Modelling of a wave energy converter array with non?linear power take?off using a mixed time?domain/frequency?domain method

A mixed time-domain/frequency-domain method is proposed for modelling dense wave energy converter (WEC) arrays with non-linear power take-off (PTO). The model based on a harmonic balance which describes the system response in frequency domain, while evaluating PTO force and solving equations of motion time domain. computed Lagrange multipliers. In order to apply WEC array responses real sea states, series split into windows simulation carried out individually per window. demonstrated by investigating dynamics Ocean Grazer (OG-WEC) an adaptable piston pumping system. key parameters thought possibly influence accuracy, including number components, length window overlay, are discussed. It shown that can significantly reduce computational cost acceptable accuracy penalty.