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A Control Method for Alternating Cathodic Protection of Grounding Electrodes in DC Transmission

A cathodic protection and control method technology, applied in the electric power field, can solve the problems of affecting the service life of the grounding electrode, and the grounding is susceptible to corrosion, and achieves the effect of solving the serious corrosion of the grounding electrode, increasing the input cost and prolonging the service life.

Active Publication Date: 2018-03-16
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide a control method for cathodic protection of the DC transmission ground electrode, aiming at the problem that the grounding of the DC transmission project is easily corroded, thereby affecting the service life of the ground electrode

Method used

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  • A Control Method for Alternating Cathodic Protection of Grounding Electrodes in DC Transmission
  • A Control Method for Alternating Cathodic Protection of Grounding Electrodes in DC Transmission
  • A Control Method for Alternating Cathodic Protection of Grounding Electrodes in DC Transmission

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Embodiment Construction

[0027] A control method for realizing the cathodic protection of the direct current transmission ground electrode proposed by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Such as figure 1 As shown, the present invention improves on the basis of the constant current controller for high-voltage direct current transmission, and the current reference value of one pole (pole 2 in this embodiment) is the normal current reference value Iref, that is, the normal operation of the DC project Current value, the current given value of the other pole is I±ΔI, and the current changes once every predetermined time. As a result, the current direction of the ground electrode changes with time, and the potential of the ground electrode to ground changes with time, thereby realizing the alternate cathodic protection of the ground electrode at the sending and receiving end.

[0029] Such as figure 2 and ...

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Abstract

The invention relates to a control method for realizing the cathodic protection of the DC transmission ground electrode, which is improved on the basis of the constant current control mode of the DC transmission project, and adopts the mode of alternately changing the slight deviation of the current value of one pole to realize the sending end and the receiving end The alternate cathodic protection of the ground electrode reduces the corrosion loss of the ground electrode, greatly prolongs the service life of the ground electrode, and solves the problem of serious corrosion of the ground electrode caused by unbalanced current and other problems.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a control method for realizing cathodic protection of DC transmission ground electrodes. Background technique [0002] At present, most of the high-voltage direct current transmission systems put into operation in the world are two-terminal direct current transmission systems, that is, one end is a rectifier station and the other end is an inverter station. Usually its operation mode includes bipolar operation, unipolar earth loop operation, and unipolar metal loop operation. Among them, in the operation of the unipolar metal return line, the ground electrode plays the role of the front neutral point potential; while in the operation of the bipolar and single pole earth return lines, the ground electrode not only plays the role of the front neutral point, but also serves as the front neutral point. A direct current provides a path. [0003] When a current flows through the ground ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F13/04
Inventor 黎小林赵晓斌黄莹饶宏李明
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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