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Switching resistance signal generation method and system for identification of user-transformer relationship

A technology of relationship identification and signal generation, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as the inability to guarantee the success rate and accuracy of identification, the problem of clustering areas, grid voltage, and current fluctuations, etc. To achieve the effect of grid-friendly, low power consumption, and low switching current

Active Publication Date: 2019-12-03
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the identification methods of household change relationship mainly include the following categories: (1) manual line inspection method, which is only suitable for overhead line station areas with simple and visible wiring; (2) power failure identification method, which requires temporary power failure on the user side, which affects the user's power consumption ; (3) The method based on carrier communication cannot guarantee the success rate and accuracy of recognition, and cannot solve the problem of cross-station area; (4) The method based on data correlation has a large amount of data communication, which is affected by clock synchronization error, sampling error, etc. Factors have great influence; (5) The power frequency distortion method has a high identification success rate, but it will cause short-term sharp fluctuations in the voltage and current of the grid, which is easy to cause damage to the grid

Method used

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  • Switching resistance signal generation method and system for identification of user-transformer relationship
  • Switching resistance signal generation method and system for identification of user-transformer relationship
  • Switching resistance signal generation method and system for identification of user-transformer relationship

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Embodiment 1

[0039] refer to figure 1 , the present invention is a kind of switching resistance signal generation method that is used for household change relation identification, comprises the following steps:

[0040] (1) Analyze the characteristics of the current signal generated by resistor switching in the low-voltage distribution network. In the power frequency 50Hz voltage network, the fixed resistance resistor is controlled by the switch at the switching frequency f c Periodic on and off will generate five current signals in the grid, including 50Hz current signals, at f c Two frequencies are generated at 50Hz on both sides as f 1 , f 2 The harmonic current satisfies f 2 -f c = f c -f 1 =50Hz,A 1 =A 2 , at 2f c Two frequencies are generated at 50Hz on both sides as f 3 , f 4 The harmonic current satisfies f 3 -2f c = 2f c -f 4 =50Hz,A 3 =A 4 , where A represents the signal strength. If a resistor with a resistance value of 311Ω is selected for switching, the peak ...

Embodiment 2

[0060] This embodiment provides a switching resistance signal generation system for household variable relationship identification, which includes:

[0061] Switching signal characteristic analysis unit: analyze the characteristics of the current signal generated by resistance switching in the low-voltage distribution network;

[0062] Sampling frequency and switching frequency point determination unit: determine the sampling frequency and switching frequency point according to the electricity consumption in the low-voltage station area;

[0063] Signal generation and duty ratio determination unit: used for the generation of resistance switching signals and the determination of duty ratio;

[0064] Encoding unit: used for encoding of resistance switching signals;

[0065] Noise processing and signal enhancement unit: perform noise processing and signal enhancement by unloading;

[0066] Household transformer relationship determining unit: by detecting the secondary side curr...

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Abstract

The invention discloses a switching resistance signal generation method and system for identification of user-transformer relationship. The switching resistance signal generation method comprises thefollowing steps: 1) analyzing characteristics of current signals generated in a low-voltage power distribution network in a resistance switching mode; 2) determining sampling frequency and a switchingfrequency point according to power consumption information of a low-voltage transformer area; 3) generating a resistance switching signal and determining a duty ratio; 4) encoding the resistance switching signal; 5) carrying out noise processing and signal enhancement in a load removal mode; and 6) carrying out frequency domain analysis by detecting the secondary side current of the transformer,and determining the user-transformer relationship. The current signal generated by the method not only can effectively filter the noise of a power grid, but also can enhance the characteristic signalstrength of itself through load removal processing; switching current is small and the signal is stable; and the method and system have the advantages of being simple to operate, friendly to the powergrid and good in recognition effect.

Description

technical field [0001] The invention belongs to the field of distribution network automation, and relates to generating a harmonic current signal of a specific frequency in a low-voltage power grid by using the periodic on-off rule of resistance, and cooperates with the frequency domain analysis method to effectively realize the identification of household transformer relationships. A method and system for generating a switching resistance signal for household transformer relationship identification. Background technique [0002] The household substation relationship is the power supply relationship between each electricity customer in the station area and the power supply transformer in the station area. As the end level of the development and construction of the smart grid, the station area involves marketing, transportation inspection and other majors, and is the focus and difficulty of power grid management. , It is also the key to the implementation of the "last mile" s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16G01R31/00
CPCG01R23/16G01R31/00
Inventor 徐英辉王伟峰陆春光李熊姜洪浪王晓东
Owner CHINA ELECTRIC POWER RES INST
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