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Vehicle-mounted composite power supply reliability evaluation method based on Markov chain and fault tree

A composite power supply and fault tree technology, applied in resources, electrical digital data processing, instruments, etc., can solve the problem that the reliability of vehicle composite power supply is difficult to accurately evaluate, and achieve the effect of avoiding trial and error

Active Publication Date: 2018-10-16
JIANGSU UNIV OF TECH
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Problems solved by technology

[0005] In order to solve the problem that the reliability of vehicle-mounted composite power supply is difficult to be accurately evaluated, the present invention provides a method for evaluating the reliability of vehicle-mounted composite power supply based on Markov chain and fault tree. The method is based on the combination of Markov chain theory and fault tree theory, and establishes Reliability model diagrams of composite power supplies with four different topologies for reliability evaluation

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  • Vehicle-mounted composite power supply reliability evaluation method based on Markov chain and fault tree
  • Vehicle-mounted composite power supply reliability evaluation method based on Markov chain and fault tree
  • Vehicle-mounted composite power supply reliability evaluation method based on Markov chain and fault tree

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] figure 1 It is a schematic diagram of the structure of four different topological structures HESS (hybrid power supply). figure 1 (a) is a cascade structure HESS with supercapacitors in the middle. Compared with the multi-input power converter structure HESS, since the first bidirectional DC / DC power converter 3 is located between the battery 1 and the supercapacitor 2 in this structure, the state of charge (State of charge, SOC) can be controlled individually. In addition, the voltage variation of the supercapacitor 2 depends on the variation of its state of charge, and the second bidirectional DC / DC power converter 4 needs to regulate and stabilize the DC bus voltage. figure 1 (b) is a cascade structure HESS with the battery in the middle. The supercapacitor 2 is connected to the storage battery 1 through the first bidirectional DC / DC power...

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Abstract

The invention discloses a vehicle-mounted composite power supply reliability evaluation method based on Markov chain and fault tree, comprising the following steps of: firstly, establishing a state transition graph when composite power supplies with four different topology structures comprising a cascaded structure composite power supply with a super capacitor located in an intermediate position,a cascaded structure composite power supply with a storage battery located in the intermediate position, a parallel connection structure composite power supply and a multi-input power converter structure composite power supply break down based on Markov chain theory; secondly, according to the state transition graph when the composite power supplies with four different topology structures break down, establishing a fault tree model graph which finally makes the composite power supply break down and the system be in a state of paralysis based on the fault tree theory; finally, according to theestablished fault tree model graph, calculating break down rate of the composite power supplies with four different topology structures, performing comparative analysis, and performing reliability evaluation, so as to obtain a composite power supply with the strongest reliability, and repeated tests in engineering practice are avoided.

Description

technical field [0001] The invention relates to a method for evaluating the reliability of a vehicle-mounted battery and a supercapacitor composite power supply, in particular to a method for evaluating the reliability of a vehicle-mounted composite power supply based on a Markov chain (hereinafter referred to as "Markov chain") and a fault tree. Background technique [0002] Traditional internal combustion engines account for the vast majority of current oil consumption, bringing about a series of problems such as air pollution, greenhouse gas emissions, and global warming. Pure electric vehicles are the inevitable trend of future automobile development. As the basic energy facilities of pure electric vehicles, vehicle electrification has attracted extensive attention from scholars at home and abroad. [0003] Hybrid electric vehicles are the first step towards the globalization of pure electric vehicles. Energy storage components are one of the key components of hybrid ele...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/06G06F17/50
CPCG06Q10/0639G06Q50/06G06F30/18G06F30/20
Inventor 王琪韩晓新沃松林罗印升
Owner JIANGSU UNIV OF TECH
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