Ultra high-voltage alternating current transmission line protection method based on all-component differential coefficient matrix

A technology of UHV AC and transmission lines, which is applied in the direction of automatic disconnection emergency protection devices, circuit devices, emergency protection circuit devices, etc., and can solve the problems of enhancing the stability of the power grid and failure to correctly jump out of faults, etc.

Active Publication Date: 2012-09-26
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0005] However, due to the influence of the load current, in the case of a high-resistance grounding short-circuit fault, whether it is the traditional current differential protection that directly uses the magnitude of the vector sum of the currents at both ends as the operating value, or various special protections based on the Beryllon model The new principle of current differential protection of high-volta

Method used

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  • Ultra high-voltage alternating current transmission line protection method based on all-component differential coefficient matrix
  • Ultra high-voltage alternating current transmission line protection method based on all-component differential coefficient matrix
  • Ultra high-voltage alternating current transmission line protection method based on all-component differential coefficient matrix

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Embodiment 1

[0028] figure 1 It is a schematic diagram for applying the method of the present invention to detect faults of UHV AC transmission lines. The fundamental frequency electrical quantities of the m-side substation and the n-side substation are respectively measured by synchrophasor measurement units (Phase Measurement Unit, PMU) installed in the two substations. The synchronized phasor measurement unit measures the three-phase current of the UHV AC transmission line at the detection point of the m substation And phase A positive, negative, zero sequence voltage A phase positive, negative, zero sequence current Measure the three-phase current of UHV AC transmission line at the detection point of substation n And phase A positive, negative, zero sequence voltage A phase positive, negative, zero sequence current as input.

[0029] Utilize the positive, negative and zero-sequence voltages at the detection points of the m substation And positive, negative, zero seque...

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Abstract

The invention discloses an ultra high-voltage alternating current transmission line protection method based on an all-component differential coefficient matrix, comprising the following steps that the fundamental frequency electric amount on both ends of an ultra high-voltage alternating current transmission line is measured; the positive, negative and zero sequence current amount on the other end is calculated from that on one end of the line with a long line equation; the fundamental frequency current amount on the other end is calculated through a symmetrical component method; and then a differential coefficient matrix is calculated. A fault type is judged according to the values of all elements of the differential coefficient matrix, and a fault phase is enabled to be correctly tripped. The method is applicable to protecting the whole fault process of the ultra high-voltage alternating current transmission line; and particularly when the ultra high-voltage alternating current transmission line has a single-phase high-resistance grounding short-circuit fault, the method can accurately identify and correctly trip the fault phase, and circuit breakers on both ends of other two normal phase lines are reliable without working.

Description

technical field [0001] The invention relates to a method for protecting an UHV AC transmission line, in particular to a method for protecting an UHV AC transmission line based on a full component 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. 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 development of gr...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/226H02H3/307H02H7/26
Inventor 曾惠敏王永明郑志煜吴善班佘剑锋潘立志俞书献
Owner STATE GRID CORP OF CHINA
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