Low-voltage transformer area characteristic current communication synchronization method based on m sequence

A low-voltage station area, communication synchronization technology, applied in the direction of electrical components, distribution line transmission systems, transmission systems, etc., can solve the problems of high transmission current power, frequency domain synchronization is greatly affected by interference, etc., achieve short transmission time, realize Synchronization of current communication, effect of low transmission current amplitude

Pending Publication Date: 2022-07-29
QINGDAO TOPSCOMM COMM +1
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  • Claims
  • Application Information

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Problems solved by technology

However, frequency domain synchronization is greatly affected by interference, and the transmission current power is relatively high

Method used

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  • Low-voltage transformer area characteristic current communication synchronization method based on m sequence
  • Low-voltage transformer area characteristic current communication synchronization method based on m sequence
  • Low-voltage transformer area characteristic current communication synchronization method based on m sequence

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Embodiment Construction

[0032] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to illustrate the present invention, but not to limit the present invention.

[0033] combined with figure 1 , a method for synchronizing characteristic current communication in low-voltage station area based on m-sequence, comprising the following steps:

[0034] Step 1: Generate a 2047-bit m-sequence, and spread the spectrum to obtain a 4094-bit sequence Z.

[0035] Step 2: According to the coding formula:

[0036]

[0037]

[0038] According to equations (1) and (2), the sequence Z is encoded into an 8188-bit synchronous sequence X, where N is 4094 and k is 64; the synchronous sequence X is used to switch the characteristic current, and when the power f...

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Abstract

The invention relates to the technical field of power line power frequency communication, and discloses a low-voltage transformer area characteristic current communication synchronization method based on an m sequence, which comprises the following steps of: 1, generating the m sequence, and performing spectrum spreading on the m sequence to obtain a sequence Z; 2, the sequence is coded into a synchronous sequence X, and the sending end carries out current switching in a low-voltage power supply area according to the synchronous sequence X; step 3, filtering and sampling the current signal by a receiving end; step 4, sampling current data by a sliding window, removing background current, and performing correlation operation on the sampling current data and a coding sequence; 5, setting a synchronization judgment threshold value, when a correlation value meets a threshold value requirement, signal synchronization succeeds, and the step 4 is repeated when synchronization fails; and 6, judging the direction of the current according to positive and negative correlation values after synchronization succeeds. According to the invention, the current communication synchronization function is realized, the current direction can be identified, the relative position of the sending end and the receiving end in the low-voltage transformer area is determined, and the anti-interference capability is improved.

Description

technical field [0001] The invention relates to the technical field of power line power frequency communication, in particular to a method for synchronizing characteristic current communication in a low-voltage station area based on an m-sequence. Background technique [0002] Power line power frequency communication is a communication technology that superimposes tiny distortions on grid voltage or current to transmit information. However, because the power line is not a special communication line, and the complex structure of the low-voltage station area and the harmonics and other noises generated by various power loads will cause great interference to the power frequency communication, especially in the power frequency communication the synchronization part. [0003] Communication synchronization is the basis for the receiver to receive information accurately. At present, communication synchronization is mainly to switch a signal of a specific frequency in the power fre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/54H04B1/7073H04B1/7097
CPCH04B3/54H04B1/7073H04B1/7097
Inventor 严由辉付友涛刘晨郭春旭
Owner QINGDAO TOPSCOMM COMM
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