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

Abstract--Some load flow methods in distribution power 5N*Ux4M  
systems, such as Backward-Forward Sweep method, Zbus tl'9IGlc  
method, and Loop Impedance Method, advocate phase-to-ground "=za??
\K}  
voltage component. But in ungrounded distribution networks, the 'hv k
  
ground reference is lost and the phase-to-ground voltage is qt^T6+faaQ  
undefined, so the solution can’t be unique. Also in these X>. NFB  
ungrounded systems, admittance submatrices of transformers *@)O7vB  
become singularity. The traditional Backward-Forward Sweep jSuL5|Gui  
method can’t handle these problems. This paper advocates lineto- -s$F&\5by  
line voltage component, avoiding the singularity caused by ~JDnKo  
admittance submatrices of transformers in ungrounded 70mpSD3  
distribution power systems. Models of loads, transmission lines, B0!"A  
transformers and induction motors are modified using this g HbxgeL  
component. We note that these models can be easily incorporated H0R&2#YD  
into an implicit Backward-Forward Sweep method, and it can FEW_bP/4  
easily deal with load flow calculation in ungrounded distribution ku a) K!  
systems. The load flow method based on line-to-line voltage YxinE`u~  
component models can also decrease the calculation, and it @%
lBrM  
coincides with the real circumstance in .. BQ2wnGc  
]t
*[%4  

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