| Mobile Inductively Coupled Power Transmission(ICPT)is a special type of Wireless Power Transmission(WPT).Its transmission process does not require wire contact and secondary side can move along the guide rail along the primary side,which is flexible,convenient,efficient,enabling real-time online charging.It has important engineering significance and practical significance in the fields of electric transportation,electronic products and marine science.However,due to the mobility of the secondary side in Mobile ICPT system,its magnetic flux leakage is more serious than the traditional ICPT system,which results in lower transmission power and lower transmission efficiency.In addition,the Mobile ICPT system is prone to problems such as frequency division,large switching loss and increased output reactive power during operation.This will make the Mobile ICPT system still have many challenges in practical applications.Aiming at the unstable operation of Mobile ICPT system and the low efficiency caused by low coupling coefficient,this dissertation ensures the reliable,safe and efficient operation of the system by compensating reactive power for the coupled coil and optimizing system parameters.Firstly,the basic and composite reactive compensation topologies are analyzed.Then based on different reactive compensation methods,the transmission characteristics of the Mobile ICPT system are analyzed and select the reactive compensation method most suitable for the Mobile ICPT system.Secondly,the TS-S compensation network is selected to establish its mathematical model and the frequency stability constraint is used to correct the system frequency so that the system works stably and reliably.At the same time,the improved Nondominated Sorting Genetic Algorithm Ⅱ(NSGA-Ⅱ)is used to optimize the system resonance parameters to maximize the transmission efficiency of the system.Finally,in order to comprehensively evaluate the influence of various parameters during the system operation,the Mobile ICPT system index evaluation system based on the grey correlation analysis method is established and the influence of each parameter on the system operation is analyzed.The NSGA-Ⅱ algorithm is used to optimize the parameters that have a large impact on the system operation,thus ensuring reliable and efficient operation of the Mobile ICPT system.In this dissertation,the Pspice experimental simulation circuit is built to verify that the composite reactive power compensation topology is more suitable for the Mobile ICPT system.Moreover,both the coupling coefficient and quality factor are positively correlated with the system transmission efficiency;The Matlab simulation platform is used to verify that the NSGA-Ⅱ algorithm can better break through the limitations of local optimal solutions and quickly find the global optimal parameters of the system.After optimization,the voltage and current of each device in the system are within the rated range and the system transmission efficiency can reach 97.2%;Based on the comprehensive index evaluation system of the Mobile ICPT system,the NSGA-Ⅱ algorithm has a significant optimization effect. |
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