[其它]A load flow method using line-to-line voltages for ungrounded distribution power systems

Abstract--Some load flow methods in distribution power 'uSn}hm  
systems, such as Backward-Forward Sweep method, Zbus O`IQ(,yef  
method, and Loop Impedance Method, advocate phase-to-ground t&C1Oo}=3  
voltage component. But in ungrounded distribution networks, the _^Ubs>d=*  
ground reference is lost and the phase-to-ground voltage is /|6N*>l)y  
undefined, so the solution can’t be unique. Also in these dd%6t  
ungrounded systems, admittance submatrices of transformers ;#W2|'HD  
become singularity. The traditional Backward-Forward Sweep -">;-3,K  
method can’t handle these problems. This paper advocates lineto- vxBgGl  
line voltage component, avoiding the singularity caused by JzQ_{J`k  
admittance submatrices of transformers in ungrounded [.7d<oY  
distribution power systems. Models of loads, transmission lines, @e.C"@G  
transformers and induction motors are modified using this r= `Jn6@  
component. We note that these models can be easily incorporated oGnSPI5KGC  
into an implicit Backward-Forward Sweep method, and it can l`lk-nb  
easily deal with load flow calculation in ungrounded distribution \
h/H#jZJ  
systems. The load flow method based on line-to-line voltage = SMXDaH  
component models can also decrease the calculation, and it ^,TO#%$iE  
coincides with the real circumstance in .. ]nn
98y+  
SaO}e  

未注册仅能浏览部分内容，查看全部内容及附件请先 登录 或 注册