Control processing method for extra-high voltage DC project operation in non-grounding-electrode mode

Abstract

The invention relates to a control processing method for extra-high voltage DC project operation in a non-grounding-electrode mode. In the method, a bipolar synchronization unlocking / locking unit, a bipolar current tracking unit, a bipolar shunt tripping unit and an overload limiting unit are adopted. The bipolar synchronization unlocking / locking unit is used for performing bipolar synchronization unlocking / locking. The bipolar current tracking unit is used for performing bipolar current tracking. The bipolar shunt tripping unit is used for performing bipolar shunt tripping. The overload limiting unit is used for limiting an overload. The problem of how to maintain bipolar balanced operation in the processing of using an in-station grounding grid as a grounding electrode in a DC project is solved through the method. In this way, based on the method, bipolar unlocking and locking and emergency outage can be completed within a short time, grounding current can be reduced, and the duration of the grounding current can be shortened. The method is scientific, effective and capable of meeting the requirements of project 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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