Research On Dynamic Modeling And Robust H_? Guaranteed Cost Control Of Double Pickup ICPT System

The inductively coupled power transfer(ICPT)system based on the principle of electromagnetic induction,high-power high-frequency inverter technology and resonance compensation technology,as a non-contact power supply method,gets rid of various disadvantages brought by traditional contact power supply.In the field of non-contact traction power supply with high-power power supply occasions such as rail traction power supply as the application background,the ICPT system with a single pick-up coil on the secondary side cannot meet the requirements of high-power output,and the double pick-up coils can better improve the transmission characteristics of the system and are more suitable for applications with high-power output requirements.The double pick-up ICPT system must ensure the stability of the output power while increasing the output power,and the stability of the output voltage across the load is an important prerequisite for ensuring the stability of the output power.Although the addition of the resonance compensation network in the system can achieve the stability of the output voltage,it will increase the order of the system,resulting in a highly sensitive system to parameter changes and external disturbances.Studying methods to ensure the robust stability and performance robustness of the double pick-up ICPT system under parameter perturbation and external disturbance has important theoretical and practical significance.In the double pick-up ICPT system,it is possible to add a resonant compensation structure to achieve the constant current of the primary-side transmitting coil and the stable output voltage across the load,but different resonant compensation structures have different applications due to their own characteristics.To this end,the thesis,based on the impedance analysis method,compared and analyzed the constant current and voltage and transmission characteristics of four basic reactive compensation structures and five common hybrid reactive compensation structures,the D-LCL type hybrid reactive compensation structure was selected.Aiming at the problem that the D-LCL compensated double pick-up ICPT system is extremely sensitive to small changes in the inductances of the transmitting coil and the pick-up coils.When the dynamic model of the system was established using the state space method,the uncertainties of the primary and secondary inductances were introduced,furthermore,the uncertain model of the system was obtained,and the nominal module and the uncertain module of the uncertain model were separated to prepare for the control of the dual-pick ICPT system based on the linear matrix inequality.When the D-LCL compensated double pick-up ICPT system is subject to parameter disturbance and external interference,it will reduce the stability of the system output voltage.To solve this problem,the external interference was introduced for the dynamic model,on this basis,the H? robust controller was designed,and the ability of double pick-up ICPT system under H? robust control to suppress parameter disturbance and external disturbance was verified.Aiming at the problem that the H? robust control cannot make the output voltage of the double pick-up ICPT system reach the desired index,the guaranteed cost control strategy was used to design the output feedback guaranteed cost controller to ensure the allowed uncertainties of the inductances of the transmitting coil and the pick-up coils,the output voltage has the desired robust performance.In order to achieve the robust stability and performance robustness of the system under external disturbances and parameter perturbations,the H? robust control and the guaranteed cost control were combined to design a robust H? guaranteed cost controller of the double pick-up ICPT system based on D-LCL compensation.On the MATLAB / Simulink platform,a closed-loop simulation model of the D-LCL compensated double pick-up ICPT system under robust H? guaranteed performance control was built to verify the robust stability and the anti-disturbance capability of the closed-loop system and the ability to track reference input under parameter perturbations.The numerical examples and the simulation results show that the D-LCL compensated double pick-up ICPT based on robust H? guaranteed performance control has very good robust stability and performance robustness under extremely sensitive voltage.The output voltage across the load has good tracking performance for the input square wave signal.