Metodologias de co-simulação aplicadas a Sistemas de potência

Abstract

This master thesis presents co-simulation techniques for simulating dynamic transmission systems coupled to distribution systems. The co-simulation strategy allows complex and heterogeneous systems to be divided into smaller subsystems, whose modeling and solution can be implemented on specialized platforms. However, it is vitally important to ensure compatibility between system interfaces. In this context, the standardized FMI interface Functional Mock-up Interface will be used, which will allow the exchange of information from dynamic models embedded in FMUs (Functional Mock-up Units). Furthermore, as FMUs can be distributed as compiled dynamic-access libraries, they can be shared while intellectual property is protected. Although co-simulation has not been widely explored for dynamic studies of power systems, the technique can be effective for dynamic studies of coupled systems. In this context, transmission and distribution systems can be simulated on different computational platforms, with their most efficient techniques, that exchange data between them in a cyclical way. Thus, five co-simulation techniques will be presented in this work. Co-simulation tests will be presented, using the ficticious line methodology, between systems modeled in Modelica and embedded in FMUs. The results showed that the co-simulation quite faithfully replicated the simulation results for the same modeled system completely, without partitions, obtained in OpenModelica. In addition, the proposed strategy presented reduced computational times and, in some situations, proved to be the only alternative to simulate the proposed studies. In this work, methodologies for co-simulation between FMUs and distribution systems modeled in OpenDSS were also reported. Delays observed in the ficticious-line-based strategies and in the delayed method were completely eliminated through alternating iterative methods. These methods also made it possible to reduce computational time while maintaining the accuracy of the results.