Doctorant sous la direction de G. DAMM

The economic and social development leads to an increasing demand for energy sources, especially in the form of electricity. However, great economic and industrial centers are usually located far from unexploited energy resources, which leads to a continuous search for new technologies for power transmission over long distances. Electric power transmission systems based on Direct Current (DC) are increasingly taking place in the global electric scenario. In fact, for long-distance, HVDC becomes an economical option.

Furthermore multi-terminal HVDC is an emerging  technology of great interest in Brazil and exterior. Research efforts that address the major challenges involved in the use of this type of transmission systems is needed. It is noteworthy that most part of the methods developed for AC systems are not applicable for DC systems. In this context, it is proposed the study of protection methods for Multi-terminal HVDC networks by analyzing the system’s natural frequencies and by the injection of signals with known waveform, which do not disturb the system operation. Regarding to HVDC systems natural frequencies, they arise from electrical interaction between its elements, such as harmonic components generated by the converter switching. Signals with known waveforms will be synthesized and injected into the transmission lines and their reflections in the system will be studied. To attain this goal, it will be important a large work on modeling DC and AC grids, and stability analysis tools to assess the interactions on those grids. The final goal would be to ensure some Plug-and-Play properties to the Multi-terminal HVDC grid that could reliably cope with faults.