Abstract
This paper addresses the sizing and design problem of a permanent magnet electrical machine power take-off system for a two-body wave energy converter, which is designed to support ocean sensing applications with sustained power. The design is based upon ground truth ocean data bi-spectrums (swell and wind waves) from Martha’s Vineyard Coastal Observatory in the year 2015. According to the ground truth ocean data, the paper presents the optimal harvesting power time series of the whole year. The electrical machine and energy storage static modeling are introduced in the paper. The paper uses the ground truth ocean data in March to discuss the model integration of the buoy dynamic model, the power take-off model, and the energy storage model. Electrical machine operation constraints are applied to ensure the designed machine can fulfill the buoy control requirements. The electrical machine and energy storage systems operation status is presented as well. Furthermore, rule-based control strategies are applied to the electrical machine for fulfilling specific design demands, such as improving power generating efficiency and downsizing the electrical machine scale. The corresponding required capacities of the energy storage system are discussed. This paper relates results to the wave data sets (different combinations of significant wave heights and periods of both swell and wind waves). In this way, the power take-off system rule-based control strategy determinations can rely on current ocean wave measurements instead of a large historical ocean wave database.
Highlights
Ocean sensing applications require sustained power to measure and collect data during extended periods in remote locations
This paper presents a novel methodology and procedure of integrating the power take-off (PTO) and energy storage systems (ESS) static model to the wave energy converters (WECs) buoy dynamic model while considering the electrical machine limitations
The converted high power from the slow buoy motion will result in current fluctuations in the bus, while it will influence the electrical drive design and ESS design significantly
Summary
Ocean sensing applications require sustained power to measure and collect data during extended periods in remote locations This calls for the design of energy systems capable of delivering such stringent demands. Typical solutions include wave energy converters (WECs), which rely on wave height to actuate an electromechanical or hydraulic system [1] to generate power. Direct drive WECs have the merit of simplifying the power take-off (PTO) system configuration by removing unnecessary gearboxes and hydraulic components They are designed for small or medium scale applications due to the limited PTO dimensions [6]. Off-board ESS is normally designed for larger power extraction WEC arrays connected to the grid, where the energy storage can be located offshore on floating platforms or onshore, and the purpose can be short-term for power quality improvement [14] or long-term for energy management [15]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
