Abstract
The purpose of this paper is to explore the effect of the baseline control system (BCS) on the fragility of large‐scale wind turbine when seismic and wind actions are considered simultaneously. The BCS is used to control the power output by regulating rotor speed and blade‐pitch angle in real time. In this study, the fragility analysis was performed and compared between two models using different peak ground acceleration, wind speeds, and specified critical levels. The fragility curves with different wind conditions are obtained using the multiple stripe analysis (MSA) method. The calculation results show that the probability of exceedance specified critical level increases as the wind speed increases in model 1 without considering BCS, while does not have an obvious change in the below‐rated wind speed range and has a significant decrease in the above‐rated wind speed range in model 2 with considering BCS. The comparison depicts that if the BCS is neglected, the fragility of large‐scale wind turbine will be underestimated in around the cut‐in wind speed range and overestimated in the over‐rated wind speed range. It is concluded that the BCS has a great effect on the fragility especially within the operating conditions when the rated wind speed is exceeded, and it should be considered when estimating the fragility of wind turbine subjected to the interaction of seismic and aerodynamic loads.
Highlights
Wind energy has been a mainstream option for electrical generation because of the continuing exhaustion of fossil fuel and the development of wind turbines, which causes the construction of wind turbines in seismically active areas, such as North America, Japan, and China [1]. us, modern wind turbines with large slenderness ratio and flexibility are vulnerable to coupling excitation of seismic and aerodynamic loads, and the International Electrotechnical Commission (IEC) 61400-1 [2] states that the earthquake shaking should be superposed with operational loading in seismically action regions
The rotor speed and blade-pitch angle are regulated in real time according to baseline control system (BCS) for modern large-scale wind turbines. erefore, it is important to consider the BCS when accurately researching the dynamic responses of wind turbines with normal operating conditions
Asareh and Volz [24] used FEM to assess the structural dynamic responses of wind turbines subjected to earthquake and aerodynamic loads and concluded that the pitch control system significantly affects the drag and lift forces applied on blades
Summary
Received 8 September 2019; Revised 5 February 2020; Accepted 18 February 2020; Published 16 April 2020. E purpose of this paper is to explore the effect of the baseline control system (BCS) on the fragility of large-scale wind turbine when seismic and wind actions are considered simultaneously. The fragility analysis was performed and compared between two models using different peak ground acceleration, wind speeds, and specified critical levels. E calculation results show that the probability of exceedance specified critical level increases as the wind speed increases in model 1 without considering BCS, while does not have an obvious change in the below-rated wind speed range and has a significant decrease in the above-rated wind speed range in model 2 with considering BCS. It is concluded that the BCS has a great effect on the fragility especially within the operating conditions when the rated wind speed is exceeded, and it should be considered when estimating the fragility of wind turbine subjected to the interaction of seismic and aerodynamic loads
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