Method for realizing voltage measurement abnormity detection in direct-current station control system

A technology of DC voltage and station control system, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problems of poor reliability and low efficiency, and achieve accurate judgment results, guarantee reliability, and strong engineering usability. Effect

Active Publication Date: 2015-08-19
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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  • Abstract
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AI Technical Summary

Problems solved by technology

At present, the judgment of abnormal DC voltage UdH measurement can only rely on the observation of operators, which has low efficiency and poor reliability.

Method used

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  • Method for realizing voltage measurement abnormity detection in direct-current station control system
  • Method for realizing voltage measurement abnormity detection in direct-current station control system

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Embodiment

[0024] Such as figure 1 , figure 2 As shown, a method for detecting abnormal voltage measurement in a DC station control system includes the following steps:

[0025] A. Obtain the pole 1 DC voltage UdH_1 and pole 2 DC voltage UdH_OP_2 sent by pole 1 to the DC station control system, and the pole 2 DC voltage UdH_2 and pole 1 DC voltage UdH_OP_1 sent by pole 2 to the DC station control system, of which pole 1 and Pole 2 is the opposite DC pole, and the DC voltage of this pole will be sent to the opposite pole between pole 1 and pole 2;

[0026] B. Set two threshold values ​​in advance, set the amplitude of the measurement system within the normal error range as the value K, when the two valve group trigger pulses of the DC pole and the pole are both in the enabled state, select the corresponding threshold value 2K, otherwise the selection threshold is K;

[0027] C. Calculate the absolute value of the difference between pole 1 DC voltage UdH_1 and pole 1 DC voltage UdH_OP_...

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Abstract

The invention provides a method for realizing voltage measurement abnormity detection in a direct-current station control system. The method comprises: local pole voltages and antipole voltages sent by two direct-current poles to a direct-current station control unit are respectively obtained; according to an amplitude of the measurement system in a normal range, a large threshold value and a small threshold value are set; when two valve group trigger pulses of the local pole of the direct-current pole are in enabling states, the large threshold value is selected; and otherwise, the small threshold value is selected; an absolute value of a difference value of two voltages of UdH and UdH_OP of the direct-current pole is calculated in the direct-current station control unit; if the absolute value of the difference value of the direct-current pole is larger than the local threshold value, a first criterion of the direct-current pole is generated; if any valve group trigger pulse in the direct-current pole unit is in an enabling state, a second criterion of the direct-current pole is generated; logic and operation are carried out on the first criterion and the second criterion to obtain a voltage measurement abnormity detection result in the direct-current pole unit. Therefore, the hidden danger of the voltage measurement abnormity can be found timely; a basis can be provided for decision making for the operator; and a direct-current latching event caused by the voltage measurement degree increase can be avoided.

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 detecting abnormalities in voltage measurement in a direct current station control system. Background technique [0002] In some UHV DC transmission projects, one pole is formed by connecting two valve groups in series. A single valve group is controlled by the valve group control system, and the valve group protection system can stop the valve group to avoid the expansion of the fault range after the valve group fails; each pole is controlled by the pole control system, and the pole protection system is After a pole fails, the pole can be shut down to avoid the expansion of the fault range. The normal operation of pole control, pole protection, valve group control and valve group protection all depend on the measurement system to transmit the key quantities of the pole and valve group to the above systems. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/165
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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