A Combined S-transform and Ensemble of DT based Protection scheme for six-phase transmission line

Abstract

The current transmission infrastructure must be able to transmit more electricity due to the alarming increase in energy consumption. Instead of relying on the constraints of three-phase double-circuit lines to meet the growing power needs, a new generation of six-phase transmission systems has emerged as a potential solution. The protection challenges with six-phase transmission systems are exceptionally challenging, however, because of the enormous number of probable flaws. Given the advantages of six-phase systems over three-phase systems in meeting rising power demands and the dearth of existing protection schemes for six-phase lines, there is room for the development of a consistent protection scheme for a six-phase system that can satisfactorily perform the proposed protection tasks under a wide range of operating contingencies. To that end, this research proposes a novel protection strategy based on an ensemble of decision trees and the S-transform. To train the fault detector/classifier, the estimated frequency and phase of the current signals in real time have been utilised as input characteristics, and the S-transform has been used to do so. With a one-cycle moving window, it is feasible to estimate the input characteristics in a recursive fashion. To ensure the anticipated scheme is applicable to a six-phase system, it has been subjected to extensive simulations of a variety of fault conditions with a broad range of fault characteristics. The proposed relaying approach can reliably detect and classify issues in a single cycle across all test cases.