Research on Dynamic Modeling and Fault-Tolerant Control of IPT System for Intelligent Ship Wireless Charging

Aiming at the problems of intelligent ship inductive power transfer (IPT) systems under complex marine operating conditions, such as susceptibility to parameter perturbations and power device faults, which result in low modeling accuracy, slow dynamic response and poor post-fault stability, this paper investigates an integrated full-system fault diagnosis and hierarchical fault-tolerant control strategy. Based on the complex Fourier series and generalized state-space averaging (GSSA) method, a complete nonlinear time-domain model of the IPT system is established. The high-order switching-coupled system is accurately reduced to a first-order dominant model, and the inherent over-damping characteristics of the system as well as the influence rules of relevant parameters are clarified. A PI closed-loop regulation strategy is designed, and the trade-off mechanism of proportional integral parameters regarding steady-state accuracy, response speed and fault robustness is revealed. Comparative theoretical analysis and simulation results verify that the established model is highly consistent with the dynamic characteristics of the practical system, with the steady-state error controlled within 2%. Under the open-circuit fault of power switches, the system can still maintain stable output current without instability or sharp current drop, demonstrating excellent fault tolerance. The research findings provide a theoretical basis and technical support for high-precision modeling, parameter tuning and the safe and reliable operation of wireless charging systems for intelligent ships.