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Method for realizing current measurement abnormality detection in direct current protection system

A DC protection system and current measurement technology, applied in measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve problems such as protection malfunction, DC shutdown, etc., to ensure reliability, accurate results, and avoid DC blocking the effect of the event

Inactive Publication Date: 2016-01-06
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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Problems solved by technology

[0002] In HVDC power transmission projects, the existing DC protection system judges whether the DC system is faulty by collecting electrical quantities such as DC voltage and current, and judges whether there is a fault in the DC system through the change trend of the electrical quantities. One pole will be equipped with four current measuring devices. The DC bus depends on the converter valve side current IDCH, the high-voltage DC bus depends on the line side current IDLH, the neutral bus depends on the converter valve side current IDCN, and the neutral bus depends on the ground electrode side current IDLN, four quantities are used for DC control and protection systems Among them, the current DC project lacks detection methods for abnormal DC current measurement. As the degree of current measurement abnormality intensifies, it may even lead to protection malfunctions, and then shut down DC

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  • Method for realizing current measurement abnormality detection in direct current protection system
  • Method for realizing current measurement abnormality detection in direct current protection system
  • Method for realizing current measurement abnormality detection in direct current protection system

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Embodiment Construction

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings and embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them.

[0022] see figure 1 and image 3 , figure 1 It is a schematic diagram of electrical quantity collection in a DC converter station. figure 2 It is a flow chart of the steps of the method for realizing abnormal detection of current measurement in the DC protection system of the present invention. image 3 Schematic flow chart for current consistency

[0023] In the embodiment of the present invention, such as figure 1 As shown, taking the DC line where the DC converter station of pole I is located as an example, due to the collection of the following electrical quantities in the DC converter station: the current IDCH on the side of the high-voltage DC bus near the converter valve, the curren...

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Abstract

The invention discloses a method for realizing current measurement abnormality detection in a direct current protection system, through consistency detection of four current amplitude values of current IDCH of a high voltage direct current bus close to a converter valve side, current IDLH of the high voltage direct current bus close to a line side, current IDCN of a neutral bus closed to the converter valve side and current IDLN of the neutral bus close to a grounding electrode side in a delay T, criteria of a current abnormality are obtained, and a corresponding event is generated and fault recording is triggered to operation maintenance personnel, so that hidden danger of a current measurement abnormality can be discovered in time, thereby providing a basis for operating personnel to make a decision, and avoiding a direct current locking event caused by aggravation of the current measurement abnormality.

Description

technical field [0001] The invention relates to the field of high-voltage direct current transmission in electric power systems, in particular to a method for realizing abnormal detection of current measurement in a direct current protection system. Background technique [0002] In HVDC power transmission projects, the existing DC protection system judges whether the DC system is faulty by collecting electrical quantities such as DC voltage and current, and judges whether there is a fault in the DC system through the change trend of the electrical quantities. One pole will be equipped with four current measuring devices. The DC bus depends on the converter valve side current IDCH, the high-voltage DC bus depends on the line side current IDLH, the neutral bus depends on the converter valve side current IDCN, and the neutral bus depends on the ground electrode side current IDLN, four quantities are used for DC control and protection systems In the current DC project, there is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
Inventor 邬乾晋陈欢张楠国建宝
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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