A Fault Detection and Identification Method Based on Mixed Logic Dynamic Model for Three-phase Inverter Using Single Current Sensor

摘要

A fault detection and identification (FDI) method based on mixed logic dynamic(MLD) model for three-phase inverter using single current sensor is proposed in this paper. Single current sensor is used to measure and reconstruct the output currents of a three-phase inverter. A MLD model of the inverter is further established to estimate the output current in real-time under different fault conditions. The estimated currents and the measured currents can be compared and residuals between them can also be calculated in real-time to detect and locate the faults. Compared with existing FDI methods, method proposed in this paper can reduce the uncertainty brought by current sensors by using single current sensor, and improve the accuracy of fault diagnosis by using mixed logic model of the inverter. Simulation results show the effectiveness of the FDI method.