The line of research Dynamic Network Analysis is responsible for developments and researches related the software programs Anatem and PacDyn. Anatem software focuses non-linear simulation of electromechanical transients of large electrical systems while PacDyn uses the linearized model, valid for small disturbances, for the application of modal analysis tools. In this line of research, the dynamic analysis is performed both, for large disturbances through simulation in the time domain aiming at assessing the system’s integrity and synchronism and for small disturbances aiming at identifying the slightly damped oscillation modes and controller adjustment.
The software programs Anatem and PacDyn are currently integrated, both, with regard to data files and to the simultaneous execution of each program for the same case allowing comparison of results. One of the objectives of this line of research is to keep this integration and the compatibility with other programs, such as Anarede (analysis of power system networks), PlotCepel (graphical visualization of the results), CDUEdit (user-defined controller editor) and EditCepel (text editor for data files).
Another major objective of this line of research is to meet the demands of the electric sector. Within this objective, Cepel researches new facilities of friendly use, improvement of graphical interfaces and visual presentation of results; improvement in solving methods, aiming at a greater robustness, effectiveness and precision; proposal of new methodologies for the analysis and development of new equipment models.
it is noteworthy that the research and development of new models is greatly facilitated by User Defined Controls (CDUs). This resource of both software programs allows control system modeling as well as accurately equation several components of new equipment.
The analysis of the dynamic performance of the National Interconnected System, including new equipment and technologies is conducted within this line of research. Some studies worth to mention are: those involving the integration of alternative energy sources, such as wind and solar, studies of energy harvesting of the North region, by Direct Current Transmission, using FACTS equipment, based on power electronics, assessment of reactors with natural saturation or controlled saturation, etc.
In addition to the analysis of mechanical oscillations, PacDyn performs analyses of subsynchronous resonance and adjustment of FACTS in high frequency, where the representation of the network dynamics is modeled in detail. Another objective of this line of research is the improvement of methodologies for higher frequency transients and the possibility to extend to non-linear simulation in the time domain.
Another target is conducting research and development related to power system security analysis. Dynamic security analysis uses as base an operating point, which can be in real time or in a study case of operation planning. The security analysis of this point is initially performed in static mode, using Anarede software, and next, the dynamic security can be assessed in both, non-linear simulation using Anatem and in the identification of natural oscillations of the system, using PacDyn. Within this line of research, Cepel is developing and implementing several methods of analysis, as well as different forms of graphical visualization, adequate for the system operator in real time or for the analyst in charge of operation planning. In addition, Cepel is conducting activities for the integration of security analysis tools in SAGE (Open Energy Management System) environment aiming at improving the reliability of the National Interconnected System.