Rapid bus protection method based on comparison of similarity of contrary motion waveforms

A technology of waveform similarity and busbar protection, applied in emergency protection circuit devices, electrical components, etc., to achieve the effect of anti-TA saturation, easy to set, and fast action.

Active Publication Date: 2018-09-21
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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Problems solved by technology

However, it is still difficult to accurately determine whether it is an internal fault or an external fault.

Method used

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  • Rapid bus protection method based on comparison of similarity of contrary motion waveforms
  • Rapid bus protection method based on comparison of similarity of contrary motion waveforms
  • Rapid bus protection method based on comparison of similarity of contrary motion waveforms

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specific Embodiment

[0085] In order to test the rationality of the busbar protection method compared with the similarity of the reverse traveling wave waveform, the present invention utilizes PSCAD / EMTDC to build such as figure 1 The shown 500KV bus system model is used for fault simulation research, in which the bus stray capacitance C m =0.01μF, the sampling frequency is 200kHz, L 1 =L 3 = 250km, L 2 = 320km, L 4 =270km, L 5 = 300km. Select the initial reverse traveling wave signal corresponding to 60kHz after the S-transformation, and use the Euclidean distance to calculate the similarity.

[0086] (1) The simulation is set to the internal fault of the bus

[0087] Let the bus (M fault point be F 1 ) A phase-to-ground short circuit occurs, and the initial fault angle is 45°. Based on the above analysis, the energy entropy of the given single-frequency anti-traveling wave at the corresponding moment of the initial traveling wave head can be calculated, and:

[0088]

[0089] C Sj s...

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Abstract

The invention discloses a rapid bus protection method based on comparison of similarity of contrary motion waveforms. The rapid bus protection method comprises the following steps: respectively reading the three-phase current of a bus and the original data of current at an end close to the bus, of an association circuit; carrying out phase-mode transformation on the three-phase current and the current at the end close to the bus by using a composite modulus method; respectively carrying out S transformation on corresponding initial voltage current motion waves so as to obtain S transformationcomposite matrixes; extracting reverse motion waves, and acquiring Euclidean distances of reverse motion waveform signals after faults of different association circuits; calculating the similarity ofdifferent circuits by using the Euclidean distances of the reverse motion wave signals of different association circuits; establishing protection criterions, and judging internal faults and external faults. By adopting the rapid bus protection method, by analyzing the similarity of waveforms of reverse motion waves of different association circuits after S transformation, internal faults and external faults of a bus area can be recognized, influence of factors such as transition resistance and initial angles of faults are generally overcome, internal faults and external faults of the bus areacan be accurately recognized, good interference resistance can be achieved, and rapid protection recover of buses can be facilitated.

Description

technical field [0001] The invention relates to a busbar protection method, in particular to a fast busbar protection method based on the similarity comparison of reverse traveling wave waveforms. Background technique [0002] Bus fault is one of the most serious faults in the power system. Bus protection is an important system equipment to ensure the safe and stable operation of the power grid. Its safety, reliability, sensitivity and rapidity are of decisive significance to ensure the safety of the entire regional power grid. In order to prevent serious consequences that may be caused by busbar faults, it is necessary to set up reliable and good-performance busbar protection so that it can quickly detect where the busbar fault is located. [0003] Busbar protection can be divided into power frequency protection and transient protection according to the principle. Among them, power frequency protection is the most widely used current differential protection. The medium pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22
Inventor 彭倩吴浩常政威乐英高曾奕董星星
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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