| Summary: | 碩士 === 國立臺灣海洋大學 === 系統工程暨造船學系 === 105 === In recent years, renewable energy has become the trend of energy policy. Taiwan is an island and the abundance natural energy resource is the marine energy. Among the several types of the marine energies, wave energy density is highest and worthy to be developed. The work to design a power conversion of point absorption nearshore wave energy conversion system is illustrated in this thesis. The power conversion system contains a linear electromechanical conversion device is demonstrated here. The float drives the conversion device to carry out periodic linear reciprocating motion to generate electricity. Due to the real generator volume is quite large and the price is higher, a small linear generator model is as the research object in this paper.The software Maxwell developed by ANSYS Inc. is used to simulate the magnetic field intensity and the induced voltage of small linear electromechanical conversion device. The space between of the inner magnet-sets and the turns and the dimension of the coils of the moving part are the variable parameters to calculate the electromechanical conversion ability. The induced electromotive force(emf) and electricity power computed by using of Matlab are also evaluated to determine the proper design parameters of the small linear electromechanical conversion device. The experiments of the best small model device were done to measure coil properties from the relationship between the moving part’s position and the induced emf.The wave energy point absorption device contains a rope which was tied with the float and was round through the pulley and connected to the moving part of the electromechanical conversion device was made in the thesis. There were two types: with fixed pulley and with moving pulley. The moving pulley type point absorption device can drive the moving part of the electromechanical conversion device faster and the induced emf was larger. Furthermore, the induced emf produce by the coils inside the moving part which was driven by the two type point absorption devices was simulated under same wave simulation condition. The results showed that electromechanical conversion device with larger space between the inner magnet-sets would own higher energy transfer ability and the electricity power of the induced emf would be larger.
Keywords: Linear generator, wave energy conversion device, point absorption nearshore wave energy conversion system, a block and tackle
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