Abstract
Wave energy, a high-quality renewable energy, is abundant in reserves and relatively stable. However, the wave energy power of the same sea area varies greatly in different seasons. The traditional linear generator cannot work efficiently in such a wide power range. This paper presents a segmented permanent-magnet linear generator structure, which is especially designed for the wave energy converter. This type of linear generator can match the wave energy power by increasing or decreasing the specific primary unit, making the generator more efficient over a wider range of wave power than the traditional type. This paper verifies the correctness by finite element analysis.
Highlights
The wave energy converter (WEC) is electromagnetic device that converts the kinetic energy of linear motion into usable electrical energy
This paper presents a segmented structure and its control method to broaden the range of efficient energy capture
A finite element analysis (FEA) of the segmented permanent-magnet linear generator is used to verify the effectiveness of the segmented structure
Summary
The electrical power dilemma, which has long been a worldwide problem, is one of the main factors restraining the development of remote islands. One method is to use hydrodynamic devices to convert linear motion into rotatory motion (oscillating water column device with an air turbine [6] and an over-topping device with a low head hydraulic turbine [7]). Another method is known as oscillating bodies technology. Among various oscillating body technologies, the point absorption WEC using direct-driven power take-off (PTO)has received much attention [5]. The actual experiment result is generally about 24% [12]
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