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Method for quantitative evaluation of reliability of markov model switch reluctance motor system

一种开关磁阻电机、马尔科夫模型的技术，应用在电动发电机测试等方向，能够解决忽略故障运行状态、不能满足开关磁阻电机驱动系统可靠性分析等问题

Active Publication Date: 2014-05-21
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Therefore, even if a certain component of the system fails, as long as the performance parameters of the system are within the allowable range, the system can continue to operate, and the system failure cannot be identified solely
This excellent fault-tolerant performance introduces a new problem to the reliability research: assuming that the system continues to operate after a certain unit of the system fails, if a second-level failure occurs at this time, what impact will it have on the operation of the system, and what will happen to the system? How to evaluate the operation status and reliability index of the system after multi-level failure
The traditional modeling method based on the reliability block diagram simplifies the operating state of the system into "normal state" and "fault state", and ignores the "fault operating state" of the system, which cannot meet the requirements of reliability analysis of the switched reluctance motor drive system

Method used

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  • Method for quantitative evaluation of reliability of markov model switch reluctance motor system
  • Method for quantitative evaluation of reliability of markov model switch reluctance motor system
  • Method for quantitative evaluation of reliability of markov model switch reluctance motor system

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the embodiment in the accompanying drawings:

[0018] According to the first-level fault determined by the switched reluctance motor system, as shown in Table 1, for the five survival states in the table, considering the occurrence of a second-level fault, the operating performance of the system under the combination of two fault states is simulated, and the result of the second-level fault is obtained ,As shown in table 2. If any three components in the switched reluctance motor system fail simultaneously, the system fails.

[0019] Table 1 Level 1 faults

[0020] failure mode system status Capacitor open circuit (CK) S (survival state) Capacitor short circuit (CD) F (fault status) One-phase open-phase operation (DP) S (survival state) Conductor short circuit (V ON D) S (survival state) Switch short circuit (VswD) F (fault status) Freewheeling...

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Abstract

Provided is a method for quantitative evaluation of the reliability of a markov model switch reluctance motor system. A state transition diagram of the switch reluctance motor system is adopted to solve a probability matrix P'T(t) of the switch reluctance motor system in any survival status at any moment t, and the sum of elements of the probability matrix P'T(t) in the survival status is calculated to obtain a reliability function R(t). Therefore, the mean working time before failures of the switch reluctance motor system is calculated, the quantitative evaluation of the reliability of the switch reluctance motor system is achieved, and the requirement of reliability analysis of the switch reluctance motor system is met. The method for the quantitative evaluation of the reliability of the markov model switch reluctance motor system has good engineering application value.

Description

technical field [0001] The invention relates to a quantitative evaluation method, in particular to a quantitative evaluation method applicable to the reliability of Markov model switched reluctance motor systems of various types and phase numbers. Background technique [0002] The phases of the main circuit of the power converter of the switched reluctance motor drive system and the magnetic circuits of each phase of the motor body are independent of each other, have strong fault tolerance and reliability, and can continue to operate under certain fault conditions. Therefore, even if a certain component of the system fails, as long as the performance parameters of the system are within the allowable range, the system can continue to operate, and the system failure cannot be identified solely. This excellent fault-tolerant performance introduces a new problem to the reliability research: assuming that the system continues to operate after a certain unit of the system fails, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
Inventor 陈昊王星陈玉香杨欢
Owner CHINA UNIV OF MINING & TECH
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