Open-Circuit Fault Diagnosis and Fault-Tolerent Control Strategies for Interleaved Boost Converter

This paper addresses an open circuit fault (OCF) diagnosis method and a fault-tolerant control for a non-isolated interleaved boost converter to optimize reliability. The studied structure is based on interleaved boost converter ensuring maximum power operation and a full bridge converter allowing the regulation of the battery voltage. Unlike several other works in the literature which are generally based on the inductor current or the slope of this current, the proposed method is based on the measurement of the inductor voltage in addition to the diode and switch voltages. To generalize, the detection principle is applied to the others phases of the interleaved dc-dc converter. Once the open switch failure position is detected, a reconfiguration is established allowing the interleaved dc-dc boost converter to continue to operate using the three phases and replacing the faulty switch with arm of the full bridge converter. The major advantage of the proposed method is its simplicity of implementation in addition this method does not require any additional switch to ensure reconfiguration. The proposed method is implemented in MATLAB/Simulink and the obtained results are discussed. The simulation result shows the validity of the theoretical analysis. The proposed fault-tolerant control strategy optimizes the performance of the interleaved boost converter in terms of cost, reliability and service continuity.