Research On Parameter Identification And Control Simulation Of Inductively Coupled Power Transfer System

Inductively coupled power transfer technology which referred to ICPT technology is a novel power transfer technology. ICPT technology has realized contactless power transmission by building energy transmission channel between the power equipment and electrical equipment though high frequency magnetic field. This technology has achieved rapid development with its advantages of high reliability,high safety and low cost.The LCL complex resonance type ICPT system can produce bigger resonance capacity than the traditional single-stage LC resonance type ICPT system. At the same power, the voltage and current stress with the switch of the LCL type ICPT system will be smaller. Therefore, the LCL complex resonance type ICPT system is chosen as the research object.At the beginning of this paper, the structure and model of LCL complex resonance type ICPT system will be analyzed. The working principle of the system is introduced. Constant current and filtering properties of the LCL complex resonance network, voltage gain and power characteristics of the system are analyzed later. And the model simulation is used to verifying the correctness of the established system state space.Then the parameters of the LCL type ICPT system are identified. The parameter identification problem is converted into an optimization problem. Considering the disadvantage of the particle swarm algorithm, chaos theory is introduced to improve the particle swarm algorithm. The improved algorithm is used for the parameter identification. The chaos particle swarm algorithm uses the random characteristics of the particle swarm algorithm during the initialization of particles and ergodicity for chaotic motion. And the system parameters are identified through the MATLAB simulations.During the actual operation of the ICPT system, the system output voltage will be unstable with the change of load and the distance between the primary coil and the secondary coil. As these change will affect the power supply quality and the stability of the system. And the LCL type ICPT system is high order nonlinear and uncertain.So it is necessary to design a control strategy with the strong robustness to ensure the system stability. For the output control problem of ICPT system, the output voltagecontrol strategy based on self-tuning fuzzy control is designed. And the effectiveness of the control method is verified through the simulations.Finally, the ICPT system primary side constant current control strategy is researched for mobile multiple load type. Aiming at the primary side current control problem of multiple load system caused by the change of loads, ICPT system primary current control strategy based on fuzzy PID controller is designed to keep the primary side current constant. This primary current control strategy can keep each secondary coil induced voltage constant and make each secondary side load independent and stable operation. And the feasibility of the control method is verified through the simulations.