Abstract
Ocean wave energy is one of the most abundant energy sources in the world. There is a wide variety of wave energy conversion systems that have been designed and developed, resulting from the different ways of ocean wave energy absorption and also depending on the location characteristics. This paper reviews and analyses the concepts of hydraulic power take-off (PTO) system used in various types of wave energy conversion systems so that it can be a useful reference to researchers, engineers and inventors. This paper also reviews the control mechanisms of the hydraulic PTO system in order to optimise the energy harvested from the ocean waves. Finally, the benefits and challenges of the hydraulic PTO system are discussed in this paper.
Highlights
The ocean covers about 70% of the earth’s surface and is considered to be one of the greatest renewable energy sources
In this concept (CP-Type XV), the secondary hydraulic power take-off (PTO) system is only used during the reactive mode, which means, during adjusting the phase velocity of the wave energy converter (WEC) device is in the primary hydraulic PTO system
The high potential of this renewable energy source and the rapid growth of wave energy conversion technology are driven by the need to bring this technology in line with the existing fossil fuel-based power generation
Summary
The ocean covers about 70% of the earth’s surface and is considered to be one of the greatest renewable energy sources. Apart from that, the direct-electrical drive PTO system is referred to the system which directly converts the mechanical energy absorbed by the WEC device to the electrical energy using the electrical machine or linear generator [12]. Since the mechanical interfaces are unnecessary, the friction energy loss from this moveable part is greatly reduced, can increase the power conversion efficiency [36] and reduce the maintenance cost for this system [37] This type of PTO system is well-suited for small-scale (
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