A modification to the fast decoupled power flow for networks with high R/X ratios

The reliability of the fast decoupled load-flow method for most power systems is high, but it presents difficulties in convergence for systems with high ratios of branch resistance to reactance. Modifications that retain the advantages of this method but can handle high r/x ratios are of interest, and compensation techniques have been used for this purpose. Both the series and parallel compensation techniques, however, give mixed results. A modification is presented that performed better on several test systems. The test results show that this method not only converges well for systems with high r/x ratios but also is only slightly less efficient than the fast decoupled method for systems with normal ratios.