A detection method for power line two-way power frequency communication

A technology of two-way power frequency and detection method, which is applied in distribution line transmission system, line transmission monitoring/testing, line transmission parts and other directions, can solve the problem of high bit error rate, communication interruption and poor effect of two-way power frequency communication system and other problems, to achieve the effect of improving detection performance, reducing the impact of noise interference, and reducing the amount of calculation.

CN108768452BActive Publication Date: 2021-08-24RES INST OF ECONOMICS & TECH STATE GRID SHANDONG ELECTRIC POWER +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-08-24

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Abstract

The invention discloses a detection method for power line two-way power frequency communication, which belongs to the technical field of electric power communication. It includes weighting and summing the signal to eliminate the background signal; deriving the weighted and summed communication signal; performing EEMD decomposition on the processed signal; measuring the frequency of each IMF; and performing threshold denoising on the reserved IMF. It solves the problem of poor effect of the two-way power frequency communication system in the noise environment, and can be effectively applied to the communication environment with high harmonic noise power. At the same time, it can continuously improve the detection performance of the uplink signal and greatly reduce the impact of noise interference.
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Description

technical field

[0001] The invention relates to a detection method for power line two-way power frequency communication, which belongs to the technical field of power communication. Background technique

[0002] The two-way power frequency communication system is a new communication system based on the power distribution network in recent years. At present, the two-way power frequency communication adopts the master-slave mode, and the uplink communication cannot be carried out independently. It adopts the time-domain difference algorithm, which has certain requirements for the noise environment of the power line distribution network. When there are strong interference signals and sudden interference noises in the distribution network, the bit error rate of the two-way power frequency communication system will be very high, even enough to interrupt the communication, and the effect is not good.

[0003] Aiming at the above existing technical conditions, the applicant of the...

Examples

Embodiment Construction

[0052] The present invention will be further specifically described below in conjunction with the accompanying drawings.

[0053] Such as Figures 1 to 5 As shown, a detection method for power line two-way power frequency communication includes the following steps:

[0054] 1. Weighted and summed signals to eliminate background signals

[0055]

[0056] Power frequency communication uplink signal detection is to extract the weak current in the background, so the weighted summation is used to cancel the power frequency signal, and IA, IB, IC are the three-phase currents in the distribution network, which can eliminate most of the fundamental waves Influenced by current, at the same time, the signal is enhanced by 1 times;

[0057] 2. Deriving the weighted and summed communication signal

[0058] Such as figure 2As shown in the equivalent circuit schematic diagram of the two-way power frequency communication uplink modulation signal modulation, the uplink signal transmit...