Re: Ideally coupled busbars

[Carlos E Murillo-Sanchez]

Unfortunately, this problem is of an intrinsic nature.  If it is an OPF that you are running, you might try using additional linear constraints to equate the two bus bars magnitudes and angles, and hope that the underlying linear algebra algorithms will deal with the singular constraint matrix appropriately.  But I would suggest instead to write two different special-purpose functions: one taking the data of the original system and collapsing the two busbars into a single one, then run whatever you want on it, and another function taking the results and splitting the bus bars again.  MATPOWER does not detect such issues in the data, but if it were to do so, this process would probably be part of the pre-processing and post-processing of the data (in the same way that it does renumbering of bus bars and so on). carlos. Hendrik Acker wrote: Hi everyone, dear Mr. Zimmerman   I’m having problems with implementing ideally coupled bus bars. In the UCTE Format 2 bus bars are coupled with an branch which has R=0 X=0 and B=0. Matpower however cannot work with this as the Matrix singular. If I put R=0 and X small I get really weird high flows of P=XXX^6 MW. What can I do to couple 2 busbars? (Except replacing them by only 1 node-point)   Best regards   M.sc. Hendrik Acker   ***************************************************************** Technische Universität Kaiserslautern Fachbereich Elektrotechnik und Informationstechnik Lehrstuhl für Energiesysteme und Energiemanagement Erwin-Schrödinger-Straße 67663 Kaiserslautern Tel.: +49 (0)631 / 205 - 3037 Fax: +49 (0)631 / 205 - 2168 Mail: ac...@eit.uni-kl.de