A class of globally stabilising controllers for the control of wave energy devices for potable water production

A. Lekka, M.C. Turner, and J.V. Ringwood – 2012 IEEE International Conference on Control Applications, October, 2012


This paper provides a stability analysis for a system that captures wave energy in order to produce potable water. The system is a Wave Energy Converter (WEC) of the point-absorber type coupled to a hydraulic Power Take-Off (PTO) that converts wave energy into pressure. Previous work has used a partial state-feedback controller with integral action and feed-forward to provide good nominal control behaviour. Although open-loop stability was proven previously, no guarantees of closed-loop stability were given; in this paper we provide such guarantees for a class of controllers, of which the previously proposed controller is a special case.



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