Sensor Disturbance Compensation-based Power Converter Fault Detect Method

Aiming at the problem that the detection accuracy decreases due to inaccurate measured data caused by sensor disturbances in the detection process of the open-circuit fault diagnosis method, this paper proposes an open-circuit fault detection method for converters based on sensor disturbance compensation. This method realizes the preliminary detection of open-circuit faults by establishing a DC voltage observer model and fault characteristic function. Based on the H∞ theory, a sensor measurement observer is designed, a disturbance characteristic function is constructed for disturbance detection and location. A disturbance compensation link is introduced into the original fault characteristic function to achieve accurate and robust detection. The method verification and comparative analysis are carried out on the MATLAB/Simulink simulation platform.