Multi-axis point absorber wave energy converters. N2 - A multi-axis point absorber wave energy converter MA-PAWEC can be defined as a point absorber wave energy converter that absorbs energy from multiple modes of body motion using a power-take-off PTO system operating in multiple degrees of freedom. There is a lack of knowledge around whether MA-PAWECs could produce a lower cost of energy compared to the most common point absorber type, the heaving device. This research seeks to address this gap.
Wave Energy Converter
Wave Energy Research, Johannes Falnes, Physics, NTNU
In the age of energy transition, renewable energies are playing an increasingly important role. As a result of this, hydropower, solar and wind energy are becoming more important. In addition to these well-known examples of renewable energies, there is also the possibility to generate energy from ocean waves. Thereby, mechanical systems are positioned on the sea surface, which are subjected to an up and down movement by the arising waves. An internally installed electrical generator converts then this movement into electrical voltage.
Wave energy converters
Waves are a promising resource of renewable energy. The wave energy converters WEC are distinguished into three main categories: oscillating bodies, oscillating water columns, overtopping devices. The oscillating bodies are floats or other bodies which are moved by waves. The oscillating water columns exploit pressure generated by water surface oscillation for moving air through a turbine. Overtopping devices take advantage of the raise of water level caused by waves for storing the water in a reservoir and then exploiting the hydraulic head by an hydraulic turbine.
ISWEC Inertial Sea Wave Energy Converter is a Wave Energy Converter transforming the wave-induced rocking motion of a buoy into electrical power by means of the gyroscopic effects produced from a spinning flywheel carried inside the buoy. A unique feature of ISWEC with respect to most of the existing converters is that externally it is composed only of a floating body without moving parts working into sea water or spray, thus achieving a high reliability and reduced maintenance costs. The converter dynamics is analyzed in order to obtain a mathematical model and experimental tests are carried out in the wave tank of the University of Edinburgh on a model to validate such mathematical model.