Overcurrent fault monitoring protection device and method for flexible direct-current transmission inverter station

A flexible DC power transmission, overcurrent fault technology, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, electrical devices, emergency protection circuit devices, etc. , Unable to monitor, locate and classify fault current, fast rising speed of fault current, etc.

Pending Publication Date: 2017-01-25
SHENYANG POLYTECHNIC UNIV +2
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Problems solved by technology

Due to the adjustment method of the flexible DC transmission system and the inherent characteristics of its own structure, the fault current of the DC transmission line has the characteristics of fast rising speed and large peak value, and frequent overcurrent faults. When a fault occurs, the fault current can easily damage the converter of the inverter station. The current equipment and equipment are insulated, and the fle

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  • Overcurrent fault monitoring protection device and method for flexible direct-current transmission inverter station
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  • Overcurrent fault monitoring protection device and method for flexible direct-current transmission inverter station

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Embodiment Construction

[0052] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0053] Such as figure 1 As shown, an overcurrent fault monitoring and protection device for a flexible DC transmission inverter station, the device includes a microprocessor unit, a composite buffer protection unit, a power frequency conversion unit (flexible DC transmission terminal station), an IGBT drive unit, Overheat detection unit, fault current detection unit, wireless communication unit, LC filter and host computer. In this embodiment, the wireless communication unit adopts the SIM808 wireless module, which is used to wirelessly transmit the signal of the micro-processing unit to the upper computer. The computer PC is used to monitor the overcurrent and overheati...

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Abstract

The invention provides an overcurrent fault monitoring protection device and method for a flexible direct-current transmission inverter station and relates to the technical field of power system control. The device comprises a microprocessor unit, a composite buffer protection unit, a power frequency conversion unit, an IGBT drive unit, an overheating detection unit, a fault current detection unit, a wireless communication unit, an LC filter and an upper computer, wherein a microprocessor processes the current and temperature information acquired by the overheating detection unit and the fault current detection unit, drives the IGBT drive unit to control the on/off of the IGBT device and transmits the fault information to the upper computer. In the invention, the type of the fault current and the overheating fault of the power frequency conversion unit can be detected and positioned, the detected fault current is positioned, classified and processed so as to quickly and accurately inhibit the short-circuit current and overcurrent in the fault period, the damage of the power frequency conversion unit is avoided, and the monitoring position and protection of overcurrent fault of the flexible direct-current transmission inverter station are realized.

Description

technical field [0001] The invention relates to the technical field of power system control, in particular to an overcurrent fault monitoring and protection device and method for a flexible direct current transmission inverter station. Background technique [0002] With the prominence of environmental problems and the intensification of the energy crisis, renewable energy such as wind energy and solar energy has developed by leaps and bounds. As an effective way to connect clean energy to the grid, flexible DC transmission technology has attracted more and more attention. Due to the adjustment method of the flexible DC transmission system and the inherent characteristics of its own structure, the fault current of the DC transmission line has the characteristics of fast rising speed and large peak value, and frequent overcurrent faults. When a fault occurs, the fault current can easily damage the converter of the inverter station. The current equipment and equipment are insu...

Claims

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Application Information

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IPC IPC(8): G01R19/165G01K7/22G01R31/08H02H9/02
CPCH02H9/02G01K7/22G01R19/16533G01R31/08
Inventor 徐建源刘大鹏吴冠男张明理史喆张晓天王优胤梁毅宋卓然杨继业商文颖
Owner SHENYANG POLYTECHNIC UNIV
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