Super Super decoupled Loadflow

Abstract

A generalized Super Super decoupled Loadflow referred to as SSDL-X'X' method is presented along with its special case manifestations leading to the proposed SSDL-YY method. Gain matrices of the SSDL-YY method are defined independent of rotation angles and they differ only in their diagonal terms. The diagonal terms in the gain matrix of Q-V sub-problem are characterized by the presence of transformed specified/known quantities. Rotation angles are limited to the maximum value of -48°, and the slack-start as a guess solution is suggested for increased efficiency. These along with simple modification of real power mismatches at PV-nodes yields a robust and fast loadflow method. An advanced version of the General-purpose Fast Decoupled Loadflow (GFDL) is manifested as SSDL-BX method. The proposed method is tested and compared with Fast Super Decoupled Loadflow (FSDL), SSDL-BX, and GFDL methods under wide range of simulated system operating conditions and network parameters. The proposed method is superior to the FSDL method under all most all conditions and can be more than twice faster than the SSDL-BX, and GFDL methods for systems having large R/X ratio branches.