Mode recognition-based current transient state quantity direction protection method for power transmission line with unified power flow controller

A technology of power flow controller and transmission line, which is applied in the direction of current indication, emergency protection circuit devices, electrical components, etc., can solve the problems of difficult identification of line faults, and achieve the effect of reliable identification of fault sections and high reliability

Inactive Publication Date: 2015-10-21
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for protecting the direction of current transient quantity of a transmission line wit

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  • Mode recognition-based current transient state quantity direction protection method for power transmission line with unified power flow controller
  • Mode recognition-based current transient state quantity direction protection method for power transmission line with unified power flow controller
  • Mode recognition-based current transient state quantity direction protection method for power transmission line with unified power flow controller

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Embodiment 1

[0028] 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 is 0.2ms before the fault and 1ms after the fault. 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 .

[0029] The first step is to install the unified power flow controller at the midpoint of the transmission line, and use the simulation data to form historical samples: when the initial phase angle of the fault is set to 90° and -90°, set 19 reverse positions along the entire length of the transmission line single-phase metallic ground faults, 28 single-phase metallic ground faults at positive positions, among which 14 faults are set between the measurement terminal M and the installation point of the unified power f...

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Abstract

The invention relates to a mode recognition-based current transient state quantity direction protection method for a power transmission line with a unified power flow controller, and belongs to the technical field of power system relay protection. When the power transmission line with the unified power flow controller has a fault, data, which is obtained at a line measurement end, of line mode current containing a fault phase is subjected to principal component analysis, and a forward direction fault is distinguished from a back direction fault according to the projection of sample data on a first principal component axis. According to the invention, principal component cluster analysis directional protection of the line mode current containing the fault phase can reliably distinguish the forward direction fault from the back direction fault, also can judge that the forward direction fault is positioned at the left side or the right side of the unified power flow controller, and can reliably recognize a fault section. Therefore, criterions about property recognition of the forward direction fault and the backward direction fault have high reliability.

Description

technical field [0001] The invention relates to a method for protecting the direction of current transient quantity of a transmission line with a unified power flow controller based on pattern recognition, and belongs to the technical field of relay protection of electric power systems. Background technique [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] Aiming at the problem of difficult identific...

Claims

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Application Information

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IPC IPC(8): H02H7/26G01R31/08G01R19/14
Inventor 束洪春韩倩倩吕蕾曹璞璘苏玉格
Owner KUNMING UNIV OF SCI & TECH
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