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A Transient Energy Directional Protection Method for Transmission Lines with Static Synchronous Series Compensators

A technology of series compensation and static synchronization, applied to emergency protection circuit devices, electrical components, fault locations, etc., can solve problems such as difficult identification of line faults, achieve the effect of avoiding inconstant changes in positive and negative polarity and improving reliability

Active Publication Date: 2016-10-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a transient energy direction protection method for a transmission line with a static synchronous series compensator to solve the problem of difficult identification of line faults with static synchronous series compensators

Method used

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  • A Transient Energy Directional Protection Method for Transmission Lines with Static Synchronous Series Compensators
  • A Transient Energy Directional Protection Method for Transmission Lines with Static Synchronous Series Compensators
  • A Transient Energy Directional Protection Method for Transmission Lines with Static Synchronous Series Compensators

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 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. The ground impedance is 0Ω, and the data sampling rate is 20kHz. A single-phase ground fault occurs 60km away from the M terminal on the MN section.

[0032] (1) Calculate the instantaneous power according to the formula (1) in the manual, the instantaneous power at the M terminal is as follows figure 2 shown.

[0033] (2) According to the formula (2) in the manual, the instantaneous power is integrated to obtain the corresponding transient energy, and the transient energy at the M terminal is as follows image 3 shown.

[0034] (3) Judgment of the sign of the transient energy according to formula (3) in the specification, by image 3 middle sign (E M ) = -1 to know the point of failure (F 11 ) for M terminal relay R 1 Fault in p...

Embodiment 2

[0035] 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 ground impedance is 0Ω, and the data sampling rate is 20kHz. A single-phase ground fault occurs 90km away from the M terminal in the MN section.

[0036] (1) Calculate the instantaneous power according to the formula (1) in the manual, the instantaneous power at the M terminal is as follows Figure 4 shown.

[0037] (2) According to the formula (2) in the manual, the instantaneous power is integrated to obtain the corresponding transient energy, and the transient energy at the M terminal is as follows Figure 5 shown.

[0038] (3) Judgment of the sign of the transient energy according to formula (3) in the specification, by Figure 5 middle sign (E M ) = -1 to know the point of failure (F 12 ) for M terminal relay R 1 Fault in...

Embodiment 3

[0039] 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 ground impedance is 0Ω, and the data sampling rate is 20kHz. A single-phase ground fault occurs 50km away from the M terminal on the PM section.

[0040] (1) Calculate the instantaneous power according to the formula (1) in the manual, the instantaneous power at the M terminal is as follows Figure 6 shown.

[0041] (2) According to the formula (2) in the manual, the instantaneous power is integrated to obtain the corresponding transient energy, and the transient energy at the M terminal is as follows Figure 7 shown.

[0042] (3) Judgment of the sign of the transient energy according to formula (3) in the specification, by Figure 7 Medium sign (E M)=1 to know the point of failure (F 2 ) for M terminal relay R 1 For the rever...

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Abstract

The invention relates to a transient energy 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, instantaneous power p(t) is acquired by multiplying three-phase current and voltage failure transient components delta ik and delta uk together, wherein delta ik and delta uk are acquired at the measurement end of the line, and k=a, b and c; transient energy E(t) is acquired by conducting integral computation on the instantaneous power p(t) in a window at 3ms, and the direction of the failure is judged according to whether a symbol of the energy value is positive or negative; if the symbol of the energy value is negative, the failure is judged as the forward failure, or else the failure is judged as the reverse failure. The polarity, acquired by conducting integral on the instantaneous power, of transient energy is accurate, it is avoided that the positive polarity and the negative polarity of the instantaneous power is inconstant in change after the failure, and therefore reliability of judgment is improved.

Description

technical field [0001] The invention relates to a transient energy 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. [0003] Static ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
CPCY04S10/52
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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