A single-tube open-circuit fault detection method for floating interleaved converters

Abstract

The invention provides a floating ground interleaved converter single tube open circuit fault detection method. According to the method, voltages of two ends of two capacitors of a four-phase floating ground interleaved Boost converter are acquired, and a voltage difference value of the two capacitors is compared with set thresholds; low level driving is respectively applied to switch tubes S1 and S3, and voltage difference of two ends of the capacitors C1 and C2 before and after applying low level driving is respectively acquired and is compared with the set thresholds. According to the method, fault detection on open circuit faults of one single switch tube of the four-phase floating ground interleaved Boost converter can be realized, and the specific switch tube in fault can be precisely positioned. The method is advantaged in that the method is simple and easy to realize, extra hardware is not needed to add, and fault detection cost is reduced.

Description

technical field [0001] The invention relates to a fault detection method for a switch tube of a converter, in particular to a single-tube open-circuit fault detection method for a four-phase floating-ground interleaved Boost converter. Background technique [0002] In the context of the increasingly scarce fossil energy, the development of renewable and clean energy and the use of advanced and efficient energy utilization technologies have become the priority development strategies of various countries. Solar photovoltaics and fuel cells are considered to be the most potential new energy sources, especially fuel cells, which have become a research hotspot because of their high efficiency, low noise and no pollution. Whether it is solar photovoltaic or fuel cell, the output is low-voltage and high-current direct current, and the output voltage changes with the load disturbance, and the volt-ampere characteristics show obvious nonlinearity. Therefore, it is necessary to adjus...

AI Technical Summary

Problems solved by technology

The above fault detection and fault diagnosis principles have two major defects: one is that the current sampling frequency is too high; the other is that the accuracy of fault diagnosis depends largely on the size of the ripple, the larger the ripple, the higher the recognition accuracy

But for fuel cell applications, excessive ripple will cause damage to the fuel cell stack and affect its life

[0004] To sum up, the existing literature and patents often need to use auxiliary devices or sensors when detecting the fault of the converter switching tube, which increases the cost of fault detection

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