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Stalling-Free Control Strategies for Oscillating-Water-Column-Based Wave Power Generation Plants

2017; Institute of Electrical and Electronics Engineers; Volume: 33; Issue: 1 Linguagem: Inglês

10.1109/tec.2017.2737657

1558-0059

Fares M’zoughi, Soufiene Bouallègue, Aitor J. Garrido, Izaskun Garrido, Mounir Ayadi,

Wind Turbine Control Systems

The rising use of renewable power generation plants is highlighting the need for an integrated research combining multiple disciplines in order to achieve a commercially competitive technology stage. The demonstrative NEREIDA wave power plant installed in the northern coast of Spain constitutes a good example of this effort. This paper deals with the design, modeling, and control of the oscillating-water-column-based wave energy converter in order to maximize the power output of the NEREIDA power plant. The power optimization relies on two control strategies proposed to avoid the stalling behavior, a characteristic drawback of the Wells turbine, which limits the system's power. The first control strategy is an airflow control using a PID controller tuned by the particle swarm optimization algorithm and its recent memetic variant called fractional particle swarm optimization memetic algorithm. This controller will control a throttle valve to regulate the airflow in the turbine duct. The second one consist of adequately controlling the rotational speed of the generator by means of the rotor-side converter of the back-to-back converter connected to the doubly fed induction generator to provide a swift way to respond to the rapid variations in the turbine speed. The results show that both controls provide a higher power generation compared to the uncontrolled case.