This paper presents a comparative study between the conventional PI (Proportional Integral) and backstepping controllers applied to the DFIG (Doubly Fed Induction Generator) used in WECS (Wind Energy Conversion System). These two different control strategies proposed in this work are developed to control the active and reactive power of the DFIG on the one hand, and to maintain the DC-link voltage constant for the inverting function on the other hand. This is ensured by generating control signals for two power electronic converters, RSC (Rotor Side Converter) and GSC (Grid Side Converter). In order to optimise the power production in the WT (Wind Turbine), an MPPT (Maximum Power Point Tracking) algorithm is applied along with each control technique. To simulate the effectiveness of the proposed controllers, MATLAB/Simulink Software is used, and the obtained results are analysed and discussed to compare PI and backstepping controllers in terms of robustness against wind speed variations and tracking performance in dynamic and steady states.

This paper deals with the legal aspects of saving life at sea by the Maritime Search and Rescue Service (SAR Service). Depending on the situation, it is possible to provide assistance to a ship in distress at sea and to people on board, either from the sea by another ship, or from the land side, i.e. from the coast by specially prepared services. The effective functioning of the SAR organizational system determines the effectiveness of the SAR action in terms of the number of people saved from danger at sea. In order to provide assistance, SAR services around the world performs distress monitoring, communication, coordination, as well as search and rescue tasks, including the pro-vision of medical advice, initial medical assistance or medical evacuation, through the use of public and private resources, including associated aircraft. The tasks of the SAR services include organizing disembarkation of rescued people.