SUMMARYThis paper addresses the design and simulation validation of a direct drive surge wave energy converter (DDSWEC) as an efficient device for harnessing marine wave energy in near-shore locations. The proposed DDSWEC is composed of a rigid rectangular plate producing linear motions in response to surge forces of ocean waves. A translator is devised to transfer the wave energy to a linear permanent magnet synchronous generator, which all together form the power take-off (PTO) system. In the proposed scheme, the mechanical simplicity of PTO system is a superior feature in reducing power losses in the wave-electric power conversion chain. Additionally, suitable mechanical degrees of freedom lead to an impressive increase in the power conversion efficiency. Besides, mathematical modeling of the mechanical and electrical systems governing DDSWEC is interrogated in depth. In addition, through a comprehensive frequency contents analysis, the capture width of DDSWEC and the device efficiency are scrutinized to validate its well performance. Because the stochastic behavior of waves induces voltages with variable frequency and magnitude, which are undesirable features for grid integration, a full-scale back-to-back converter with both generator and grid-side controls is accordingly implemented. To validate the overall performance of the proposed DDSWEC, a test system is designed in Matlab/Simulink platform by which several time-domain simulations for both the monochromatic and irregular waves are conducted.

In last decades, in effect of high price of fossil fuel, environmental pollution due to fossil fuel utilization and greenhouse effect, renewable energy resources are considered as an alternative energy resource to the World s excessive energy demand. Nowadays, different technologies are utilized to energy generation from hydro power, fuel cell and hydrogen, biomass, geothermal, solar thermal, photovoltaic and wind, while the technology for converting ocean powers are still in infancy. The aim of this chapter is to introduce potential renewable power sources of ocean, mostly ocean wave power, as well as available technologies for extracting wave power. Due to high energy amount available in ocean, the issue has a strong importance to investigate. Furthermore there are variety of technologies that are developed for harnessing wave power each of which has an individual mechanism. Harvesting ocean wave power and converting to electrical power is a challenge for marine, mechanical, electrical and control engineers and we hope to give essential information about ocean wave, methods of energy extracting from wave and related electrical equipment. . . OceanThe oceans contain . % of total world water which are covering % of Earth s surface [ ]. "lso the oceans intrinsically are couple with atmosphere via air-water interface and they exchange heat, moisture, momentum and trace constituents by means of air-water interface [ ]. The fundamental processes that transfer energy from atmosphere to ocean are energy input to ocean by wind and net surface heat flux [ ]. Furthermore, ocean absorbs heat of geothermal energy via geothermal vent in ocean bed. So that, oceans are vigorous and ubiquitous sources of renewable energy which contain TWh of energy annually [ ]. Energy in oceans comes in various forms such as tides, surface wave, thermal gradient,

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