Power line two-way power-frequency communication uplink signal detecting method

A signal detection, two-way power frequency technology, applied in the direction of line transmission monitoring/testing, line transmission components, etc., can solve the problems of inability to perform accurate time-frequency analysis, loss of information, etc., to remove noise and harmonic interference, reduce The effect of high calculation amount and high detection accuracy

Inactive Publication Date: 2015-01-28
STATE GRID CORP OF CHINA +2
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Problems solved by technology

Two-way power frequency communication uplink signal detection is to detect small signals in the background, the traditional detection method is the time domain detection method, this method will lose a lot of useful information, has certain requirements for the power grid, has certain limitations, the...

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  • Power line two-way power-frequency communication uplink signal detecting method
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  • Power line two-way power-frequency communication uplink signal detecting method

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Embodiment Construction

[0026] A power line two-way power frequency communication uplink signal detection method of the present invention will be further specifically described below in conjunction with the accompanying drawings.

[0027] A power line two-way power frequency communication uplink signal detection method of the present invention comprises the following steps:

[0028] 1. Weighted and summed signals to eliminate background signals

[0029] 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 the where I A , I B , I C It is the three-phase current in the distribution network, which can eliminate most of the influence of the fundamental current and at the same time double the signal;

[0030] 2. Deriving the weighted and summed communication signal

[0031] Such as figure 2 As shown in the equivalent circuit schematic diagram of the two-way power frequency...

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Abstract

The invention discloses a power line two-way power-frequency communication uplink signal detecting method. The method is characterized by including the steps of firstly, making background power-frequency signals of modulating signals cancelled out and enhancing the modulating signals through a weighted summation method in the two-way power-frequency communication uplink signal detecting process, conducting derivation on the enhanced modulating signals, and conducting empirical mode decomposition on the modulating signals through ensemble empirical mode decomposition; secondly, finding the order, where the frequency of 150 HZ to 500 HZ is located, in an n-order intrinsic mode function through correlation operation, finding the threshold value of a corresponding order through the intrinsic mode function of the order where the frequency of 150 HZ to 500 HZ is located, conducting threshold value denoising, and calculating the Hilbert marginal spectrum of the denoised signals through Hilbert conversion, and therefore the time domain where the modulating signals are located is detected, most noise and harmonic interference can be effectively removed, and the time domain where the modulating signals are located can be accurately detected. The method has the advantages of being scientific, reasonable, easy to implement, high in detection accuracy and the like.

Description

technical field [0001] The invention relates to a signal detection method for power line carrier communication, more specifically, a method for detecting uplink signals of power line two-way power frequency 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. The system uses the power line as the data transmission carrier and uses the zero-crossing modulation principle to realize signal modulation. The power frequency communication uplink signal is passed through the switch of the thyristor. Controlling the distorted current pulse signal generated near the zero-crossing point of the fundamental voltage signal is a time-varying signal whose frequency spectrum changes with time. Two-way power frequency communication uplink signal detection is to detect small signals in the background, the traditional detection method is the time domain detection metho...

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Application Information

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IPC IPC(8): H04B3/46
Inventor 赵亮隋吉生王圣达丛犁陈晓娟赵迎会王晓辉
Owner STATE GRID CORP OF CHINA
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