A single-tube open-circuit fault detection method for floating interleaved converters
A technology of open-circuit fault and detection method, which is applied in the direction of instruments, measuring electronics, and measuring devices. It can solve the problems of high current sampling frequency, high recognition accuracy, and increased fault detection cost, and achieve the effect of simple algorithm and cost reduction
Active Publication Date: 2019-02-26
NORTHWESTERN POLYTECHNICAL UNIV
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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
Method used
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[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.
[0024] The present invention provides a single-tube open-circuit fault detection method based on a four-phase floating-ground interleaved converter, which includes the following steps:
[0025] Step 1: Collect the voltage V across the capacitor C1 , V C2 and converter input and output voltage V in , V out ;
[0026] Step 2: The voltage difference between the two capacitors ΔV=V C2 -V C1 The absolute value of and the set threshold k 1 Compare and judge whether there is an open-circuit fault of the switching tube. When |ΔV|1 When , there is no fault, the fault flag F0 is set to 0, when |ΔV|>k 1 , if there is a fault, the fault flag bit F0 is set to 1, and step 3 is performed;
[0027] Step 3: |ΔV| and the set threshold k 2 For comparison, when |ΔV|2 , when a fault o...
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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...
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IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 皇甫宜耿陈福熙卓生荣
Owner NORTHWESTERN POLYTECHNICAL UNIV