| With the advancement of the electrical age,wireless energy transmission technology is more and more valued by researchers due to its safety,reliability and flexibility.Inductively coupled power transmission(ICPT)is the main transmission method of wireless power transmission technology.It has the characteristics of high transmission efficiency,large transmission power,and stable transmission.In order to solve the need for high-power transmission and take into consideration the influence of factors such as the power capacity and price of semiconductor devices in the circuit,when ICPT technology is applied in the field of transportation,double pickup coils can be used in parallel to provide energy to the load to increase the transmission power of the system.Due to the special application scenario of the dual pickups ICPT system in the mobile state,its magnetic flux leakage is greater than that of the dual pickups ICPT in the static state,which causes the transmission power and transmission efficiency of the system to decrease.In addition,during the movement process,the output voltage of the system will be unstable due to changes in the coupling coefficient and load parameters.Therefore,parameter optimization and voltage stabilization control have important theoretical and practical significance for the application of mobile dual pickups ICPT systems in the high-power field.This thesis mainly researches two aspects of parameter optimization and voltage stabilization control of mobile dual pickups ICPT system.First,the characteristics analysis and comparison of the four basic compensation networks and LCL compensation networks of the ICPT system are made,and it is concluded that the LCL compensation network is more suitable for mobile scenarios where the load changes.Based on the analysis and simulation of the transmission characteristics of the mobile dual pickups ICPT system,a mobile dual pickups ICPT system based on the LCL compensation network is designed.In terms of parameter optimization,a nonlinear programming mathematical model of a mobile dual pickups ICPT system based on the LCL compensation network is established.The multi-objective particle swarm algorithm is used to optimize the system's output power and transmission efficiency.Then the parameters of the optimized resonant network are obtained.And the optimized parameters are compared with the comparison parameters in the simulation software.In terms of voltage regulation control,because the mobile dual pickups ICPT system has the characteristics of large output voltage variation and the signal is easily interfered during the movement,the method of adding a Buck-boost circuit on the secondary side is used to regulate the output voltage.Based on the establishment of a small-signal model of the Buck-boost circuit,a proportional-integral-derivative(PID)controller and a fuzzy PID controller are designed.In Matlab software,the voltage stabilization effect of the mobile dual pickups ICPT system controlled by PID and the mobile dual pickups ICPT system controlled by fuzzy PID are compared.The optimized parameters and comparison parameters are simulated and compared in PSpice software.It was found that the mobile dual pickups ICPT system with optimized parameters can transmit more power at the same time as more efficient transmission,which verified the effectiveness of parameter optimization.By comparing the voltage stabilization control results obtained by the two control methods in Matlab software,it is found that the system using fuzzy PID control has faster response speed and smaller overshoot,which verifies the effectiveness of the fuzzy PID controller voltage stabilization control. |
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