Energy Evaluation Methodology Based On The R&d Of Wave Energy Converter

With the traditional fossil energy exhausting, using renewable energy becomes one ofthe world’s energy development directions. There are long coastline and much oceanenergy resource in China. The use of wave energy has a brightly prospect. With the waveconvert device form varied, many devices have been widely used in business. Comparedwith the development of the wave convert device, the development of the wave evaluationmethod is comparatively backward. The wave evaluation method is just the evaluation ofenergy resource in the ocean and can’t evaluate the wave energy captured by wave energydevice. This paper analyzes the Oscillating Water Column (OWC) wave energyconvertor, Dish-Type Overtopping Wave Energy Convertor (OWEC) and Oscillating BuoyWave Power Device (OD) and presents a new method of wave energy assessment.The paper given includes the derivation of wave energy resource information fromboth wave model results and from wave measurements. In the case of wavemeasurements the treatment includes descriptions of a number of measuring systems aswell as the principles of quality control and spectral analysis. The paper is extendedoutside strict resource assessment to give a method for the calculation of Wave EnergyConversion Systems (WECS) energy production which may be used when information onWECS performance is available.In order to recognize the effect of the marine environment element to wave energyconvertor, the performance of the OWC, OWEC and OD is analyzed in this paper. Theinfluence to the output of device is wave height and period. The analysis results showthat:For the OWC, the higher the wave height is, the more the output power of deviceis. For short wave period (T≤6s), the output power is increasing with the periodincreased. For long wave period (T>6s), the wave period has little effect to the power.For the OWEC, the higher the wave height is, the more the output power of deviceis. The smaller the wave period is, the more the output power of device is.For the OD, the higher the wave height is, the more the output power of device is.The wave period has little effect to the power.The standard output power is PE=5kW. The wave conditions for the three types ofthe devices are following: the OWC is wave height H=1m~2m and wave period T=6s~9s;the OWEC is wave height H=1.5m~2m and wave period T=6s~7s; the OD is wave heightH=1.5m~2m and wave period T=5s~8s.The SWAN model is used to simulate the wave field of Dangan island. The waveheight, wave period and wave length of Dangan island is obtained by the numericalsimulation. Among with the three types of the devices, the OD is appropriate for thewave field.