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Ultra-high-voltage transmission line relay protection method based on break variable differential coefficient matrix

A transmission line and coefficient matrix technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as enhancing the impact of faults on power grid stability

Active Publication Date: 2013-09-11
STATE GRID CORP OF CHINA +3
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Problems solved by technology

Since the impact of non-full-phase operation on system stability is far less than that of three-phase tripping, the action strategy of tripping three-phase lines by zero-sequence current differential protection will strengthen the impact of faults on grid stability

Method used

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  • Ultra-high-voltage transmission line relay protection method based on break variable differential coefficient matrix
  • Ultra-high-voltage transmission line relay protection method based on break variable differential coefficient matrix
  • Ultra-high-voltage transmission line relay protection method based on break variable differential coefficient matrix

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Embodiment Construction

[0024] The technical solution of the present invention will be further described in detail according to the accompanying drawings.

[0025] figure 1 It is a schematic diagram of a UHV transmission line fault applying the method of the present invention. The fundamental frequency electrical quantity of the UHV transmission line at the protective installations of the m-side substation and the n-side substation are respectively measured by the synchrophasor measurement unit (PMU) installed in the two substations. The synchronized phasor measuring unit measures the positive, negative and zero-sequence voltage mutations of phase A of the UHV transmission line at the protective installation of the m substation , , , Phase A positive, negative, zero-sequence current sudden change , , ; The synchronized phasor measuring unit measures the A, B, and C phase current mutations of the UHV transmission line at the protection installation of the substation n , , The measure...

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Abstract

The invention discloses an ultra-high-voltage transmission line relay protection method based on a break variable differential coefficient matrix. The method includes by utilizing a distributed parameter model, computing three-phase current break variables of the other end of an ultra-high-voltage transmission line by positive, negative and zero-sequence voltage break variables and current break variables of one end of the ultra-high-voltage transmission line and positive, negative and zero-sequence current break variables of the other end of the ultra-high-voltage transmission line by the aid of a symmetrical component method, further computing the break variable differential coefficient matrix, forming protection criterions according to size relationships of elements of the break variable differential coefficient matrix, and distinguishing fault phases of the ultra-high-voltage transmission line. The distributed parameter model is used as a physical model and unaffected by distributed capacitance current, and the method is applicable to any voltage classes and in particular to ultra-high-voltage transmission lines.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a method for relay protection of UHV transmission lines based on a sudden change differential coefficient matrix. Background technique [0002] At present, China has built the world's first officially grid-connected Jindongnan-Nanyang-Jingmen 1000kV UHV AC transmission line. According to the State Grid Corporation's "Unified Strong Smart Grid Research Report", China will build 39,000 kilometers of UHV AC transmission lines by 2015, and 47,000 kilometers of UHV AC transmission lines by 2020. The backbone grid structure, the national grid pattern of coordinated development of power grids at all levels. [0003] The UHV AC transmission network can greatly increase the power transmission capacity, alleviate China's tight transportation situation, help reduce transmission loss, save transmission costs, save energy and reduce emissions, thereby promoting...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 曾惠敏林富洪
Owner STATE GRID CORP OF CHINA
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