前推回代法计算流程

1、实用标准文档大全前推回代法计算流程要看懂前推回代法计算程序，报告叙述计算原理及计算流程。 绘制计算流程框图。确定前推回代 支路次序（广度优先，或深度优先），编写前推回代计算输入文件。进行潮流计算。下列为节点配电网结构图及系统支路参数和系统负荷参数表。1。101112135。图1-2节点配电网结构图表1系统支路参数支路R(Q)X ( .)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系统负荷参数节点编号节点类型节点初始电压(kV)Pi (MVA)Qi (MVA)1根节点10.4002中间节点10.00.03420.03013中间节点10.00.06930.06424中间节点10.00.08450.07635叶节点10.00.02950.02616中间节点10.00.04740.04097叶节点10.00.11760.09578中间节点10.00.09460.08579叶节点10.00.09160.085910叶节点10.00.02710.02291

3、1中间节点10.00.06960.064312叶节点10.00.06760.057913叶节点10.00.02980.0242主程序清单：PQ,FT,RX=case114();% 调用数据文件NN=size(PQ,1);% 节点数NB=size(FT,1);%支路数数V=PQ(:,1);%V初始电压相量maxd=1k=1while maxd>0.0001PQ2=PQ;%每一次迭代各节点的注入有功和无功相同PL=0.0;for i=1:NBkf=FT(i,1);%前推始节点号kt=FT(i,2);%前推终节点号x=(PQ2(kf,2)A2+PQ2(kf,3)A2)/V(kf)/V(kf);

4、%计算沿线电流平方 APQ1(i,1)=PQ2(kf,2)+RX(i,1)*x;%计算支路首端有功 /MW RX(i,1)RPQ1(i,2)=PQ2(kf,3)+RX(i,2)*x;%计算沿支路的无功损耗 /Mvar RX(i,2)XPQ2(kt,2)= PQ2(kt,2)+PQ1(i,1);%用PQ1去修正支路末端节点的有功 P单位MWPQ2(kt,3)= PQ2(kt,3)+PQ1(i,2);%用PQ1去修正支路末端节点的有功 Q 单位MvarPL=PL+RX(i,1)*x; end angle(1)=0.0; for i=NB:-1:1 kf=FT(i,2);%回代始节点号kt=FT(i

5、,1);%回代终节点号dv1=(PQ1(i,1)*RX(i,1)+PQ1(i,2)*RX(i,2)/V(kf);% 计算支路电压损耗的纵分量 dv1dv2=(PQ1(i,1)*RX(i,2)-PQ1(i,2)*RX(i,1)/V(kf);% 计算支路电压损耗的横分量 dv2V2(kt尸sqrt(V(kf)-dv1)A2+dv2A2);%计算支路末端电压 /kVangle(kt)=angle(kf)+atand(dv2/(V(kf)-dv1);%计算支路end maxd=abs(V2(2)-V(2); V2(1)=V(1); for i=3:1:NN if abs(V2(i)-V(i)>m

6、axd; maxd=abs(V2(i)-V(i); end end maxd k=k+1 PQ1%潮流分布 即支路首端潮流MVAV=V2%节点电压模计算结果kVangle%节点电压角度计算结果单位度PL%网损单位MWend clear输入文件清单:function PQ,FT,RX=case114()PQ=无功%范点电压有功10.40010.00.0342 0.030110.00.0693 0.064210.00.0845 0.076310.00.0295 0.026110.00.0474 0.040910.00.1176 0.095710.00.0946 0.085710.00.0916 0

7、.085910.00.0271 0.022910.00.0696 0.064310.00.0676 0.057910.00.0298 0.0242；FT=%首端末端541344310 3121111 3766298823221；RX=% R X4.524 5.043.521 3.9661.145 1.284.14 4.6962.436 2.8661.328 1.7632.745 2.9650.856 1.142.237 2.7563.743 4.2512.356 2.5413.367 3.685;计算过程maxd = maxd =0.1780PQ1 =0.0296 0.02620.0299 0

8、.02430.1443 0.12720.0272 0.02300.0678 0.05810.1378 0.12300.1182 0.09640.1660 0.13780.0920 0.08630.1890 0.17480.3847 0.34390.8099 0.7260V =Columns 1 through 810.4000 9.8807 9.8220 9.9672 9.9734 9.9701 9.9390 9.8550Columns 9 through 139.9556 9.9780 9.9600 9.9668 9.9799 angle =Columns 1 through 80 0.30

9、11 0.3986 0.4211 0.4387 0.3421 0.3916 0.3878Columns 9 through 130.4225 0.4173 0.4444 0.4747 0.4400PL =0.0471 maxd =0.1787PQ1 =0.0296 0.02620.0299 0.02430.1443 0.12720.0272 0.02300.0678 0.05810.1378 0.12300.1182 0.09640.1660 0.13780.0920 0.08630.1890 0.17490.3849 0.34420.8112 0.7274V =Columns 1 throu

10、gh 810.4000 9.8798 9.7004 9.7886 9.9405 9.8504 9.9089 9.7338Columns 9 through 139.8100 9.7996 9.7813 9.9267 9.9470angle =Columns 1 through 80 0.3011 0.4011 0.4244 0.4421 0.3431 0.3929 0.3899Columns 9 through 130.4257 0.4204 0.4486 0.4791 0.4434PL =0.0484maxd =0.1793k =4PQ1 =0.0296 0.02620.0299 0.024

11、30.1444 0.12720.0272 0.02300.0678 0.05810.1379 0.12310.1182 0.09640.1661 0.13780.0920 0.08640.1891 0.17490.3851 0.34440.8115 0.7277V =Columns 1 through 810.4000 9.8796 9.6994 9.6666 9.7614 9.8495 9.7884 9.7329Columns 9 through 139.6883 9.6777 9.6591 9.7474 9.7680angle =Columns 1 through 80 0.3011 0.

12、4011 0.4250 0.4433 0.3431 0.3942 0.3899Columns 9 through 130.4266 0.4209 0.4498 0.4814 0.4447PL =0.0487maxd =0.1226k =5PQ1 =0.0296 0.02620.0299 0.02430.1444 0.12720.0272 0.02300.0678 0.05810.1379 0.12310.1183 0.09640.1661 0.13790.0920 0.08640.1891 0.17500.3852 0.34440.8115 0.7278V =Columns 1 through

13、 810.4000 9.8795 9.6991 9.6656 9.6391 9.8493 9.7875 9.7326Columns 9 through 139.6873 9.6767 9.6581 9.6248 9.6457 angle =Columns 1 through 80 0.3011 0.4011 0.4250 0.4438 0.3431 0.3942 0.3899Columns 9 through 130.4266 0.4209 0.4498 0.4822 0.4452PL =0.0487maxd =0.0010PQ1 =0.0296 0.02620.0299 0.02430.14

14、44 0.12730.0272 0.02300.0678 0.05810.1379 0.12310.1183 0.09640.1661 0.13790.0920 0.08640.1891 0.17500.3852 0.34450.8116 0.7278V =Columns 1 through 810.4000 9.8795 9.6991 9.6653 9.6381 9.8492 9.7873 9.7326Columns 9 through 139.6870 9.6764 9.6579 9.6238 9.6447 angle =Columns 1 through 80 0.3011 0.4011

15、 0.4250 0.4438 0.3431 0.3942 0.3899Columns 9 through 130.4266 0.4209 0.4498 0.4823 0.4452PL =0.0488 maxd =2.6021e-004PQ1 =0.0296 0.02620.0299 0.02430.1444 0.12730.0272 0.02300.0678 0.05810.1379 0.12310.1183 0.09640.1661 0.13790.0920 0.08640.1891 0.17500.3852 0.34450.8116 0.7278V =Columns 1 through 8

16、9.787210.4000 9.8795 9.6991 9.6652 9.6378 9.8492 9.7326Columns 9 through 139.6870 9.6764 9.6578 9.6235 9.6445 angle =Columns 1 through 80.39420 0.3011 0.4011 0.4250 0.4438 0.3431 0.3899Columns 9 through 130.4266 0.4209 0.4498 0.4823 0.4452PL =0.0488 maxd =6.1046e-005PQ1 =0.0296 0.02620.0299 0.02430.

17、1444 0.12730.0272 0.02300.0678 0.05810.1379 0.12310.1183 0.09640.1661 0.13790.0920 0.08640.1891 0.17500.3852 0.34450.8116 0.7278Columns 1 through 810.4000 9.8795 9.6991 9.6652 9.6377 9.8492 9.78729.7326Columns 9 through 139.6870 9.6764 9.6578 9.6235 9.6444 angle =Columns 1 through 80 0.3011 0.4011 0

18、.4250 0.4438 0.3431 0.3942 0.3899Columns 9 through 130.4266 0.4209 0.4498 0.4823 0.4452PL =0.0488计算结果清单:maxd = 1k = 1maxd = 0.1780k = 2maxd = 0.1787k = 3maxd = 0.1793k = 4maxd = 0.1226k = 5maxd = 0.0010k = 6maxd = 2.6021e-04k = 7maxd = 6.1046e-05 k = 8PQ1 =0.02960.02620.02990.02430.14440.12730.02720.02300.06780.05810.13790.12310.11830.09640.1661