| As the fastest growing and most widely used renewable new energy power generation technology,wind power has achieved large-scale and large-scale application worldwide.Based on the limitations of onshore wind power and the growing maturity of offshore wind power development technologies,the development trend of the wind power industry from land to sea and from offshore to the open sea has taken shape.With the increasing depth of seawater,fixed wind turbines have been unable to meet the requirements of cost and environment,and floating wind turbines that are not limited by water depth and low construction cost have become the mainstream of research.The floating wind turbine is always in an unbalanced and unsteady state due to its unfettered floating foundation.This complex motion state in turn affects the normal operation of the floating wind turbine,reduces power generation efficiency,causes deformation of the tower and blades,and even causes tower buckling and platform overturning.Therefore,how to ensure the safe and stable operation of floating wind turbines in a complex marine environment efficiently and economically has become an important issue to be solved urgently in the construction of offshore wind power industry.In this paper,three types of floating wind turbines,Barge type,floating type(Spar type)and semi-submersible type(Semi type),are used to study the dynamic model of floating wind turbine and based on the established floating wind power.The dynamics model of the three types of floating wind turbines under the combined action of complex wind,wave and flow loads is compared.In order to improve the stability of three floating wind turbines,it is proposed to establish a dynamic model of aerodynamic-hydrodynamic-control-TMD-structure coupling using structural control method(passive liquid mass damper,TMD)for stable control.The stability control effects of three kinds of floating wind turbines under the combined action of complex environmental loads are compared.Based on the principle of superiority and superiority,and considering the shortcomings of TMD,the barge-type floating wind turbine with the best TMD control effect further proposes the use of Multiple Tuned Mass Dampers(MTMD)for stability control.At the same time,due to the large number of parameters of MTMD,the parameter design is different,and the control effect is different.Aiming at this problem,it is proposed to use the global optimization algorithm-Multi-Island Genetic Algorithm(MIGA)for parameter optimization,to study the influence of different parameters on the control effect and the optimal MTMD control effect under different sea conditions.conclusion as below:1.Considering the mutual coupling effect of wind,wave and flow load,the dynamic response of three floating wind turbines under complex environmental loads is compared.The results show that the dynamic response of three floating wind turbines is not changed after running for a period of time.The same;the motion response of the Barge-type floating wind turbine is almost far greater than that of the other two platforms.The dynamic response of the Semi-type floating wind turbine and the Spar-type floating wind turbine are similar,but the dynamic response of individual indicators.There is a huge difference.2.After TMD control,the dynamic response amplitude of the Barge floating wind turbine is reduced,and has more superior wave frequency characteristics.The vertical angle of the platform and the vertical displacement control of the tower are obviously effective,and the stability is significantly improved by 53.60% and 60.30%,respectively.The reduction of the first roll angle of the Spar type floating wind turbine platform is not obvious,and the stability is only improved by 9.75%;the control effect of the longitudinal displacement of the tower top is good,and the stability is improved by 29.79%.The platform’s first roll angle of the Semi-type floating wind turbine has no control effect;the TMD control effect of the longitudinal displacement of the tower top is obviously improved,and the stability is improved by 28.46%.3.After TMD control,the response of the Barge-type floating wind turbine is greatly reduced in the direction of the first roll of the platform,which is close to the response of the Spar-type floating wind turbine,but still greater than the response of the Semi-type floating wind turbine;In the longitudinal displacement direction,the Barge-type floating wind turbine is close to the response of the Semi type,which is larger than the response of the Spar type floating wind turbine.TMD has the best control effect on the Barge floating wind turbine,followed by the Spar type,which has the worst control effect on the Semi type.4.The MTMD parameters are globally optimized by MIGA algorithm.The results show that the vertical displacement and platform roll angle of the floating wind turbine are similar to the MTMD parameters.The response amplitudes of both the random cabin TMD quality and the tower TMD quality increase.Decrease,increasing as the TMD damping increases.When the quality of the cabin TMD is constant,the longitudinal displacement of the tower top and the roll angle of the platform are more obvious with the TMD damping trend,and the trend of the TMD quality with the tower is smaller;when the mass of the tower TMD is constant,the longitudinal displacement of the tower top The influence of mass change of the TMD in the random cabin of the platform roll angle is relatively large,and the degree of influence with the damping of TMD is small.When the TMD damping is constant,the change of the mass of the TMD of the tower hardly causes the longitudinal displacement of the tower and the platform roll.The change of the angle;that is,the longitudinal displacement of the tower top and the roll angle of the platform are most affected by the quality of the TMD in the cabin,the influence of TMD damping is second,and the quality of the tower TMD is the least.5.By comparing and analyzing the dynamic response of floating wind turbines in the absence of control,STMD control and optimization of MTMD control,it is found that the optimal MTMD control effect is best.Among them,the vertical displacement of the tower top and the stability of the platform roll are increased by 84.2% and 86.3%,respectively.It verifies the accuracy of the MIGA optimization results and provides a theoretical reference for the application of MTMD to floating wind turbines.6.MTMD has different control effects on the structural motion of different parts of the floating wind turbine.The best control parts are the longitudinal displacement of the tower top,the lateral bending moment of the tower base and the roll angle of the platform.Under different environmental conditions,MTMD has obvious control effects on floating wind turbines.The standard deviation inhibition rate of longitudinal load and displacement is 10%~78%,and the lateral load and displacement are 8%~84%. |
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