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A reversion subversion protector for three-phase crystal thyratron and full control bridge active reverser

A source inverter and inverter subversion technology, applied in the field of control, can solve problems such as incomplete protection functions, and achieve the effect of strong versatility

Inactive Publication Date: 2008-03-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Description
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AI Technical Summary

Problems solved by technology

[0004] 2) The protection function is not complete
[0007] C) Only protect the inverter subversion caused by the overcurrent fault on the DC side of the active inverter circuit of the single-phase or three-phase thyristor full-control bridge

Method used

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  • A reversion subversion protector for three-phase crystal thyratron and full control bridge active reverser
  • A reversion subversion protector for three-phase crystal thyratron and full control bridge active reverser
  • A reversion subversion protector for three-phase crystal thyratron and full control bridge active reverser

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Embodiment Construction

[0026] The subversion of the inverter refers to the state where the normal working conditions of the inverter are damaged. It includes the straight-through, cut-off, false triggering and loss of triggering of converter faults and so on. From the perspective of the phenomenon, the current cannot be successfully transferred from the conduction valve to the successive valve according to the normal commutation procedure. There are two forms of its manifestation: one is that the fault current passes through two valves connected to one phase of the transformer, that is, single-phase subversion, as shown in Figure 5, and the other is under the simultaneous action of the transformer phase-to-phase voltage and DC voltage , so that both the transformer winding and the DC circuit have a large fault current, that is, the two phases are reversed, as shown in Figure 6.

[0027] The external factors causing the subversion of the inverter include the increase of the DC voltage (corresponding...

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Abstract

The invention relates to an inversion subversion protector of a fully controlled bridge line active inverter by a three-phase thyristor, belonging to the protection technical field, aiming to solve inversion subversion protection problem. The invention has the technical proposal is that the protector comprises a subversion signal detection circuit and an IGBT snap switch connected in the DC circuit of the active inverter in series and equipped with an antiparallel diode, wherein the subversion signal detection circuit comprises a AC voltage detection circuit, a DC overcurrent detection circuit, and an inverter control panel power supply detection circuit, the output signals thereof are used for controlling the on-off of the IGBT after being calculated and be amplified, and the enabled terminal of an OR gate is connected with the charging / discharging signal of the inverter control panel. The invention has the advantages of high commonality, suitability to be made into standard element, and complete protection functions; and can carry out effective and reliable protection to the inverter subversion in the active inversion circuits of the various thyristors due to various reasons.

Description

technical field [0001] The invention relates to an inverter subversion protection appliance with strong versatility and complete protection functions, which belongs to the technical field of control. Background technique [0002] The subversion of the inverter refers to the state in which the normal working conditions of the inverter are damaged. When the inverter is subverted, protective measures must be taken. At present, there are mainly four types of protection circuits to prevent inverter overturning: the first is to use thyristor high-speed switches for protection, this method is mainly for inverter failure caused by sudden power failure of AC power supply, phase loss or low voltage ; The second is to use a single-capacitor auxiliary shutdown protection circuit. This method mainly solves the inverter subversion caused by the instantaneous power failure on the AC side of the grid; the third is to use the forced commutation protection circuit to solve the problem caused ...

Claims

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Application Information

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IPC IPC(8): H02H7/122
Inventor 颜湘武谷建成董清张丽霞康伟张波曲伟王金省李和明
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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