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Protection Method for UHV AC Transmission Line Based on Negative Sequence 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: 2016-11-23
STATE GRID PUTIAN ELECTRIC POWER SUPPLY +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the impact of non-full-phase operation on grid 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

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  • Protection Method for UHV AC Transmission Line Based on Negative Sequence Differential Coefficient Matrix
  • Protection Method for UHV AC Transmission Line Based on Negative Sequence Differential Coefficient Matrix
  • Protection Method for UHV AC Transmission Line Based on Negative Sequence Differential Coefficient Matrix

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Embodiment Construction

[0021] The technical solution of the present invention will be further described in detail according to the accompanying drawings.

[0022] figure 1 It is a schematic diagram of a UHV AC transmission line fault applying the method of the present invention.

[0023] A protection method for UHV AC transmission lines based on negative-sequence differential coefficient matrix, including the following steps:

[0024] (1) The fundamental frequency electrical quantity of the UHV AC transmission line 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 synchronized phasor measuring unit measures the negative voltages of A, B, and C phases of the UHV AC transmission line at the protective installation of the m substation A, B, C phase negative sequence current Measure the A, B, C phase negative sequence currents of UHV AC transmission lines at n subst...

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Abstract

An extra-high voltage alternating-current transmission line protection method based on a negative-sequence differential factor matrix comprises the steps that firstly distribution parameters are adopted for modeling, an A-phase negative-sequence current, a B-phase negative-sequence current, a C-phase negative-sequence current and a negative-sequence differential current amplitude value at the other end of an extra-high voltage alternating-current transmission line are calculated through an A-phase negative-sequence voltage, a B-phase negative-sequence voltage, a C-phase negative-sequence voltage and a negative-sequence current at one end of an extra-high voltage alternating-current transmission line respectively, then the negative-sequence differential factor matrix is calculated, and a fault phase line is distinguished through the relation between all elements of the matrix. According to the method, a distributed parameter model is adopted in a physical model, motion performance is not influenced by distributed capacitance and currents, the method is suitable for any voltage classes and is especially suitable for relay protection of the whole fault process after the extra-high voltage alternating-current transmission line breaks down, the motion performance is not influenced by transitional resistance and load currents, especially when a single-phase high-resistance ground fault happens to the extra-high voltage alternating-current transmission line, the fault phase line can be recognized accurately and reliably, and the relay protection function of tripping off the single-phase fault line through the single-phase line fault is achieved.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a method for protecting UHV AC transmission lines based on negative sequence differential coefficient matrix. Background technique [0002] The UHV AC transmission network can greatly increase the transmission capacity of the power grid, which is beneficial to reduce transmission loss, save transmission costs, save energy and reduce emissions, thereby promoting the development of green energy economy and making the power grid more intelligent, strong, stable and reliable. At the same time, as the backbone network frame of the power grid, after the UHV AC transmission line fails, if the fault cannot be detected in time and correctly isolated, the stability of the power system will be damaged, and the power grid may even collapse, thus causing difficulties to social and economic production. estimated loss. [0003] Because it is not affected by the o...

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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