Abstract
This paper studies the power flow computation for advanced distribution systems where multiple PV-buses appear. The background for this study is that with the introduction of various dispersed generation sources into modern and future distribution systems, it may be necessary to treat multiple PV-buses in distribution power flow calculations. Meanwhile, in analysing and planning such complex systems, hundreds or thousands of power flow computations are required. Therefore efficiency of the power flow method is of vital importance for reducing the computing burden. The method presented in this paper is a modification to conventional implicit Z matrix method by which only one voltage specified bus can be dealt with efficiently. The modification is based on direct mathematical derivation and therefore overcomes drawbacks of heuristics based techniques. The method tries to solve for the total unknown variables simultaneously without use of trial and error iterations. Computational experience shows that the method is especially suitable for power flow study of distribution systems. Comparisons with Newton power flow method are provided to illustrate the efficiency of the method.
