Control and processing method for UHV DC project without grounding electrode

Abstract

A control processing method for UHV DC project without grounding poles, which is provided with a bipolar synchronous unlocking / blocking unit, a bipolar current following unit, a bipolar joint jump unit, and an overload limiting unit; a bipolar synchronous unlocking / blocking unit The bipolar synchronous release / blocking processing is performed, the bipolar current following unit performs bipolar current following processing, the bipolar joint tripping unit performs bipolar joint tripping processing, and the overload limiting unit performs limiting overload processing. The invention solves the problem of maintaining bipolar balanced operation when the DC project uses the grounding grid in the station as the grounding pole. The unlocking and emergency shutdown of the two poles can be completed in a relatively short period of time, and the ground current and its duration can be reduced. The invention is scientific and effective, and can meet the requirements of engineering applications.

Description

technical field [0001] The invention relates to a DC engineering control system, in particular to a control and processing method for UHV DC engineering operating in a non-grounding electrode mode. Background technique [0002] The grounding electrode is an important part of the conventional DC engineering. It not only plays the role of clamping the DC neutral point potential, but also provides the ground as the current return path for the DC single-pole ground return method and the double-pole grounding method. Therefore, if There is no grounding pole, although the DC neutral point potential can be clamped by the grounding network in the station, the earth cannot be used as the current return path. Therefore, if a unipolar block occurs during DC bipolar operation, the DC current will not have a transfer circuit and cause bipolar atresia. DC will usually not be able to run bipolar, but can only run in the form of unipolar metal loops, which will reduce the DC transmission c...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a control and processing method for UHV DC projects without grounding poles, so that the unlocking and emergency shutdown of the two poles can be completed in a relatively short period of time, and the grounding current can be reduced and its duration, which solves the problem in the prior art that using the ground grid in the station as the ground electrode cannot maintain bipolar balance

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