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Transient energy protection method of transmission line with unified power flow controller

A technology of power flow controller and transmission line, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of misjudgment of traditional relay protection, achieve the effect of avoiding inconstant changes in positive and negative polarity and improving reliability

Inactive Publication Date: 2015-10-07
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the existing relay protection relies on the power frequency voltage, power frequency current and the calculated corresponding impedance value to judge the fault in the area and outside the area, the access of UPFC will lead to misjudgment in the traditional relay protection

Method used

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  • Transient energy protection method of transmission line with unified power flow controller
  • Transient energy protection method of transmission line with unified power flow controller
  • Transient energy protection method of transmission line with unified power flow controller

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: contain UPFC vertical line system simulation model such as figure 1 As shown, UPFC is installed at the midpoint of the line (75km away from MN), and the total length of line MN is 150km. The fault initial angle is 90°, the sampling rate is 20kHz, and the time window length is 3ms. Let the AG fault F occur at a distance of 60km from the M side between the M side and the UPFC input point on the line MN 11

[0026] 1. Use the measurement terminal of the transmission line to obtain the influence of UPFC input on the fault current and voltage, such as figure 2 , image 3 shown. Calculate the instantaneous power according to formula (1) in the specification.

[0027] 2. According to the formula (2) in the manual, the instantaneous power is integrated to obtain the corresponding transient energy, such as Figure 4 shown.

[0028] 3. According to the formula (3) and (4) in the description, the sign of the transient energy is judged, by Figure 4 middle si...

Embodiment 2

[0030] Embodiment 2: contain UPFC vertical line system simulation model such as figure 1 As shown, UPFC is installed at the midpoint of the line (75km away from MN), and the total length of line MN is 150km. The fault initial angle is 90°, the sampling rate is 20kHz, and the time window length is 3ms. Let the AG fault F occur on the line PM 40km away from the M side 2 .

[0031] 1. Use the measuring end of the transmission line to obtain the influence of UPFC input on the fault current and voltage, and calculate the instantaneous power according to the formula (1) in the manual.

[0032] 2. According to the formula (2) in the manual, the instantaneous power is integrated to obtain the corresponding transient energy, such as Figure 5 shown.

[0033] 3. According to the formula (3) and (4) in the description, the sign of the transient energy is judged, by Figure 4 middle sign(E M )>0 and sign(E N ) 2 ) for M terminal relay R 1 For the reverse direction fault, for the N...

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Abstract

The invention relates to a transient energy protection method of a transmission line with a unified power flow controller, which belongs to the technical field of power system relay protection. When the transmission line with the unified power flow controller fails, according to current and voltage values measured by transformers on both ends of the line, transient energy values on both ends of the line are calculated. Through symbols of the transient energy values on both ends of the line, in region and out region failures are judged and distinguished. If the symbols of the transient energy on both ends of the line are respectively positive and negative, out region failures are judged. If the symbols of the transient energy values on both ends of the line are negative, in region failures are judged. According to the invention, instantaneous power transient energy polarity acquired through integrating can be determined; unconstant change of instantaneous power positive and negative polarity after a failure can be avoided; and the judgment reliability is improved.

Description

technical field [0001] The invention relates to a transient energy protection method for a power transmission line with a unified power flow controller, and belongs to the technical field of electric power system relay protection. technical background [0002] Unified Power Flow Controller (UPFC) is a new generation of flexible AC power transmission device with the most powerful functions and the most superior characteristics, and it is also the most versatile FACTS device so far. Changing parameters such as voltage and current on a transmission line has a very significant control effect. Since the existing relay protection relies on the power frequency voltage, power frequency current and the calculated corresponding impedance value to judge the fault in the area and outside the area, the access of UPFC will lead to misjudgment in the traditional relay protection. [0003] Due to the fact that the control system will not be able to act in time at the initial moment of the ...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 束洪春韩倩倩曹璞璘苏玉格白冰
Owner KUNMING UNIV OF SCI & TECH
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