Balancing Power Output and Structural Fatigue of Wave Energy Converters by Means of Control Strategies

Francesco Ferri, Simon Ambühl, Boris Fischer and Jens Peter Kofoed
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Francesco Ferri: Department of Civil Engineering, Aalborg University, Sohngaardsholmsvej 57, Aalborg, Denmark
Simon Ambühl: Department of Civil Engineering, Aalborg University, Sohngaardsholmsvej 57, Aalborg, Denmark
Boris Fischer: Division Control Engineering and Energy Storages, Fraunhofer Institute for Wind Energy andEnergy System Technology (IWES), Koenigstor 59, Kassel, Germany
Jens Peter Kofoed: Department of Civil Engineering, Aalborg University, Sohngaardsholmsvej 57, Aalborg, Denmark

Energies, 2014, vol. 7, issue 4, 1-28

Abstract: In order to reduce the cost of electricity produced by wave energy converters (WECs), the benefit of selling electricity as well as the investment costs of the structure has to be considered. This paper presents a methodology for assessing the control strategy for a WEC with respect to both energy output and structural fatigue loads. Different active and passive control strategies are implemented (proportional (P) controller, proportional-integral (PI) controller, proportional-integral-derivative with memory compensation (PID) controller, model predictive control (MPC) and maximum energy controller (MEC)), and load time-series resulting from numerical simulations are used to design structural parts based on fatigue analysis using rain-flow counting, Stress-Number (SN) curves and Miner’s rule. The objective of the methodology is to obtain a cost-effective WEC with a more comprehensive analysis of a WEC based on a combination of well known control strategies and standardised fatigue methods. The presented method is then applied to a particular case study, the Wavestar WEC, for a specific location in the North Sea. Results, which are based on numerical simulations, show the importance of balancing the gained power against structural fatigue. Based on a simple cost model, the PI controller is shown as a viable solution.

Keywords: passive control; active control; model predictive control (MPC); fatigue analysis; wave energy converter (WEC); wavestar (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2014
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (14)

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