A court identification system and identification method based on broadband power line carrier and power frequency communication

Abstract

The invention discloses a court identification system and identification method based on broadband power line carrier and power frequency communication. The system comprises a background system host,a concentrator, a court identification collector and a court identification receiver; the court area identification collector comprises a first micro-control unit, a first zero-crossing detection circuit for detecting zero-crossing time of a live wire relative to a zero line at the position where the intelligent electric meter is connected to a power grid, and a power frequency communication transmitting circuit connected between the live wire and the zero line at the position where the intelligent electric meter is connected to the power grid; the courtidentification receiver includes a Second micro-control unit, the second zero-crossing detection circuit used for detecting the zero-crossing time of the three-phase line relative to the zero line at the low-voltage bus of the power transformer, and the power frequency communication receiving circuit for detecting current magnitude data of a three-phase line at a low-voltage bus of the power transformer; and the court identification collector and the court identification receiver are respectively in communication connection with the concentrator through a first communication module and a second communication module. The court identification system is networked through the hplc communication technology and can be conveniently integrated with an hplc centralized meter reading system, and remote operation can be achieved.

Description

technical field [0001] The invention relates to a power supply station area identification technology, in particular to a household variable relationship / station area identification system. Background technique [0002] Due to the limitation of environmental conditions, different years of power grid construction, and different meter reading technologies, the affiliation relationship between the energy meter and the power supply transformer has always been confused. It is necessary for the power grid company to analyze the line loss of the station area and the power distribution. Here comes the trouble. In recent years, with the application of broadband power line carrier technology in the local communication scheme of centralized copying, the phenomenon of confusion between stations and districts has become more and more serious. The reason is that the fundamental frequency of broadband power line carrier communication is relatively high. , in the case of a common cable tre...

AI Technical Summary

Problems solved by technology

This method uses the zero-crossing time base and the strength of the broadband carrier communication signal sent by the concentrator as the basis for station area identification, but when there are many inductive loads / capacitive loads in the power grid Before and after the on-site reactive power compensation equipment, the zero-crossing point is easily affected by inductance and capacitance, and the time variation range is large, which will adversely affect the accuracy of identification

Moreover, broadband carrier communication is generally a frequency band where the fundamental frequency of communication modulation is 1MHz and above. At such a high frequency, there will be mutual crosstalk in the case of a common cable trench, and the capacitive loads of different transformers and low-voltage power grids are different. , the degree of attenuation caused by the high-frequency carrier signal is different. There may be a carrier signal that the energy meter can receive with a strong signal but not from the concentrator that is actually subordinate to the transformer. In extreme cases, it may even not receive the carrier signal from the real transformer. The carrier signal of the concentrator, but the carrier signal of the concentrator of other transformers, still has the problem that it cannot be accurately identified

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