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

Abstract--Some load flow methods in distribution power !mrB+<:  
systems, such as Backward-Forward Sweep method, Zbus 6TxZ^&=  
method, and Loop Impedance Method, advocate phase-to-ground iLn)Z0<\o  
voltage component. But in ungrounded distribution networks, the }`4o+  
ground reference is lost and the phase-to-ground voltage is YMwMaU)K,  
undefined, so the solution can’t be unique. Also in these t<9oEjk["  
ungrounded systems, admittance submatrices of transformers fR}|CP  
become singularity. The traditional Backward-Forward Sweep |]~tX zY  
method can’t handle these problems. This paper advocates lineto- oYnA 3  
line voltage component, avoiding the singularity caused by |HJdpY>Uu  
admittance submatrices of transformers in ungrounded A5tY4?|  
distribution power systems. Models of loads, transmission lines, |S
y|E  
transformers and induction motors are modified using this ;Br8\2=$  
component. We note that these models can be easily incorporated 'i_od|19~h  
into an implicit Backward-Forward Sweep method, and it can
Ze'AZF  
easily deal with load flow calculation in ungrounded distribution "?V4Tl~uu  
systems. The load flow method based on line-to-line voltage _CPe  
component models can also decrease the calculation, and it y@'8vOh`  
coincides with the real circumstance in .. =M)>w4-  
,)XT;iGQe  

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