Abstract
Oscillating water column (OWC) systems are water power generation plants that transform wave kinetic energy into electrical energy by a surrounded air column in a chamber that changes its pressure through the waves motion. The chamber pressure output spins a Wells turbine that is linked to a doubly fed induction generator (DFIG), flexible devices that adjust the turbine speed to increase the efficiency. However, there are different nonlinearities associated with these systems such as weather conditions, uncertainties, and turbine stalling phenomenon. In this research, a fuzzy logic controller (FLC) combined with an airflow reference generator (ARG) was designed and validated in a simulation environment to display the efficiency enhancement of an OWC system by the regulation of the turbine speed. Results show that the proposed framework not only increased the system output power, but the stalling is also avoided under different pressure profiles.
Highlights
Global warming is a subject undergoing intense study nowadays as a consequence of the pollution generated by fossil fuels
Variable features are present in oscillating water column (OWC) and in wind turbine generators (WTG), which are usually linked to a doubly-fed induction generator (DFIG), and, the same theories can be used in OWC
As an amplitude of 750 Pa is below the stalling point, another suitable comparison would be with a higher pressure so that this point is reached with a profile as Figure 12 exhibits
Summary
Global warming is a subject undergoing intense study nowadays as a consequence of the pollution generated by fossil fuels. Despite the fact that photo-voltaic and wind sources are being focused on in research, hydro-power is still one of the biggest sources for renewable electricity generation [3]. The latter implies that a turbine propeller is being moved through water force; an alternative is the usage of ocean waves to cause a propeller movement with air in an oscillating water column (OWC) device. An OWC consists of a partial submerged chamber where the inside water oscillates as a consequence of the wave motion, and a turbine moves with the air pressure change inside the chamber where a generator is linked to the turbine and a power converter. Increase the performance of the overall system [10], the costs of these devices are higher than a DFIG due to the usage of rare earth materials for its production [11]
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