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High-voltage transmission convertor station overvoltage protection device

An overvoltage protection device and high-voltage power transmission technology, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve the problem of limited voltage tolerance level and damage to converters and other problems to achieve the effect of preventing misoperation, protecting normal operation, and realizing fault ride-through

Active Publication Date: 2015-07-08
PINGDINGSHAN POWER SUPPLY ELECTRIC POWER OF HENAN +1
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AI Technical Summary

Problems solved by technology

[0005] When the converter is switched on and off, the two ends of the converter valve will bear a large operating overvoltage, and the converter valve usually uses a thyristor device, and its voltage tolerance level is limited, so overvoltage damage to the converter will often occur. device

Method used

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  • High-voltage transmission convertor station overvoltage protection device
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  • High-voltage transmission convertor station overvoltage protection device

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Embodiment Construction

[0028] An overvoltage protection device for a high-voltage transmission converter station, which suppresses the harm caused by overvoltage in a transmission line by connecting a protection circuit in series on the AC side and a protection circuit in parallel at a thyristor valve group.

[0029] Converter valve, also known as thyristor valve (Thynstor Valve), is the core equipment of direct current transmission, and is a kind of power equipment based on thyristor series technology for electric energy form conversion. Modern large-scale high-voltage direct current transmission projects use thyristors as the main components to form 6-pulse or 12-pulse bridge converters. Each converter bridge arm is generally composed of dozens or even hundreds of thyristors in series, that is, thyristor valves. .

[0030] The metal oxide voltage limiter can usually withstand the action of voltage under normal and overload operating conditions; it can withstand the effect of swing current; it can ...

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Abstract

Provided is a high-voltage transmission convertor station overvoltage protection device. By connecting a protection circuit to an AC side serial-connection protection circuit and a thyristor valve bank in parallel, the damage caused by overvoltage in a transmission line is restrained, the energy produced by faults in the transmission line at the front stage and the rear stage of a convertor station is rapidly absorbed, the normal running of the transmission line is protected, and fault ride-through is achieved.

Description

technical field [0001] The invention relates to the technical field of overvoltage protection in a high-voltage direct current transmission system, in particular to an overvoltage protection device for a high-voltage transmission converter station. Background technique [0002] At present, my country's high-voltage direct current transmission system is mainly responsible for the important tasks of long-distance, large-capacity power transmission and regional power grid interconnection. Once the DC transmission system suffers from overvoltage caused by lightning, operation, failure or other reasons, once the equipment insulation breakdown accident causes the DC system to shut down, it may cause the load center to lose large-capacity power supply, and then endanger the regional power grid. The consequences will be very serious, especially the damage to a large-scale AC-DC hybrid system like my country's Southern Power Grid will be unimaginable. In recent years, with the rapid ...

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Application Information

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IPC IPC(8): H02H9/06H02H9/02H02J3/36
CPCY02E60/60
Inventor 马新攀
Owner PINGDINGSHAN POWER SUPPLY ELECTRIC POWER OF HENAN
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