Hi Abdelkrim, I would recommend you have a look at the paper,
Baran, M.E.; Wu, F.F., "Optimal sizing of capacitors placed on a radial distribution system," in Power Delivery, IEEE Transactions on , vol.4, no.1, pp.735-743, Jan 1989 It has a nice mathematical formulation of how voltage drops in a radial system, based on the power flow on the lines. Cheers, -Carleton > On Nov 19, 2015, at 7:15 AM, Ray Zimmerman <[email protected]> wrote: > > In general, the voltage tends to drop as you get further from the source, if > loads are evenly distributed and line parameters are similar. In your > example, however, you have a much larger load at bus 9 than at bus 8, and in > particular, there is a large reactive load at 9, pulling down the voltage. > The low load at 8 and the relatively large line charging capacitance of the > 8-9 line help to support the voltage at 8, relative to 9. > > Ray > > > > >> On Nov 18, 2015, at 11:11 AM, ALI ZAZOU Abdelkrim >> <[email protected]> wrote: >> >> Hi, >> >> my question is about the voltage level of each buses in a radial >> distribution system. My understanding of this phenomena is that the voltage >> level of the "farest" (in term of r and x) bus will have the lowest voltage >> level if there is no generation or voltage regulator between the slack bus >> and that bus? Am I getting it wright? >> >> Because in the above example, based on the modified iee9_bus case given by >> the tool, i get a strange behaviour. The last bus (8) don't have the lower >> votage level, so based on that how can that factor be explained? >> >> You can find attached to the email, the test case and a figure of the graph >> of the network. >> >> Thank you very much for reading my question >> Abdelkrim >> <9_modif.png><case9_modif.m> > > > ________________________________ The information in this e-mail may be confidential and subject to legal professional privilege and/or copyright. National ICT Australia Limited accepts no liability for any damage caused by this email or its attachments.
