Control strategy of the MGR Wave Energy Converter (WEC)

Abstract

This paper presents the control strategy proposed for a new wave energy converter (WEC) design, the MGR. The control aims to maximise the energy absorption from waves, adapting converter's resistance to the incoming wave size. The MGR is a near shore submerged converter that takes advantage of the oscillating water column created by the wave when it passes on the converter's platform. The wave column moves the platform, transmitting the force to a single acting cylinder, that pumps sea water to the coast, where is turbined generating electricity. The control strategy is based on adjusting the system pressure to the coming wave size to create the optimal resistance, absorbing the maximum energy from it. The pressure is controlled by the aperture of turbine jet, positioning jet needle. In addition, the PLC implements the synchronous generator's load (torque) in order to maintain the turbine working at the maximum efficiency rotation speed