Differential Evolutionary Algorithm Based Optimization Of Pre-Stressed Concrete-Steel Combined Structure Wind Turbine Tower

In the background of "carbon peaking and carbon neutrality goals",vigorously developing new energy is not only the demand of national energy strategy but also the direction of development of the times.As an integral part of clean power,wind power has a lot of scope for further development.With the termination of wind power subsidies,cost reduction,and efficiency gains have become the future direction of wind power development.Tower is an important bearing structure of wind turbines,the cost accounts for about 1/5 of the total cost of the unit,and as the wind turbine continues to increase,the cost of the tower structure will also be increased.Therefore,choosing a reliable tower structure form and optimizing the tower structure has strong practical value for tower design and reduce tower cost.In this paper,the wind turbine was used to establish a model using Bladed,and the ultimate load and equivalent fatigue load at the top position of the tower were calculated and output as the design load.Then,the parameters of the tower are optimized with the aim of minimizing the cost.(1)The model of a 1.5MW wind turbine was built with Bladed,16 load conditions were simulated,and the ultimate load and equivalent fatigue load on the top of the tower were calculated and obtained.(2)In this paper,based on the open-source evolutionary algorithm toolbox Geatpy,a tower optimization design script is written based on the differential evolutionary algorithm.Constraints are established on the internal force,stability,fatigue strength of each section of the tower,and the displacement and frequency geometry of the tower structure to achieve constrained optimization of the key parameters of the combined tower.(3)For the prestressed concrete-steel combination tower,the optimization process was designed using a differential evolutionary algorithm.The optimization results found that the cost of this tower is the lowest when the ratio of the steel tower section to concrete tower section is 1:2.27.Compared with the original steel tower,the weight is only 8.6% higher,but the amount of steel used is 73.9% lower,and the total material cost is 69.7% lower,so the optimization effect is remarkable.(4)The stability of the steel section of the combined structure tower was checked and the results showed that the overall stability and local stability of the steel tower section under the ultimate load is good and no stability damage will occur.At the same time,the fatigue test results show that the tower structure meets the fatigue safety requirements.(5)The finite element model of the combined tower was established using the finite element software ABAQUS,and the self-oscillation frequency and vibration pattern of the tower were obtained.The ultimate load on the top of the tower and the wind load on the tower were applied separately to analyze the response of the tower of this combined structure,which proved the safe and effective bearing capacity of the structure.