Research on Rectifier Fault Diagnosis Method in Wireless Power Transfer Systems Based on Harmonic Analysis

Abstract

Inductive power transfer (IPT) technology has become a research focus due to its convenience, flexibility, and environmental adaptability. However, the high failure rate of power electronic devices in IPT systems poses a significant challenge, with the precise diagnosis and localization of rectifier faults being a critical issue that requires immediate attention. This paper proposes a fault diagnosis method based on harmonic analysis for rectifier short‐circuit faults in IPT systems. Initially, simulations were conducted to analyze the electrical characteristics of faults at different locations and the potential secondary faults they might cause. Subsequently, a mathematical model of the system was established, and the time‐domain expressions of fault characteristics were derived, with their analytical expressions in the frequency domain obtained through Fourier transformation. Based on this, by analyzing the mapping relationship between different fault types and frequency‐domain characteristics, a diagnostic scheme capable of fault type identification and localization was constructed. Finally, an experimental platform was set up to verify the variation patterns of characteristics under single‐diode and dual‐diode short‐circuit faults.