Probably the most powerful approaches for better estimations of initial values are One-Shot Fast-
Decoupled and One-Shot Gauss-Seidel methods. These procedures, often located in pre-processing
part of the Newton-Raphson method, improve the start points to better values which may be closer to
the final solution. Unfortunately due to their linear simplifications, networks with high R/X ratios can
significantly influence the convergence. Possible approach lies in the use of special technique
presented in [9] to slightly amend high R/X rates to avoid divergence. Currently, the One-Iteration
Fast-Decoupled algorithm is also used in commercial software package PowerWorld Simulator [7].