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Modeling and Analyzing Dynamic Response for An Offshore Bottom-Fixed Wind Turbine with Individual Pitch Control

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Abstract

The asymmetric or periodically varying blade loads resulted by wind shear become more significant as the blade length is increased to capture more wind power. Additionally, compared with the onshore wind turbines, their offshore counterparts are subjected to additional wave loadings in addition to wind loadings within their lifetime. Therefore, vibration control and fatigue load mitigation are crucial for safe operation of large-scale offshore wind turbines. In view of this, a multi-body model of an offshore bottom-fixed wind turbine including a detailed drivetrain is established in this paper. Then, an individual pitch controller (IPC) is designed using disturbance accommodating control. State feedback is used to add damping in flexible modes of concern, and a state estimator is designed to predict unmeasured signals. Continued, a coupled aero-hydro-servo-elastic model is constructed. Based on this coupled model, the load reduction effect of IPC and the dynamic responses of the drivetrain are investigated. The results showed that the designed IPC can effectively reduce the structural loads of the wind turbine while stabilizing the turbine power output. Moreover, it is found that the drivetrain dynamic responses are improved under IPC.

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Funding

This paper is financially supported by the Scientific Research Foundation of Chongqing University of Technology (Grant Nos. 2020ZDZ023 and 2019ZD124), the Project of Science and Technology Research Program of Chongqing Education Commission of China (Grant No. KJQN202101133), and the National Natural Science Foundation Cultivation Program of Chongqing University of Technology (Grant No. 2021PYZ14).

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Authors and Affiliations

  1. College of Mechanical Engineering, Chongqing University of Technology, Chongqing, 400044, China

    Shuang-yi Xie & Kai-fei Zhang

  2. School of Mechanical and Power Engineering, Chongqing University of Science & Technology, Chongqing, 401331, China

    Jiao He

  3. Beijing Institute of Precision Mechatronics and Controls, Beijing, 100076, China

    Jian Gao

  4. Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Sciences, Shanghai, 200092, China

    Cheng-lin Zhang

  5. College of Engineering Science and Technology, Shanghai Ocean University, Shanghai, 201306, China

    Cheng-lin Zhang

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  1. Shuang-yi Xie
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  2. Kai-fei Zhang
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  4. Jian Gao
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  5. Cheng-lin Zhang
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Correspondence to Kai-fei Zhang.

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Xie, Sy., Zhang, Kf., He, J. et al. Modeling and Analyzing Dynamic Response for An Offshore Bottom-Fixed Wind Turbine with Individual Pitch Control. China Ocean Eng 36, 372–383 (2022). https://doi.org/10.1007/s13344-022-0033-8

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  • DOI: https://doi.org/10.1007/s13344-022-0033-8

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