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Fault traveling wave filtering method based on characteristic point identification and linear interpolation

A linear interpolation and fault traveling wave technology, applied in the field of power systems, can solve problems such as ineffective elimination of noise fluctuations and inability to overcome calculation errors of signal fluctuations, and achieve good filtering effect, strong purpose, and elimination of fluctuation interference

Active Publication Date: 2018-06-12
ZHONGWEI POWER SUPPLY COMPANY OF STATE GRID NINGXIA ELECTRIC POWER +1
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Problems solved by technology

The focus of these filtering methods is to suppress the amplitude of the noise, but they do not effectively eliminate the fluctuations caused by the noise to the signal. For example, if the HHT algorithm is used, the above filtering methods still cannot overcome the calculation error caused by signal fluctuations.

Method used

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  • Fault traveling wave filtering method based on characteristic point identification and linear interpolation
  • Fault traveling wave filtering method based on characteristic point identification and linear interpolation
  • Fault traveling wave filtering method based on characteristic point identification and linear interpolation

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0033] Such as figure 1 As shown, an actual 10kv distribution network structure schematic diagram is given. When a single-phase ground fault occurs, the fault location method proposed by the present invention is used.

[0034] Among them, point M represents the power supply side of the distribution network, and N represents the end of the line. Points M and N are equipped with voltage transformers and measuring devices, which are used to collect voltage traveling wave signals after faults. C, D, G, H, J, N represent the branch ends, and the three-phase unbalanced load is connected through the transformer. All the lines are overhead bare conductors, and the frequency-varying parameter model is adopted. The length of each line is as follows: figure 1 shown.

[0035] Such as figure 2 As shown, a fault traveling wave filtering method based o...

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Abstract

The invention discloses a fault traveling wave filtering method based on characteristic point identification and linear interpolation, and the method improves the practicality of the power distribution network single-phase grounding fault range finding technology based on HHT. The method comprises the steps: collecting three-phase voltage traveling wave signals of a fault point upstream M end anda fault point downstream N end through a voltage transformer after a fault; carrying out the phase-mode transformation, and obtaining a linear mode voltage traveling wave; carrying out the filtering of the linear mode voltage traveling wave through a filtering algorithm based on the characteristic point identification and linear interpolation; and finally carrying out the fault range finding through a double-end traveling wave range finding method based on HHT. The method can effectively filter the noise in the actual measurement fault voltage traveling signal, and solves a problem that the arrival time of the head of a disturbed traveling wave is not accurate during HHT calibration.

Description

technical field [0001] The invention belongs to the field of power systems, and relates to a single-phase grounding fault traveling wave filtering method of a distribution network, in particular to a fault traveling wave filtering method based on feature point identification and linear interpolation. Background technique [0002] Most of the 10kV medium-voltage distribution network in my country adopts the neutral point non-effective grounding method. After a single-phase ground fault occurs on the distribution line, timely and accurate location of the fault point can not only quickly repair the faulty line, ensure the reliability of power supply and reduce power failure losses, but also play a very important role in ensuring the safety, stability and economic operation of the entire system. role. At present, the single-phase-to-ground fault location methods of distribution network can be mainly divided into traveling wave method, impedance method and injection signal traci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 赵小平代文李永增朱宇辰朱合桥史艳刚
Owner ZHONGWEI POWER SUPPLY COMPANY OF STATE GRID NINGXIA ELECTRIC POWER
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