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Chen Q.,Zhejiang Windey Engineering Co. | Weng H.,Zhejiang Windey Engineering Co. | Wu C.,Zhejiang Institute of Mechanical and Electrical Engineering
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2015

The fatigue damage of hub of MW level wind turbine was studied based on finite element model for the hub of wind turbine. Dynamic fatigue load spectrums were calculated by applying the blade element momentum theory. S-N curve was calculated. according to the mechanical material properties, Analysis showed that the multi-mean S-N curve can be used to mean stress correct. And the critical plane fatigue damage model was more suitable for the variation of principal stress direction. The fatigue damage of the hub of MW level wind turbine was calculated and the fatigue analysis methods with more practical value in engineering application were achieved. ©, 2015, Science Press. All right reserved.


Weng H.,Zhejiang Windey Engineering Co. | Chen Q.,Zhejiang Windey Engineering Co.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2013

The fatigue load of wind turbines was calculated by applying the blade element momentum (BEM) theory, thus the fatigue load history at the hub center was obtained. Then according to the S-N curve and the stress results of FEA, the fatigue analysis method was studied for the wind turbine shaft. And the analysis method for stress-strain response also was instructed. Final, according to different surface roughness and stress concentration, the fatigue damage in different parts of the shaft was calculated. The fatigue analysis method with more practical value in engineering application was achieved.


Luo P.,Hangzhou Dianzi University | Xu Y.,Hangzhou Dianzi University | Yao L.,Zhejiang University | Lou Y.,Zhejiang Windey Engineering Co.
Proceedings - 2010 6th International Conference on Natural Computation, ICNC 2010 | Year: 2010

An improved Particle Swarm Optimization (IPSO) algorithm is proposed in this paper. In the algorithm, a premature estimate mechanism is introduced to judge whether the particles accumulate in a small region and tell the probability whether the swarm is trapped in a local optimum. If the estimate criterion is satisfied, the chaotic mutation operation, which makes use of the chaos search strategy and the "uphill" movement of Simulated Annealing algorithm, is performed to increase the diversity of the swarm and to guide the algorithm to escape from the local optimum. Simulation results show that the searching properties including searching efficiency, precision and robustness of IPSO algorithm are obviously better than that of the standard PSO(SPSO) algorithm. © 2010 IEEE.


Ying Y.,Zhejiang Windey Engineering Co. | Xu G.,Zhejiang Windey Engineering Co. | Pan D.,Zhejiang Windey Engineering Co. | Ye H.,Zhejiang Windey Engineering Co.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2011

Based on the analysis of simple wind turbines model, the motion equations for the drivetrain and output equation were deduced. The time-varying system that depends on the blade azimuth angles was transformed to a purely time-invariant linear system using the Coleman transform. And an individual pitch control strategy that composed of three individual control loops was put forward. Simulation study of the individual pitch control strategy using GH Bladed software was developed. The simulation verifies result show that individual pitch control not only can control generator speed, but also the loads on pitch bearing, drivetrain, hub, yaw bearing and tower can be reduced.


Lu Z.-Q.,Zhejiang Windey Engineering Co. | Xu G.-D.,Zhejiang Windey Engineering Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2010

Taking 1.5 MW doubly fed wind turbine as the research object, the calculation method of stator transient current and rotor transient current of as grid three-phase short circuit fault occurs is presented through analyzing the transient equations. Model of doubly fed wind turbine connected to grid is built, and simulation experiment of grid three-phase short circuit fault is carried out. The simulation results prove the feasibility of transient response calculation method. Then the function of Crowbar circuit for doubly fed wind turbine is studied through theoretical analysis and simulation experiment, and the results show that the transient response of wind turbine generators is improved after adopting the Crowbar circuit.

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