Given the particular energy-maximising performance objective, wave energy converter (WEC) systems are prone to exhibit highly nonlinear behaviour. We present, in this paper,a detailed dynamic analysis and control synthesis for the Inertial Sea Wave Energy Converter (ISWEC) system, deriving and considering a comprehensive associated nonlinear model. In particular, we adopt a harmonic balance (HB) method to achieve this objective, producing the so-called amplitude-frequency curves (AFC) for the corresponding ISWEC nonlinear model,derived via a Lagrangian approach. We demonstrate that the system can present a variety of different behaviours which are completely neglected by its linear model counterpart. Leveraging both the efficiency, and convenient representation of the HB method, we synthesise so-called‘passive’ (i.e. proportional) energy-maximising controllers using a variety of input conditions.We provide a comparison of the obtained control parameters with those arising from standard linear modelling, showing a consistent improvement in performance by effectively considering the relevant nonlinear ISWEC dynamics.

Dynamic analysis and performance assessment of the Inertial Sea Wave Energy Converter (ISWEC) device via harmonic balance / Carapellese, Fabio; Pasta, Edoardo; Faedo, Nicolas; Giorgi, Giuseppe. - 55:(2022), pp. 439-444. ((Intervento presentato al convegno 14th IFAC Conference on Control Applications in Marine Systems, Robotics and Vehicles (CAMS 2022) tenutosi a Lyngby, Denmark nel 14-16 September 2022 [10.1016/j.ifacol.2022.10.467].

Dynamic analysis and performance assessment of the Inertial Sea Wave Energy Converter (ISWEC) device via harmonic balance

Carapellese, Fabio;Pasta, Edoardo;Faedo, Nicolas;Giorgi, Giuseppe
2022

Abstract

Given the particular energy-maximising performance objective, wave energy converter (WEC) systems are prone to exhibit highly nonlinear behaviour. We present, in this paper,a detailed dynamic analysis and control synthesis for the Inertial Sea Wave Energy Converter (ISWEC) system, deriving and considering a comprehensive associated nonlinear model. In particular, we adopt a harmonic balance (HB) method to achieve this objective, producing the so-called amplitude-frequency curves (AFC) for the corresponding ISWEC nonlinear model,derived via a Lagrangian approach. We demonstrate that the system can present a variety of different behaviours which are completely neglected by its linear model counterpart. Leveraging both the efficiency, and convenient representation of the HB method, we synthesise so-called‘passive’ (i.e. proportional) energy-maximising controllers using a variety of input conditions.We provide a comparison of the obtained control parameters with those arising from standard linear modelling, showing a consistent improvement in performance by effectively considering the relevant nonlinear ISWEC dynamics.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2973494
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