Research on Passive-based Control of Dynamic Wireless Power Transfer System for Autonomous-rail Train
Mutual inductance changes cause fluctuations in the output power of the dynamic wireless power transfer(DWPT)system for autonom-ous rail trains,affecting the stability and reliability of the system.Traditional linear control strategies exhibit poor dynamic performance and fail to adapt effectively to dynamic wireless power transfer systems.Based on passive control theory,this study proposes a constant power control strategy suitable for the DWPT system of autonomous rail trains,characterized by fast response and strong robustness.The structure of the autonomous-rail train DWPT system is introduced,and the equivalent circuit model of the system is established.The transmission and startup characteristics are analyzed,and the necessary conditions for achieving constant power output of the system are obtained.The EL equation of the DC-DC converter is derived to verify the passivity of the converter.A passive-based controller is designed through energy shaping and virtual damping injection,enabling the system output power to remain constant by controlling the expected value of the current flowing into the second-ary DC-DC converter.In addition,a pre-charging circuit is designed to protect the electrical equipment,utilizing the onboard energy storage device to reverse charge the energy storage elements in the DC-DC converter,preventing excessive transient impulse current during startup.A corresponding simulation model is built in MATLAB/Simulink,and a 300 kW DWPT system experimental platform for autonomous rail trains is established for testing.The simulation and experimental results showed that,compared to traditional control strategies,the proposed passive-based control strategy enables the DWPT system's output power to remain unaffected by mutual inductance fluctuations,maintaining an average power of 298.2 kW.In addition,the pre-charging circuit effectively suppresses inrush currents during startup.These results confirm the validity and cor-rectness of the proposed control strategy,highlighting its advantages,including fast response speed and strong robustness.
autonomous-rail traindynamic wireless power transferpassive-based controlconstant power output
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