Distance protection method for power transmission line containing unified power flow controller

A technology of power flow controller and transmission line, applied in the direction of emergency protection circuit devices, electrical components, fault locations, etc., can solve the problems of changing steady-state components and transient components, distance protection measurement impedance and performance impact, etc., to ensure correctness sexual effect

Active Publication Date: 2015-12-30
ELECTRIC POWER SCI RES INST OF JIANGSU ELECTRIC POWER +1
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  • Abstract
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Problems solved by technology

[0006] The technical problem solved by the present invention is to overcome the existing power grid connected to UPFC. During the fault period, the operating characteristics

Method used

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  • Distance protection method for power transmission line containing unified power flow controller
  • Distance protection method for power transmission line containing unified power flow controller
  • Distance protection method for power transmission line containing unified power flow controller

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[0030] The present invention will be further described below in conjunction with the accompanying drawings of the specification.

[0031] Such as figure 1 As shown, the distance protection method for a transmission line containing a unified power flow controller of the present invention includes the following steps:

[0032] Step (1), set the fault distance l iter The initial value of, let l iter =0.5l whole , Where l iter Is the fault distance, that is, the distance from the place where the relay protection device is installed to the fault point, l whole Is the total length of the transmission line. If the transmission line fails, record the time of failure as t 0 ;

[0033] Step (2), obtain the sampling value of the relay protection device at the current sampling point, and the sampling time corresponding to the current sampling point is t cal ;

[0034] Step (3), preprocess the acquired sampling values ​​to obtain the measured voltage and current after processing by the second-...

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Abstract

The invention discloses a distance protection method for a power transmission line containing a unified power flow controller. According to the method, a complex neural network algorithm or synchronous measurement phasor information on the two sides of the line is not required to be adopted, the voltage and current on the same side are used only, in cooperation with an R-L differential equation algorithm, the distance from a fault point to a mounting position of a relay protection device can be obtained through calculation, faults inside and outside regions can be recognized according to fault distance calculation results and fluctuation degree thereof, and influences of UPFC operation modes and control parameters are avoided, so that the accuracy of protection action behaviors is guaranteed, high convenience and reliability are realized, implementation is easy and a good application prospect is realized.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a distance protection method for a power transmission line with a unified power flow controller. Background technique [0002] The unified power flow controller (UPFC) is composed of series converters and parallel converters. The series converters inject a series voltage with adjustable amplitude and phase to the grid through series transformers to control the active power and Reactive power flow; the parallel converter absorbs or provides active power through the parallel transformer to maintain a constant DC side voltage, and at the same time absorbs or provides reactive power to adjust the voltage of the AC bus connected to the UPFC. Therefore, UPFC can change the AC bus voltage, line parameters and power flow, thereby greatly increasing the transmission capacity of transmission lines, reducing line losses and improving system stabili...

Claims

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Application Information

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IPC IPC(8): H02H7/26G01R31/08
Inventor 孔祥平袁宇波高磊黄浩声李鹏王业林金娇
Owner ELECTRIC POWER SCI RES INST OF JIANGSU ELECTRIC POWER
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