User-transformer relationship identification method based on multi-carrier frequency modulation characteristic identification signal

Abstract

The invention provides a user-transformer relationship identification method based on a multi-carrier frequency modulation characteristic identification signal, which is characterized in that a clockof a user ammeter and an intelligent fusion terminal is corrected and unified through clock time synchronization, and then user change relationship identification is carried out through an identification characteristic signal of multi-carrier frequency modulation. Through the operation, the accuracy and success rate of a user-transformer relationship are improved, and meanwhile, accurate time synchronization between the intelligent fusion terminal and the user electric meter is realized.

Description

technical field [0001] The invention belongs to the technical field of distribution network phase recognition, and in particular relates to a household transformer relationship recognition method based on multi-carrier frequency modulation characteristic recognition signals. Background technique [0002] In the existing technology, based on the HPLC high-speed carrier wave technology of the electric meter, the identification of the relationship between households and transformers uses the orthogonal frequency division multiplexing feature code technology to realize the identification of the relationship between households and electric meters between the collector and the user's electric meter. However, due to the OFDM signal modulation signal, the channel is divided into several orthogonal sub-channels, the high-speed data signal is converted into parallel low-speed sub-data streams, and modulated to transmit on each sub-channel. If the transmission distance is too long , Th...

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Problems solved by technology

[0009](1) In the power outage method to verify the relationship between households and transformers, due to the large attenuation of remote signals in HPLC high-speed carrier communication, many normal working meters cannot achieve communication, resulting in During the power outage detection process, the meter is also regarded as a power outage, resulting in inaccurate identification of household transformer relationships

[0010](2) The high-speed carrier method is used to verify the relationship between the household transformers. Since various types of ammeters are used in the distribution station area, the clock crystal oscillator components of the ammeters adopt Different, the resulting time inconsistency between the energy meter and the intelligent fusion terminal. At the same time, the HPLC high-speed carrier of the energy meter uses the flooding method for dynamic networking and routing. The networking path and relay link depend on the dynamic changes of the current communication environment and cannot be accurately predicted. Routing delay time, after the meter receives the time synchronization command, the time difference will be 10 seconds, while the voltage cycle is 20mS, and the phase difference time is 6.67ms. Such time synchronization accuracy cannot realize accurate household variable relationship identification

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