The Design Of Semi-submersible Wind-Tidal Combined Power Generation Device

Energy shortage is becoming more and more severely in the world,so does the environmental pollution problem.The exploitation and utilization of renewable energy has become an effective way to alleviate energy shortage and reduce environmental pollution.In order to improve the power production capacity,power output quality,income investment ratio,the comprehensive marine energy utilization has become an inevitable trend of marine energy development.At present,the most of the hybrid marine energy concept designs are still in the early stage of exploration.Based on the conclusions and experiences of these preliminary studies,this paper presents an overall design of a new semi-submersible wind-tidal combined power generation device which will turn out to be more reasonable.After the hydrodynamic analysis in frequency domain,the coupling hydrodynamic analysis of the energy device under complex ocean environment load in time domain is carried out by secondary development of AQWA to verify the rationality of the design scheme.In this paper,the design environment conditions are determined through the access to information first.Then,the paper selects an appropriate wind turbine and tidal current turbine for generation device.The main dimension of the marine energy device platform is further determined,so does the detailed design of the aggregate structure and the cabin layout of the platform components.Using the Maxsurf software,the hydrostatic curves and the ship coefficient curves of the platform are calculated.The initial stability of the platform is also checked,which proves the stability of the platform meet the regulatory requirements.Then,the three-dimensional frequency domain potential field theory is used to study the hydrodynamic performance of the wind-tidal combined power generation device.The RAO and hydrodynamic coefficients of the floating carrier platform in the regular wave are obtained.And then,through access to technical information and CFD numerical simulation method,the external loads of the carrier platform are determined.Based on that,the paper completes the mooring system preliminary design according to the design specification,presents the material and arrangement.In order to verify the rationality of mooring system design,this paper finally carries out coupling analysis of the platform motion response and mooring line tension in time domain.Firstly,the CFD method is used to solve the hydrodynamic load of the turbine during forced oscillation,and the hydrodynamic coefficient of the turbine is fitted.Then,the AQWA software is secondary developed.The additional mass,radiative damping and real-time changing loads of the turbine are loaded into the marine energy system.Finally,the time-domain coupling calculation of the system motion response and the mooring line tension in the irregular wave is realized.The results show that the semi-submersible wind-tidal combined power generation device has good safety in all design conditions and presents reliable power generation performance.This paper can provide theoretical guidance and technical support for the design,development and engineering application of wind-tidal current energy combined generation device.