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UHV AC Transmission Line Relay Protection Method Based on Differential Coefficient Matrix

An ultra-high voltage AC and transmission line 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: 2016-08-24
STATE GRID PUTIAN ELECTRIC POWER SUPPLY +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • UHV AC Transmission Line Relay Protection Method Based on Differential Coefficient Matrix
  • UHV AC Transmission Line Relay Protection Method Based on Differential Coefficient Matrix
  • UHV AC Transmission Line Relay Protection Method Based on Differential Coefficient Matrix

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Embodiment Construction

[0035] figure 1 It is a schematic diagram of a UHV AC transmission line fault applying the method of the present invention. The fundamental frequency electrical quantities of UHV AC transmission lines at the protective installations of the m-side substation and the n-side substation are respectively measured by the phase measurement unit (PMU) installed in the two substations. The synchrophasor measuring unit measures the positive sequence voltages of A, B, and C phases of UHV AC transmission lines at the protective installation of substation m A, B, C phase positive sequence current Measure the positive sequence currents of A, B, and C phases of UHV AC transmission lines at the protective installation of substation n

[0036] The synchronized phasor measuring unit measures the negative sequence voltages of A, B, and C phases of UHV AC transmission lines at the protective installation of substation m A, B, C phase negative sequence current Measure the A, B, C phase n...

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Abstract

The invention discloses a method for relay protection of UHV AC transmission lines based on a differential coefficient matrix, and relates to the technical field of relay protection for power systems. It first measures the positive-sequence voltage, positive-sequence current, negative-sequence voltage, and negative-sequence current of A, B, and C phases at one end of the UHV AC transmission line; uses the distributed parameter model to calculate the A, B, and C phases at the other end of the UHV AC transmission line. The positive-sequence current and negative-sequence current of phase C respectively calculate the differential current amplitudes of the mixed system components of phases A, B, and C, and then calculate the differential coefficient matrix, and then use the size relationship between the elements of the differential coefficient matrix to judge UHV AC Transmission line fault phase. The method of the present invention is not affected by the distributed capacitance current, and is applicable to any voltage level, especially the UHV AC transmission line; it is used for the relay protection of the entire fault process after the UHV AC transmission line fails, and the operating performance is not affected by the transition resistance and load influence of current.

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 AC transmission lines based on 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 the developm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 曾惠敏林富洪
Owner STATE GRID PUTIAN ELECTRIC POWER SUPPLY
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