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Power distribution network differential protection algorithm based on 5G communication and improved DTW

A technology of differential protection and distribution network, applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc., to achieve the effect of selectivity and quick action

Active Publication Date: 2022-08-05
STATE GRID ANHUI ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, 5G communication is based on wireless transmission, and the real-time performance and reliability of transmission are greatly affected by factors such as weather and obstacles. It is necessary to consider the influence of channel delay and delay jitter on differential protection

Method used

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  • Power distribution network differential protection algorithm based on 5G communication and improved DTW
  • Power distribution network differential protection algorithm based on 5G communication and improved DTW
  • Power distribution network differential protection algorithm based on 5G communication and improved DTW

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Experimental program
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Embodiment 1

[0062] refer to Figures 1 to 2 , is the first embodiment of the present invention, which provides a differential protection algorithm method for distribution network based on 5G communication and improved DTW, including:

[0063] S1: Collect the current amplitude time series at both ends of the grid line within a time window respectively.

[0064] Adopt 5G as the medium of data communication.

[0065] S2: Select the maximum and minimum values ​​of the current amplitude time series for normalization.

[0066] Normalization includes:

[0067]

[0068] where i k is the actual value of the current, i k ' is the normalized current value, i min and i max are the minimum and maximum values ​​of the current amplitude time series, respectively.

[0069] S3: Use the improved DTW algorithm to calculate the DTW distance of the current amplitude time series.

[0070] The differential protection of distribution network based on 5G communication is essentially based on the judgme...

Embodiment 2

[0114] In order to verify and illustrate the technical effect adopted in this method, this embodiment selects different methods and adopts this method to carry out comparative tests, and compares the test results by means of scientific demonstration, so as to verify the real effect of this method.

[0115] The invention adopts PSCAD / EMTDC simulation software to simulate the differential protection model of active distribution network to verify the effectiveness of the method. The model structure is as follows: figure 2 shown.

[0116]One end of the differential protection is simulated by local current sampling, and the other end transmits the signal to the P node through RS485. The P node forwards the data to the Q node through the 5G base station, and uses the Huawei industrial 5G module to simulate the 5G communication delay. Finally, the Q node transmits the data to the Q node. Send it to the simulation software; both power supplies of the model are grounded through a smal...

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Abstract

The invention discloses a power distribution network differential protection algorithm based on 5G communication and improved DTW. The algorithm comprises the steps that current amplitude time sequences at the two ends of a power grid line in a time window are collected respectively; selecting the maximum value and the minimum value of the current amplitude time sequence for normalization; calculating a DTW distance of the current amplitude time sequence by using an improved DTW algorithm; if the DTW distance is larger than an action criterion threshold value, differential protection action is carried out, and otherwise, the steps are carried out again; the 5G communication technology is introduced into the field of power distribution network differential protection, in order to solve the problems of communication time delay and time delay jitter existing in 5G communication, the DTW algorithm is introduced, and a lower bound function, a sorting abandoning strategy and a particle swarm optimization strategy are provided for improvement for the defects that a traditional DTW algorithm is large in expenditure, current sequence waveform is distorted, and parameters are selected depending on experience. The method is applied to the differential protection of the power distribution network under the 5G background, and the selectivity and the quickness of the differential protection are improved.

Description

technical field [0001] The invention relates to the technical field of differential protection of distribution networks, in particular to a differential protection algorithm of distribution networks based on 5G communication and improved DTW. Background technique [0002] In recent years, more and more distributed power sources have been connected to the distribution network. The distribution network is gradually transformed from a traditional radial network to a multi-source and multi-terminal network. The performance requirements of relay protection are becoming more and more stringent, and three-stage current protection is gradually difficult to identify distribution network faults. In order to improve the protection sensitivity, the current differential protection is introduced into the new distribution network. In principle, it is suitable for multi-source network fault problems, and has excellent selectivity, sensitivity and quickness. However, differential protection...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02J13/00G06F17/16
CPCH02H7/262H02J13/00006H02J13/00016H02J13/00022H02J13/00026G06F17/16H02J2203/20Y02E60/00
Inventor 于洋汤伟王同文汪伟张骏俞斌邵庆祝叶远波王栋杨瑞金黄玉辉向欣
Owner STATE GRID ANHUI ELECTRIC POWER