电力系统分析公式

1、电力系统分析常用公式第二章 电力网各元件的等值电路和参数计算r/ sr铜 =18.8mm2 /kmr铝 =31.5mm 2 /kmDeq=3 D12D23D31水平排列 Deq=3 DDD1.26DDS 0.8rg0分裂根数为2时 D=D dsbS分裂根数为3时D=3D d2sbS分裂根数为4时 Dsb =1.094 DSd3DeqDeq/km单 x0 =0.0628ln=01445lg.DsDs多 x0 =0.0628ln eq =0.1445lgDeq /kmDDsbDsb二分裂req =rd三分裂req = 3rd 2四分裂req = 1. 049rd 3b0 = 7.58* 10 -6

2、s/kmD eqlgreqZ=(r+jx )*lY=(g 0 +jb0 )*l00Z' =(kr r0 +jk x x0)*lY'= j kbb0 * lkr =1-1 x0b0l23kx =1-1 (x0 b0 -r0 2 b0 )l 26x0kb =1+ 1 x0b0l 212I 0 %变压器参数：Q0 SN 100RTPSVN 23SN2*10XTV% V23S*N*10100SNGTP0*10-3V1N2K TVNV2NBTI 0% * SN2 *10-3100VNVV2SZBBBB3I BSBI B3VBI3VB IVN2SBI *I BSBXBX* SN* VB2X

3、 G *X G*VG2SB*VB2SGXTVS%* VN2 * SB100SV2NBX RVR%* VR* SB1003I RVB2X L *X L *SBVB2VT (N1) /VT( N2)KT *VB(1) /VB (2)1第三章同步发电机的基本方程i =2i cos +i cos(-120)+icos(+120)d3abciq= 2iasin +ibsin( -120)+icsin( +120) 3i0 =i a *i b *i cV Vd VqII dI qV EqjX q I qjX d I dEqj ( X dX q ) I djX q IEQEqj ( X dX q )I dV

4、EQjX q I第六章短路电流周期分量的近似计算I P*1 X ffIP=IP*I BI BX ffSSB /Xff * S* fB IP*SB第九章电力系统的负荷248760WdpdtWpdt00PavWd12424pdt24 0PPm i nkmavPm a xPmaxTmaxW18760PmaxPmaxpdt0第十章电力传输的基本概念VPRQXVP XQ RVV电压偏移（ %） =VVN *100VN无功损耗QB1BV22变压器的励磁损耗S0 (GTjBT )V 2输电效率 = P1 *100%P2V1(V2V2) 2V22SP2Q2 (RjX )V 22S1V12 D( BD)VV12

5、( B)11BBV 2 AVV2S21( BA )1( B)22BB第十一章电力系统的潮流计算Vieijf iY GijjBijnnPiei(Gij ejBij f j ) fi(Gij f jBij ej )j1j1nnQifi(Gij ejBij Fj ) ei(Gij f jBij ej )j1j1isnnPi(Gij ejBij f j ) fi(Gij f jBij ej )P eij 1j1nnQiQisfi(GijejBij f j ) ei(Gij fjBij ej )j1j1i1,2,3 , mWJ V2i j时Pi =-Qi =-( Ge+B f)ejijjij jf jP

6、i = -Qi=B e G-fif jejijiijVi2=Vi2=0ejf j时Pni=-(G eB f)-Ge-B fi=jeik 1ik kik kii iii iPin=- (G fB e )+ B e -G fif jikkikkii iiik1Qin=-(G eB fk)+G e +B fifiikkikii iiik1Qi=n(G fB e )+B e -G fkeik 1ikik kii iii iVi2=-2eVi 2= - 2fiejif j第十三章 电力系统的有功功率平衡和频率调整KDPDK D *K Df NfPDNf*PGNPf NK G1PGKG*1fNfKG*PGNPPP(K +K ) fK fD0GDGDK KG +KDPD 0 / fK G*PGN +K D*PDN- P