Abstract
The current article describes the conceptual design of a rotor for a 5 MW machine situated at an offshore site in China (OffWindChina). The OffWindChina 5 MW rotor design work was divided into two parts between the Technical University of Denmark (DTU) and the Chong Qing University (CQU). The two parts consist of the aeroelastic and structural design phases. The aeroelastic part determines the optimal outer blade shape in terms of cost of energy (COE), while the structural part determines the internal laminate layup to achieve a minimum blade mass. Each part is performed sequentially using in-house optimization tools developed at DTU and CQU. The designed blade yields a high energy output while maintaining the structural feasibility with respect to international standards.
Highlights
China is the largest overall wind energy market in the world since 2009 [1]
For more detailed characteristics about offshore wind energy, the reader is referred to the publications [9,10,11]
The wind turbine rotor is to be designed for an offshore site on the southeastern coast of China near the city of Shanghai and Jiangsu Province
Summary
China is the largest overall wind energy market in the world since 2009 [1]. In 2015, China added 30.8 GW of new wind power capacity to the grid, the highest annual added capacity for any country [2]. Fuglsang and Thomsen [17] optimized 1.5–2.0 MW stall-regulated wind turbines with the aim of minimum COE and considered the load cases including the normal production and a fault condition (error in the yawing mechanism) They only optimized the overall wind turbine parameters, such as rotor diameter, rated power and hub height, etc. The current article is organized as follows: first, the aeroelastic component of the blade design is presented, which includes a description of the wind site data, optimization problem, numerical tools and results. This part is used to determine the optimal outer blade shape in terms of COE, with a simple structural design tool.
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