Research On High Efficiency Wave Energy Capture Technology Of Buoy-Rope-Drum

With the rapid development of economy,the problem of energy exhaustion and environmental pollution is becoming more and more serious.Finding new clean and renewable energy has become an urgent requirement for the sustainable development of human society.As one of the new energy sources,ocean wave energy has numerous advantages,such as huge reserves,high energy density and wide distribution.The development and utilization technology of ocean wave energy is highly valued by human society.At present,the oscillating float wave power device has become a research hotspot of wave power utilization technology because of its advantages of high reliability,low cost and high efficiency.The buoy-rope-drum wave power device belongs to oscillating float wave power device.In order to further improve its wave energy capture efficiency,this paper studies the feasibility of improving the wave energy capture efficiency of buoy-rope-drum wave power device by resonance technology and latching control technology.The main work done in this thesis is summarized as follows:(1)According to the actual sea conditions in the test area,the finite-depth linear wave theory and Morrison equation are selected to calculate the wave loads.AQWA is used to solve the hydrodynamic coefficients such as additional mass.By equivalent the rope wheel mechanism to spring damping module,and reasonably setting the external damping coefficients,OrcaFlex is used to realize the hvdrodvnamic simulation of the buoy-rope-drum wave power device,and the formula for calculating the wave energy capture efficiency of the floating rope wheel is derived.(2)Based on the resonance principle,two comparable models of the buoy-rope-drum wave power devices,resonance type and non-resonance type,are constructed.Using the formulas mentioned above and taking the maximum wave energy capture efficiency as the optimization objective,the optimal wave energy capture efficiency of the two device models under the same wave condition is optimized and calculated respectively.By comparing the two efficiency,the feasibility of improving the capture efficiency of the floating rope wheel wave energy device by resonance technology is verified.(3)Based on the idea of equivalent external structure of rope wheel mechanism,a comparable resonant and non-resonant floating body model is constructed,and a wave energy capture test platform is established.The optimal wave energy capture efficiency of the two models under the same wave condition is obtained by model test,which verifies that the technical route of improving the capture efficiency of the floating rope-wheel wave energy device by resonance technology is not feasible.(4)The latching control of wave energy device is realized by using Winch module of OrcaFlex.Taking the maximum wave energy capture efficiency as the optimization objective,the locking time is optimized and the maximum wave energy capture efficiency is obtained.By comparing the maximum wave energy capture efficiency of the wave power device with or without latching control under the same sea conditions,it is proved that the latching control technology can effectively improve the wave energy capture efficiency of the buoy-rope-drum wave power device.