A method and system for generating switching resistance signals for household transformer relationship identification

Abstract

The invention discloses a method and a system for generating a switching resistance signal for identifying household transformer relationships. The switching resistance signal generation method of the present invention includes: Step 1, analyzing the characteristics of the current signal generated by resistance switching in the low-voltage distribution network; Step 2, determining the sampling frequency and the switching frequency point according to the power consumption of the low-voltage station area ; Step 3, generation of resistance switching signal and determination of duty cycle; Step 4, encoding of resistance switching signal; Step 5, noise processing and signal enhancement by way of load removal; Step 6, detection of transformer secondary side current , conduct frequency domain analysis to determine the relationship between households and households. The current signal generated by the invention can not only effectively filter the noise of the power grid, but also enhance the strength of its own characteristic signal through load removal processing, and has small switching current and stable signal, and has the advantages of simple operation, grid friendliness, and good recognition effect.

Description

technical field [0001] The invention belongs to the field of distribution network automation, relates to using the periodic on-off law of resistance to generate a harmonic current signal of a specific frequency in a low-voltage power grid, and cooperates with a frequency domain analysis method to effectively realize household-change relationship identification. A method and system for generating switching resistance signals for household-change relationship identification. Background technique [0002] The household-to-household relationship is the power supply ownership relationship between each electricity customer in the Taiwan area and the power supply transformer in the Taiwan area. As the terminal level of the development and construction of the smart grid, the Taiwan area involves multiple majors such as marketing and operation inspection, and is the focus and difficulty of power grid management work. It is also the key to the implementation of the "last mile" service...

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

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