799.62389.6447angle=Columns1through800.30110.40110.42500.44380.34310.39420.3899Columns9through130.42660

14、.42090.44980.48230.4452PL=0.0488maxd=2.6021e-004PQ1 =#0.02960.02620.02990.02430.14440.12730.02720.02300.06780.05810.13790.12310.11830.09640.16610.13790.09200.08640.18910.17500.38520.34450.81160.7278V=Columns1through810.40009.87959.69919.66529.63789.84929.78729.7326Columns9through139.68709.67649.6578

15、9.62359.6445angle=Columns1through800.30110.40110.42500.44380.34310.39420.3899Columns9through1315V =19PL=0.0488maxd=6.1046e-005PQ1=0.02960.02620.02990.02430.14440.12730.02720.02300.06780.05810.13790.12310.11830.09640.16610.13790.09200.08640.18910.17500.38520.34450.81160.7278V=Columns1through89.787210

16、.40009.87959.69919.66529.63779.84929.7326Columns9through139.68709.67649.65789.62359.6444angle=Columns1through800.30110.40110.42500.44380.34310.39420.3899Columns9through130.42660.42090.44980.48230.4452PL=0.0488計算結(jié)果清單:maxd=1k=1maxd=0.1780k=2maxd=0.1787k=3maxd=0.1793k=4maxd=0.1226k=5maxd=0.0010k=6maxd=2.6021e-04k=7maxd=6.1046e-05k=8PQ1=0.02960.02620.02990.02430.14440.12730.02720.02300.06780.05810.13790.12310.11830.09640.16610.13790.09200.08640.18910.175