Fast three phase load flow methods

In this paper, three-phase sequence decoupling-compensation models of unsymmetrical transmission lines are introduced. By combining these models with the well-known Newton-Raphson and fast-decoupled algorithms, two novel methods-sequence decoupling-compensation Newton-Raphson (SDCNR) and sequence decoupling-compensation fast-decoupled (SDCFD) methods-used for three-phase load flow studies are proposed, which can be used to analyze both normal and abnormal three-phase power system steady-state operation. The computation accuracy, computation speed and convergence characteristics of these methods are then investigated. From these investigations, their advantages of high accuracy, high speed, reliable convergence are verified. In this paper, parallel implementation of these methods is also discussed.