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Valve bank differential protection method performing synthesis judgment based on difference stream waveforms

A differential protection, valve group technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of AC system misoperation, according to the action, etc., to prevent the valve group differential protection misoperation

Active Publication Date: 2017-05-17
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
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Problems solved by technology

[0007] To sum up, if the valve group differential protection adopts the principle of differential current integration, there will be a risk of misoperation when the AC system fails; risk

Method used

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  • Valve bank differential protection method performing synthesis judgment based on difference stream waveforms
  • Valve bank differential protection method performing synthesis judgment based on difference stream waveforms
  • Valve bank differential protection method performing synthesis judgment based on difference stream waveforms

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Embodiment Construction

[0033] The technical solution of the present application will be further introduced in detail below in conjunction with the accompanying drawings of the description.

[0034] The conventional DC valve group differential protection method based on the comprehensive discrimination of differential current waveforms disclosed in this application can effectively prevent the AC system from The valve group differential protection malfunctions when a fault occurs, and the valve group differential protection can reliably act to eliminate the fault when a fault occurs in the area.

[0035] refer to Figure 4 , the conventional DC valve group differential protection method based on comprehensive discrimination of differential current waveforms disclosed in the present application includes: determining whether the fault location is In the zone, if the fault occurs in the zone, the differential protection can act quickly, otherwise the differential protection will return immediately. The...

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Abstract

The invention provides a valve bank differential protection method performing synthesis judgment based on difference stream waveforms. According to the invention, synthesis judgment is performed based on difference stream waveforms of the a valve bank and whether failures are in a protection range or not is identified according to features of the difference stream waveforms. Then adjustment is made on time delay of valve bank difference based on the synthesis judgment of difference streams and differential motion constant values of the valve bank. By adopting the invention, error action of valve bank differential protection due to discontinuous differential stream influence when an alternating current system meets failures can be prevented. At the same time, failures can be isolated with reliable action of differential protection when troubles inside the sample space occur. The method can be widely applied to a high voltage DC power transmission field.

Description

technical field [0001] The invention relates to a method for realizing differential protection of a converter valve group in a high-voltage direct current transmission system, and belongs to the technical field of high-voltage direct current transmission and equipment protection. Background technique [0002] The main task of the protection system of the DC transmission system is to protect the safe operation of the DC converter equipment, quickly and reliably isolate faults, and reduce the risk of damage to the converter equipment. At present, my country is in the stage of large-scale commercialization of high-voltage DC, and is entering the era of UHV and large capacity. After the capacity and voltage level of the DC converter are increased, the fault current rises very quickly after an internal fault such as a short circuit of the converter occurs; at the same time, the cost of the DC converter is also becoming more and more expensive. Therefore, when a fault occurs insi...

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/262H02H7/268
Inventor 刘涛刘志超李明刘树曹润彬李树峰于昊夫黄辉
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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