Novo método de extração fasorial baseado no integrador generalizado de segunda ordem para cossimulação de transitórios eletromagnéticos e eletromecânicos

Abstract

Co-simulation has concentrated attention on the context of smart grids and the increasing complexity of power systems. However, it is not fully developed and some points are not addressed in the literature. For example, phasor extraction and the discrete nature of communication, introduce errors and delays into the interface. In this context, the general objective of the work is to develop a more accurate Electromagnetic Transients (EMT)–Transient Stability (TS) co-simulation interface when considering faults and failures that cause network frequency variations. Thus, a new phasor extraction method based on complex Signals (CS) and Hilbert Transform (HT) is proposed. The topology used to synthesize the definition of Time–Varying Phasor (TVP) was the Second Order Generalized Integrator (SOGI)–(TVP), as it fits the requirements of the interface bus. In addition, it was proposed a dynamic co-simulation modeling methodology for stabilities studies. The numerical results, the stability studies, and the application in a medium-sized system have shown that the proposed method is fast, stable, can track the frequency with accuracy, and is capable of rejecting disturbances, in addition to having a low computational burden. SOGI-TVP has shown itself superior in some items compared to the conventional methods, Least-Squares Error Curve Fitting (LSCF) and Discrete Fourier Transform (DFT). The main impacts of this work are (i) that the proposed extraction method can contribute to systematization and expansion of the scope of use of co-simulation, since it uses solid bases for the definition of TVP; and (ii) that the proposed stability study methodology is generic and can be used to verify the stability of other extraction methods, communication protocols, or more complex systems, contributing to new research and advances in the technology of co-simulation.