Research On Tuning Control Strategy Of Underwater MC-WPT System

Magnetic coupled wireless power transfer technology(MC-WPT)is a wireless charging technology that uses a magnetic field as an energy medium to transfer electrical energy.It has inherent advantages in the application of some special environments such as underwater environment.The core of the MC-WPT system energy transmission is the magnetic coupling mechanism.In complex underwater environments,the self-inductance and mutual inductance parameters of the magnetic coupling mechanism are prone to change,resulting in changes in the system resonance state and affecting the normal transmission of system power.This article combines the characteristics of the underwater application environment,aiming to adjust the system’s resonance state quickly and accurately when the system’s resonance state changes to varying degrees,so that the system can always maintain the normal resonance state and continuously and stably transmit energy.This paper first analyzes the effect of the underwater environment on the parameters of the coupling mechanism of the system in conjunction with the reluctance model of coupling mechanism,and further discusses the influence of the parameters of the coupling mechanism on the resonance state of the LCC-S topology.Secondly,combined with the particularity of the phase-shift voltage regulation control,a resonance determination method under the phase-shift voltage regulation control is proposed,and the frequency modulation tuning control strategy based on this resonance determination method is further given.Due to the complex coupling characteristics and nonlinearity of the MC-WPT system,this paper performs tuning control to the system based on a fuzzy algorithm that does not require accurate mathematical modeling.In the case of different coupling mechanism parameter changes,by analyzing the dynamic relationship between the system operating frequency and phase difference,the appropriate input and output variables of the fuzzy controller are selected,as well as the design of each variable membership function and development of control rule table to achieve frequency tracking tuning control of the system.According to the above-mentioned tuning control method,this paper establishes a simulation model on the Matlab/Simulink platform,and performs tuning control simulation under different coupling mechanism parameter changes,which verifies the feasibility of the theoretical method.