Optimization Of Coupler In Wireless Power Transfer System Based On The Rule Of Trams Parking Error

Modern tram with its features of moderate traffic volume,energy saving,short construction period and other advantages,has been got a wide range of construction and application in cities around the world.The traditional power supply mode can not fully meet the need of the development trend.WPT(Wireless Power Transfer)technology is a new mode of power supply with high safety,intelligence and automation.It meets the electrification trend of railway transportation and has been extensively studied.As an important component of WPT,the weight and efficiency of the coupler determine the performance of the system to a great extent,and then determine its future development.For the modern tram parking error characteristics,the optimization of coupler with shielding layer in WPT system was studied.Through reasonable design,accurate modeling and optimization strategy of coupler,the overall optimization of the efficiency and weight of the coupler is achieved.The experimental results verify the correctness of the optimization scheme.Firstly,model for the coupler,compensation topology and circuit of WPT system were established;The relationship between the structure parameters and the system output power and efficiency was analyzed based on the effect of coupler parameters while considering the compensation of capacitor voltage stress;the coupler installed on the tram was studied through simulation software,which leads to the necessity of adding shielding layer to the coupler.Secondly,the advantages,disadvantages and application of the different electromagnetic analysis methods were compared,and the numerical analysis method has a great advantage in multi-parameter modeling and optimization.The coupler with shielding layer was modeled using the Maxwell equations.Material properties of the shielding layer,misalignment characteristics and shape characteristics were studied in order to guide the design and optimization of coupler.Then the comprehensive optimization objective and design strategy were proposed based on the efficiency expectation and weight.The calculation method of the objective function,the constraint conditions and optimization strategy of coupler with shielding layer were elaborated.Using the optimization process,the different couplers were optimized,and the couplers using traditional optimization objective were compared with the proposed one.The results show that the coupler using comprehensive optimization objective and optimization strategy,its misalignment tolerance and efficiency expectation was improved.The eddy current loss of the car body was reduced and the magnetic shielding function was realized.Finally,the optimized couplers are made,and the experiment was carried out in the WPT experimental platform.This paper mainly includes,it mainly includes the characteristics of distance between the coupler and magnetic materials,the verification of the misaligenment characteristics of the coupler,the verification of the efficiency at misalignment under the optimal load control.The experimental results verify the correctness of the modeling and optimization strategy.