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A kind of igbt comprehensive overcurrent protection method and system based on digital filtering

A technology of digital filtering and overcurrent protection, which is applied in the direction of digital technology network, measuring current/voltage, electrical components, etc., can solve the problem of large dispersion of protection action delay, and achieve small action delay dispersion and fast protection action , The effect of reducing hardware costs

Active Publication Date: 2020-08-04
NARI TECH CO LTD +1
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  • Claims
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Problems solved by technology

[0005] Purpose of the invention: To provide a digital filter-based IGBT comprehensive overcurrent protection method to solve the problem of large dispersion of protection action delay in the existing overcurrent protection

Method used

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  • A kind of igbt comprehensive overcurrent protection method and system based on digital filtering
  • A kind of igbt comprehensive overcurrent protection method and system based on digital filtering
  • A kind of igbt comprehensive overcurrent protection method and system based on digital filtering

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Embodiment Construction

[0022] Embodiments of the IGBT comprehensive overcurrent protection method based on digital filtering of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] 1) The function configuration of the IGBT comprehensive overcurrent protection strategy based on digital filtering is as follows: figure 1 Shown:

[0024] The main control unit collects the AC current signal i in real time, the αβ value of the phase-shift filter SPF output current, and calculates the effective value of the current i lp , each calculation cycle compares i lp and the magnitude of the current limit Imax of the IGBT, for 3 consecutive calculation cycles, i lp If it is greater than Imax, set the IGBT blocking flag Blk, otherwise reset the blocking flag Blk, and the main control device transmits Blk to the IGBT drive unit through the optical fiber.

[0025] The driving unit collects the driving voltage Vce in real ...

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Abstract

The invention discloses an IGBT (insulated gate bipolar translator) comprehensive over-current protection method and system based on digital filtering. According to the method, over-current is divided into short circuit over-current protection and system over-current protection according to over-current level, system over-current protection is discriminated by a main control unit, short circuit over-current protection and IGBT turn-off logic are discriminated by a driving unit, and rapid over-current protection of an IGBT is jointly finished by the main control unit and the driving unit. Compared with a current universally-used sampling value transient over-current protection method, the method is rapid in action and small in delay discreteness, a current acquisition circuit and an over-current judging device are not arranged in the driving unit, the size of the driving unit is reduced, and cost is saved.

Description

technical field [0001] This patent relates to the technical field of power electronics, especially an overcurrent protection technology. Background technique [0002] At present, more and more high-power power electronic devices are used, such as converters, static var generators (SVG), active filters (APF), etc. In these devices, the core power electronic devices of the main circuit are all turned off. break device IGBT. [0003] In order to ensure the safety of IGBT devices during the operation of power electronic equipment, IGBT overcurrent protection must be configured. According to the characteristics of IGBT devices, its over-current protection includes short-circuit over-current protection and system over-current protection. System over-current means that the current is greater than the maximum peak current of IGBT, but less than the short-circuit threshold current, while short-circuit over-current means that the current is greater than IGBT. short circuit threshold...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/165H03H17/08
CPCG01R19/16528H03H17/08
Inventor 方存洋施胜丹邹宁刘育鑫牟晓春梁帅奇杨合民
Owner NARI TECH CO LTD
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