Fast decoupled load flow via axis rotation

Abstract

A simple and effective techniwue to improve FELF convergence property on system of high R/X ratio is present. The main idea is again rotation to the load flow equations like one proposed by Haley, P.M and Ayres, M\^5)^. But, unlike latter we introduce only a single rotation to all equations which greatly simplify the formulation.Moreover, instead of working in rectangular coordinate the new method is in polar so that its in corporation into existing Fast Decoupled Load Flow (FDLF) require very little effort. Another different is on how the new method treat PV-Busses. Thisis the most difficult problem to hamdle since applying only a single rotation to all loadflow equations will create problem at PV-Busses which have only active power injection specified. Haley and Ayres solves this problem by leaving all PV-Bus equations unroated which may limiting the effectiveness of the rotation if some lines incidence to those busses have high R/X ratio. Numerical tests on IEEE 14, 30 and 57 busses systems of this method will try to know that this method has similar or better convergence in every case compared to Stott/Alsac, Amerongen’s or Rajicic/Bose FDLF.departmental bulletin pape