Predictive control indicates a wide family of advanced control techniques that in last decade have been investigated in several studies and researches in the electrical drive field. This paper considers one of them, named Model Predictive Control (MPC). There are many advantages and interesting aspects in the use of this control technique compared to more traditional techniques that are usually employed in electrical drives. The typical cascade structure of FOC algorithms, for instance, can be avoided by implementing a single controller that manages both speed and currents. The innovation proposed within this paper is the application of Model Predictive Control to an IPM synchronous motor drive. Herein, special attention is given to the system's non-linearities and how the controller can be modified to realize flux-weakening and other control strategies. After a detailed description of the strategy that has been implemented, in the last part of the paper most important results obtained by simulations and by testing on a real drive are shown and discussed.

The scope of the paper is to further present and discuss, in continuation of OTC-28839-MS paper, the results of our technology development program regarding very long oil tiebacks architectures (50-100km) and enabling technologies. It is arrived the time when long tieback solutions are considered for real development projects. The paper will describe how those technological solutions compare with more conventional development schemes in concept selection phases and how our Operating Company is getting prepared for potential implementation. The paper will review key enabling technologies, together with their readiness level and discuss drivers for integration and operation. Sizing references will be presented as a result of Front End Engineering and Design activities developed for real project development opportunities. Technical performances will be discussed and technical-economic indicators will be provided. Risks during development and production will be analyzed and mitigation will be evaluated. A combination of heated high thermal performance flowlines, subsea multiphase boosting, subsea power management, innovative preservation procedures, newest subsea production components together with a reliable integrated control system and digital technologies are the key enablers of a very long tieback solution that may work as kind of highways to bring back production of a whole area to a production hub. Technically the way to go and the gap to cross appear manageable in mid to short terms opening new opportunities for deepwater asset development. It appears now possible to reduce deepwater development costs by increasing the distance between new assets and existing production hubs, shallow water areas or even connecting those assets to shore.