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Transient energy direction protection method for power transmission line with static synchronous series compensator

A series compensation, static synchronization technology, applied in emergency protection circuit devices, electrical components, information technology support systems, etc., can solve problems such as difficulty in identifying line faults, avoid inconstant changes in positive and negative polarities, and improve reliability. Effect

Active Publication Date: 2014-04-30
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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  • Transient energy direction protection method for power transmission line with static synchronous series compensator
  • Transient energy direction protection method for power transmission line with static synchronous series compensator
  • Transient energy direction protection method for power transmission line with static synchronous series compensator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: 500kV line with static synchronous series compensator figure 1 Shown. The line parameters are as follows: the length of the line is 150km at the PM section, 150km at the MN section, and 220km at the NQ end. The ground impedance is 0Ω, and the data sampling rate is 20kHz. A single-phase ground fault occurred 60km from the M end of the MN section.

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

[0033] (2) Integrate the instantaneous power according to the formula (2) in the manual to obtain the corresponding transient energy, the transient energy of the M terminal is as image 3 Shown.

[0034] (3) According to the formula (3) in the manual, judge the sign of transient energy, by image 3 Sign in ( E M ) = -1 Know the fault point ( F 11 ) For M terminal relay R 1 It is a fault in the positive direction.

Embodiment 2

[0035] Example 2: 500kV line with static synchronous series compensator figure 1 Shown. The line parameters are as follows: the length of the line is 150km at the PM section, 150km at the MN section, and 220km at the NQ end. The ground impedance is 0Ω, and the data sampling rate is 20kHz. A single-phase ground fault occurred at 90km from the M end of the MN section.

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

[0037] (2) Integrate the instantaneous power according to the formula (2) in the manual to obtain the corresponding transient energy, the transient energy of the M terminal is as Figure 5 Shown.

[0038] (3) According to the formula (3) in the manual, judge the sign of transient energy, by Figure 5 Sign in ( E M ) = -1 Know the fault point ( F 12 ) For M terminal relay R 1 It is a fault in the positive direction.

Embodiment 3

[0039] Example 3: A 500kV line with static synchronous series compensator is like figure 1 Shown. The line parameters are as follows: the length of the line is 150km at the PM section, 150km at the MN section, and 220km at the NQ end. The ground impedance is 0Ω, and the data sampling rate is 20kHz. A single-phase ground fault occurred at 50km from the M end of the PM segment.

[0040] (1) Calculate the instantaneous power according to the formula (1) in the manual, the instantaneous power of the M terminal is as follows Image 6 Shown.

[0041] (2) Integrate the instantaneous power according to the formula (2) in the manual to obtain the corresponding transient energy, the transient energy of the M terminal is as Figure 7 Shown.

[0042] (3) According to the formula (3) in the manual, the sign of transient energy is judged by Figure 7 Sign in ( E M )=1 Know the fault point ( F 2 ) For M terminal relay R 1 Fault in the opposite direction. ...

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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, belonging to the technical field of power system relay protection. Background technique [0002] In recent years, due to the application of a large number of FACTS equipment in the power grid, the transient process of grid faults has become increasingly complicated, and higher requirements have been placed on relay protection. In a system containing FACTS components, since the control parameters of FACTS components may vary according to different operating conditions of the system, the amplitude and frequency of harmonics and transient components generated by faults will also depend on different components and fault locations. However, changes have not only brought difficulties to the setting of traditional protection, but also challenged traditional protection theories. [0003] Static synchronous series compensator (...

Claims

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Application Information

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Patent Type & Authority Applications(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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