前推回代法计算流程

1、1011前推回代法计算流程要看僮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 0o9O12o13图1-2节点配电网结构图 表1系统支路参数支路R(Q)X (0.)B/2 (TK) (S)广22飞344526672飞旷9310311iri2413表2系统负荷参数节点编号节点类型节点初始电压Pi (MVA)Q. (MVA)(kV)1根节点002中间节点3中间节点4中间节点5叶节点6中间节点7叶节点8中间节点9叶节点10叶节点11中间节

2、点12叶节点13叶节点主程序清单:PQ, FT, RX=case114() ;%调用数据文件NN=s i ze (PQ, 1);NB=s i ze (FT, 1);V=PQ(:,1); maxd=1%节点数%支路数数%v初始电压相量k=1while maxdPQ2=PQ;PL=;%每一次迭代各节点的注入有功和无功相同for i=1:NBkf=FT(i,1); kt 二 FT(i,2);%前推始节点号%前推终节点号x= (PQ2 (kf, 2厂2+PQ2 (kf, 3厂2) /V (kf) /V (kf);%计算沿线电流平方 APQ1(i,1) =PQ2 (kf, 2)+RX(i,1)*x;%计

3、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厂Xfunction PQ, FT, RX=case114()endend maxd k 二 k+1PQ1V=V2ang I ePLendc I earPQ2(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 二 PL+RX (i, 1)*x;endangle(1) = ;for

4、i二NB:T:1kf=FT(i,2);%回代始节点号kt=FT(i,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) =sqrt (V (kf)-dv1) /2+dv22) ;%计算支路末端电压/kVang I e (kt) =ang I e (kf) +atand (dv2/ (V (kf) -dv1) ;%计算支路end maxd=abs

5、(V2(2)-V(2)；V2(1)=V(1);for i=3:1:NNif abs(V2(i)-V(i)maxd;maxd二abs(V2(i) -V(i);%潮流分布即支路首端潮流MVA%节点电压模计算结果kV%节点电压角度计算结果单位度%网损单位MW输入文件清单:PQ=%节点电压有功 无功1；FT=%首端末端5134101211769832;RX=% R4433113628221计算过程maxd =1k =1maxd =k =2PQ1 =V =Co Iumns 1 through 8Co Iumns 9 through 133angIe =Co Iumns 1 through 80Co Iu

6、mns 9 through 13maxd =PQ1 二4PQ1Co Iumns 1 through 8Co Iumns 9 through 13 angIe =Co Iumns 1 through 80Co Iumns 9 through 13maxd =Co Iumns 1 through 85PQ1Co Iumns 9 through 13 angIe =Co Iumns 1 through 80Co Iumns 9 through 13maxd =Co Iumns 1 through 8Co Iumns 9 through 13 angle =Co Iumns 1 through 80C

7、o Iumns 9 through 13maxd =PQ1 =Co Iumns 1 through 8Co Iumns 9 through 13 angle =Co Iumns 1 through 80Co Iumns 9 through 13maxd = k =7PQ1 =V =Co Iumns 1 through 8Co Iumns 9 through 13 angle =Co Iumns 1 through 80Co Iumns 9 through 13maxd =k =8PQ1 =V =Co Iumns 1 through 8Co Iumns 9 through 13angle =Co Iumns 1 through 80Co Iumns 9 through 13计算结果清单:maxd = 1k = 1 maxd =k = 2 maxd =k = 3 maxd =k = 4 maxd =k =