Graphene Film Combined With FBG Sensor For Icing Monitoring And De-icing Of Wind Turbine

With the increasing attention of environmental protection and the continuous development of wind energy based on clean energy,the installation of wind turbines has been increasing year by year.At the same time,wind turbine icing in cold regions has become a critical issue.Icing leads to vibration increase and produces noise,which influences the blade aerodynamic characteristics,causing power losses,and seriously threat housing and personal safety.Therefore,it has become an important issue whether the ice can be effectively monitored and deiced.In order to monitor the ice accumulation simultaniously and remove the ice in a short time,a graphene film combined with FBG sensor for icing monitoring and deicing of wind turbine technique is proposed in this paper.Main contents are included as follows:A graphene film combined with FBG sensors for icing monitoring and deicing technique is designed for the structure of wind turbine.By making full use of the excellent heat transfer characteristics of graphene and the high sensitivity of FBG sensor,a composite film is combined by FBG sensor and graphene film,and the electrothermal properties of the composite film are analyzed through experiments.Combining with an extra interrogator and power supply,an icing monitoring and de-icing system is built.FBG sensors are used to monitor the temperature changes during freezing process and determine the freezing point,and then the graphene film is heated to achieve efficient de-icing.Theory analysis is carried out based on the ice melting principle.By using ANSYS finite element software simulation,the temperature field of ice melting is simulated,the temperature curve in the process of phase change is analyzed,and various ambient temperature and position factors are discussed.The icing and de-icing test of the icing monitoring and de-icing system is carried out in laboratory test and real environment monitoring respectively.When the temperature is under control,the physical properties of the composite film are explored,wavelengths are plot to compare temperature curves of different points,the freezing rate under various ambient temperature and the melting rate of speed under different heating power.Then compared with ANSYS modeling results,the accuracy of the system under ambient temperatures and heating rates in icing monitoring and de-icing is verified.When the temperature is uncontrollable,the wavelength drift under different ice thickness caused by freezing effect is discussed,and the standard of icing signal and reference value of ice melting power for outdoor monitoring are presented.