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A Sequence Overlap Differential Directional Protection Method for Transmission Lines with Static Synchronous Series Compensators

A series compensation, static synchronization technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problem of difficult identification of line faults, and achieve the effect of reliable and effective criteria

Active Publication Date: 2016-10-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a sequence overlap differential directional protection method for transmission lines with static synchronous series compensators to solve the problem of difficult identification of line faults for equipment with static synchronous series compensators

Method used

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  • A Sequence Overlap Differential Directional Protection Method for Transmission Lines with Static Synchronous Series Compensators
  • A Sequence Overlap Differential Directional Protection Method for Transmission Lines with Static Synchronous Series Compensators
  • A Sequence Overlap Differential Directional Protection Method for Transmission Lines with Static Synchronous Series Compensators

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: 500kV line with static synchronous series compensator such as figure 1 shown. The line parameters are as follows: the total length of the line is 150km for the PM section, 150km for the MN section, and 220km for the NQ end. Fault location: A single-phase ground fault occurs at the MN section 1km away from the M terminal. Ground impedance 0Ω, fault time 0.464s, initial fault angle , the sampling rate is 20kHz.

[0036](1) According to the line-mode voltage and current transient data obtained in step 1 in the manual,

[0037] (2) According to step 2 in the instruction manual, perform 4th-order differential calculation on the line-mode voltage and current transient data obtained in step 1 to obtain the voltage and current differential sequence and their product differential sequence curve, such as figure 2 , 3 , 4 shown.

[0038] (3) According to formula 4 and formula 5 in step 4 in the description Figure 4 To judge, by sign[SP l (k)]=-1 shows that th...

Embodiment 2

[0039] Example 2: 500kV line with static synchronous series compensator such as figure 1 shown. The line parameters are as follows: the total length of the line is 150km for the PM section, 150km for the MN section, and 220km for the NQ end. The grounding impedance is 10Ω, the fault time is 0.454s, the initial fault angle is -90°, and the data sampling rate is 20kHz. A single-phase ground fault occurs at a distance of 149km from the M terminal in the MN section.

[0040] (1) According to the line-mode voltage and current transient data obtained in step 1 in the manual,

[0041] (2) According to step 2 in the instruction manual, perform 4th-order differential calculation on the line-mode voltage and current transient data obtained in step 1 to obtain the voltage and current differential sequence and their product differential sequence curve, such as Figure 5 , 6 , 7 shown.

[0042] (3) According to formula 4 and formula 5 in step 4 in the description Figure 4 To judge, ...

Embodiment 3

[0043] Example 3: 500kV line with static synchronous series compensator such as figure 1 shown. The line parameters are as follows: the total length of the line is 150km for the PM section, 150km for the MN section, and 220km for the NQ end. The grounding impedance is 0.1Ω, the fault time is 0.454s, the initial fault angle is -90°, and the data sampling rate is 20kHz. A single-phase ground fault occurs at a distance of 75km from the M terminal on the PM section.

[0044] (1) According to the line-mode voltage and current transient data obtained in step 1 in the manual,

[0045] (2) According to step 2 in the instruction manual, perform 4th-order differential calculation on the line-mode voltage and current transient data obtained in step 1 to obtain the voltage and current differential sequence and their product differential sequence curve, such as Figure 8 , 9 , 10 shown.

[0046] (3) According to formula 4 and formula 5 in step 4 in the description Figure 4 To judge,...

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Abstract

The invention relates to a sequence overlapping differential direction protection method for a power transmission line with a static synchronous series compensator, and belongs to the technical field of relay protection of power systems. The method includes the steps that when a failure occurs in the power transmission line with the static synchronous series compensator, line mode voltage transient quantity ul and line mode current transient quantity il with fault phases are collected and calculated through a direction relay R1 at the measurement end M, four-order sequence overlapping differential transformation is conducted on ul and il, and then a voltage differential sequence Sul and a current differential sequence Sil are acquired; the power differential sequence SPl is acquired by multiplying the voltage differential sequence by the current differential sequence, and the direction of the failure is judged according to whether the polarity of a first nonzero mutation in the SPl is positive or negative; if the polarity is negative, the failure is judged as the forward failure, or else the failure is judged as the reverse failure. According to the method, the power differential sequence acquired by multiplying the voltage differential sequence by the current differential sequence, the direction of the failure is polarized, and judgment is reliable and effective.

Description

technical field [0001] The invention relates to a sequence overlapping differential direction protection method for a transmission line with a static synchronous series compensator, and belongs to the technical field of electric power system relay protection. Background technique [0002] In recent years, due to the application of a large number of FACTS devices in the power grid, the transient process of power grid faults has become increasingly complicated, and higher requirements have been put forward for relay protection. In a system containing FACTS components, since the control parameters of FACTS components may change according to different operating conditions of the system, the amplitude and frequency of harmonics and transient components generated by faults will also vary depending on different components and fault locations The changes not only brought difficulties to the adjustment of traditional protection, but also challenged the traditional protection theory. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 束洪春苏玉格高利曹璞璘黄沈峰
Owner KUNMING UNIV OF SCI & TECH
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