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Cophase power supply system flow controller dynamic reliability evaluating method

A technology of power flow controller and power supply system, which is applied to AC networks, instruments, electrical components and other directions of the same frequency with different sources, can solve problems such as difficulty in reflecting the influence of material fatigue characteristics and reliability, and achieve universal applicability, Evaluate the results accurately and optimize the effect of cascades

Active Publication Date: 2017-12-22
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

At present, the reliability manual of power electronic equipment is mainly used to evaluate the reliability of high-power power electronic components. This evaluation method only analyzes the failure rate distribution of power components under rated operating conditions, and it is difficult to reflect the internal power components under load fluctuations. Material Fatigue Characteristics and Its Influence on Reliability

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  • Cophase power supply system flow controller dynamic reliability evaluating method
  • Cophase power supply system flow controller dynamic reliability evaluating method
  • Cophase power supply system flow controller dynamic reliability evaluating method

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Embodiment Construction

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0049]The core issue of evaluating PFC reliability is the calculation of IGBT power module failure rate and the construction of PFC reliability model. The main reason for the failure of the IGBT power module is the package failure caused by the thermal cycle shock caused by the random fluctuation of the traction load. The failure rate of the IGBT power module should be calculated from the failure mechanism, taking into account the characteristics of the traction load; based on the converter topology adopted by PFC Structure and operation mode, the present invention analyzes the redundancy of the power module, optimizes the number of cascaded modules of the power flow controller, and provides a necessary basis for the engineering design and operation and maintenance of the same-phase power supply system. Such as figure 2 Shown, the p...

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Abstract

The invention discloses a cophase power supply system flow controller dynamic reliability evaluating method. The influence of the actual traction load randomness and impact on the junction temperature fluctuation of a power element is taken into account. Power loss and a thermal network model are used to calculate the junction temperature of the power element. A physical model based on a failure mechanism and a linear fatigue damage cumulative model are combined to calculate the power module failure rate of a flow controller. The PFC reliability is analyzed by using a dynamic reliability assessment method which takes into account the variation of the element failure rate. According to the invention, the redundancy of a power module is analyzed; the number of cascaded modules of the flow controller is optimized; and a necessary basis is provided for engineering design and operation maintenance of a cophase power supply system.

Description

technical field [0001] The invention relates to the field of reliability evaluation of a power flow controller of a co-phase power supply system, in particular to a method for dynamically evaluating the reliability of a power flow controller of a co-phase power supply system. Background technique [0002] The power frequency single-phase AC system is commonly used in electrified railways, which has caused power quality problems and excessive phase problems mainly caused by negative sequence. The current in-phase power supply technology based on symmetrical compensation theory and high-voltage large-capacity PFC is an ideal method to solve the above problems. As the core component of the same-phase power supply device, the reliable operation of PFC has attracted much attention. Therefore, the reliability evaluation and optimal design of PFC are also the key to the research and engineering application of co-phase power supply technology. [0003] The failure of PFC based on ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/06G06Q50/06
CPCG06Q50/06H02J3/00H02J3/06H02J2203/20
Inventor 陈民武宋雅琳智慧周应东朱远帆冯祥刘若飞
Owner SOUTHWEST JIAOTONG UNIV
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