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Power Take-Off System

Modularised Plug-and-Play Solution 

The power take-off of a wave energy converter is defined as the mechanism with which the absorbed energy by the primary converter is transformed into useable electricity.  The PTO system is of great importance as it affects not only directly how efficiently the absorbed wave power is converted into electricity, but also contributes to the mass, the size and the structural dynamics of the wave energy converter (WEC). 


By having this direct influence on the wave energy converter, the PTO system has a direct impact on the Levelised Cost of Energy (LCoE).  The PTO system has a direct effect on the efficiency of power conversion; hence, it has a direct impact on the annual energy production.  The reliability of the PTO system affects the availability (the energy production) and the operation and maintenance cost. 

Our PTO system has undergone step changes and modifications from the experience learnt through rigorous modelling, tank testing and validation in real ocean environment.  We have now built a robust and reliable commercial PTO system that requires very little maintenance throughout the 30 years life design of the system.  The PTO system, designed to operate in all sea conditions, is now ready for onshore demonstration at full scale.  It is 100% environmentally friendly, with no negative impact on marine life, no contaminants and zero emissions.

To ensure the cost-effectiveness of the WEC system, a control strategy is carefully designed for the PTO system to respond to the irregularity of each incoming wave by adjusting the stiffness and the damping of the PTO system.  With a simplified design and highly efficient air turbine, the efficiency of the system is thereby increased and hence its cost-effectiveness. 

The same PTO system is used for all product ranges of our wave energy converter technology, shallow water and deep water applications, with small adjustments to suit any given project location.

A state of the art full scale test facility is currently being prepared for demonstration activities to interested parties between July to October 2017, to showcase our full scale 1MW PTO system performance and attractive economics.  Click here to read more about the test facility.  

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