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A DC differential protection method for segmented valve group

A DC difference, segmented technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as misoperation, and achieve the effect of excellent performance and ingenious design

Active Publication Date: 2017-01-11
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solved the misoperation behavior of the original valve group differential protection when a fault occurs on the inverter side of the metal loop

Method used

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  • A DC differential protection method for segmented valve group
  • A DC differential protection method for segmented valve group
  • A DC differential protection method for segmented valve group

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0032] The structure diagram of the present invention is as figure 1 , 2 , Shown in 3, the segmented valve group DC differential protection method of the present invention comprises the following steps:

[0033] 1) Determine the protection segment and its setting value, as well as the time delay;

[0034] 2) Determine the braking slope characteristics of each section of protection;

[0035] 3) Adopt the non-integral characteristics of each segment;

[0036] 4) Establish an electromagnetic transient model, perform EMTDC electromagnetic transient simulation, observe the measurement signal curve, and verify whether the selection of the fixed value is reasonable.

[0037] 5) According to different fault modes, verify that the protection performance meets the requirements.

[0038] The above step 1) determines the use of three-stage protection logic, which are protection section I, protection section II, and protection section III. Among them, protection section I is an alarm s...

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PUM

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Abstract

The invention discloses a direct-current differential protection method for a sectional type valve bank. The direct-current differential protection method for the sectional type valve bank comprises the following steps: 1) determining a protection section and a sectional constant value, and delaying; 2) determining the brake slope characteristic for protecting each section; 3) adopting the non-integral characteristic of each section; 4) establishing an electromagnetic transient model; and 5) according to different fault modes, verifying the protection performance to satisfy the requirement. According to the direct-current differential protection method for the sectional type valve bank, which is disclosed by the invention, for faults within the protection range of the original valve bank differential protection, correction action still can be carried out, and the situation of failure to operate is avoided. The maloperation behavior of the original valve bank differential protection when faults happen to a metal loop inversion side is eliminated.

Description

technical field [0001] The invention relates to a segmented valve group DC differential protection method, which belongs to the transformation technology of the segmented valve group DC differential protection method. Background technique [0002] In the field of power system DC engineering, in order to ensure the safe operation of equipment, in the case of DC system failure, the fault can be quickly isolated through relay protection and other measures. Among them, the DC valve group is the key equipment in operation, and it is usually solved by relay protection methods such as overcurrent protection, differential protection, harmonic components, and DC low voltage. [0003] Among them, the valve group differential protection is widely used in engineering, but in the actual operation process, due to the complex operating conditions on site, the boundary conditions of the system vary with the size of the DC transmission power, the impedance capacity of the AC system, the resp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 李明杨煜李婧靓邓晶
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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