Research On Modeling Method Of Metallized Film Capacitor Based On Electrothermal Field Coupling

At the core of new energy power production and adaptable DC transmission lies converter valves.Dry-type DC capacitors,as the core components of converter valves,directly affect the quality and safety of power conversion.Most of the dry DC capacitors currently in use use a core formed by winding metallized films.Such Metallized Film Capacitors(MFC)have the characteristics of self-healing,good temperature characteristics,and superior safety performance.The aging and failure of DC support capacitors on the core component Modular Multilevel Converter(MMC)due to heat,a common occurrence in the field of flexible DC power transmission,has a significant effect on the drive’s performance.Power density,thermal performance,device utilization and safety performance.Through the thermal simulation software based on the finite element method,the heating simulation of the MFC is carried out,and the heating law and temperature distribution of the capacitor work are grasped,which is very important for further improving the physical structure of the capacitor,material selection and increasing the actual service life of the capacitor.guiding significance.In this context,this paper mainly studies the modeling method of metallized film capacitors based on electrothermal field coupling.1.Aiming at the relevant conditions associated with the operation of the capacitor,this paper analyzes and studies two related physical fields: an examination of the two electric and thermal fields is conducted,followed by a discourse on the correlation between the electric field and the thermal field,which is based on the physical parameters and equations associated with them.The finite element concept and the finite element analysis procedure,primarily employed in ANSYS Workbench’s electrothermal analysis,is also presented.The ANSYS Workbench software is employed to implement the thermal field and electric field analysis equations of film capacitors,which this paper concentrates on.To furnish guidance and reference for the subsequent electrothermal examination research.2.Simulation software is employed to ascertain the physical model of the metallized film capacitor product,as determined by research on MFC.The finite element method analyze is employed to simulate the creation of both the physical and appearance models.By contrasting the experimental test and simulation outcomes,the disparity between the manufactured model and the actual circumstances is examined,and the correctness and dependability of the established capacitor model is confirmed.In order to explore the design commonality and differences of MFC and other large capacitance devices such as high-voltage AC power capacitors,it provides personalized modeling and simulation analysis.3.Further use the established computer model,on the basis of determining the authenticity and reliability of the model,explore the heat generation of the new thin film material as the medium through computer simulation,and study the heat generation under different current frequencies,including high-frequency current and low-frequency current.Under the influence of harmonics,the heat production of MFC,the influence of the thermal conductivity of filling materials on the temperature rise of capacitor products,and the simulation of two issues of concern to the capacitor manufacturing industry were studied,and the impact of these issues on thermal design and solution.