CN-122002254-A - Bluetooth zero crossing synchronization-based electric energy meter three-phase identification method and system

CN122002254ACN 122002254 ACN122002254 ACN 122002254ACN-122002254-A

Abstract

The invention discloses an electric energy meter three-phase identification method and system based on Bluetooth zero crossing synchronization, and relates to the technical field of electric energy meters. The method comprises the steps that a measuring switch module is connected with at least one electric energy meter module in a Bluetooth mode, the measuring switch module sends a phase identification instruction to the electric energy meter module, the electric energy meter module starts zero-crossing detection according to the Bluetooth connection instruction and sends a zero-crossing data frame to the measuring switch module, and the measuring switch module compares the received zero-crossing data frame with three-phase zero-crossing state words in the measuring switch module in a time matching mode to determine the three-phase type of the electric energy meter module. The method solves the technical problems that an invasive method interferes with a power grid, a non-invasive method is low in accuracy and low in efficiency in the traditional phase identification technology, and achieves the technical effects of realizing rapid, accurate and reliable three-phase identification of the electric energy meter by utilizing the time difference between Bluetooth communication and three-phase zero crossing on the premise of not injecting signals into a power line, improving the accuracy and the identification efficiency of phase identification and reducing the influence on the operation of the power grid.

Inventors

SHEN XUELIANG
LIU HANWEN
QIAN YANJUN
CHU HUAKANG
LI YINGQI
LI JINGJIE

Assignees

杭州西力智能科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260202

Claims (10)

1. The utility model provides an electric energy meter three-phase identification method based on bluetooth zero crossing synchronization which is characterized in that the method comprises the following steps: the measuring switch module and the at least one electric energy meter module establish Bluetooth communication connection; The measuring switch module sends a phase identification instruction to the Bluetooth of the electric energy meter module, the electric energy meter module starts zero crossing event detection according to the phase identification instruction, and the detected zero crossing signal data frame Bluetooth is sent to the measuring switch module; and the measuring switch module determines the three-phase type of the electric energy meter module according to the time matching comparison of the received zero-crossing signal data frame and the three-phase zero-crossing state word in the measuring switch module.
2. The method of claim 1, wherein the time matching comparison of the received zero crossing signal data frame by the metrology switch module to the three-phase zero crossing status word inside the metrology switch module comprises: acquiring a zero crossing state word corresponding to a received zero crossing signal data frame; Performing time matching comparison on the zero crossing state word of the electric energy meter module and the three-phase zero crossing state word in the measuring switch module to obtain a three-phase occurrence time difference value; And determining the three-phase type of the electric energy meter module according to the three-phase occurrence time difference value and a preset judgment time threshold value.
3. The method of claim 2, wherein the preset decision time threshold is less than a time interval corresponding to a phase difference of the three-phase alternating current, the time interval being 6.67ms.
4. The method of claim 1, wherein the interrupt handling mechanism is triggered after the measurement switch module receives a zero crossing signal data frame sent by the power meter module bluetooth; and reading a received zero-crossing signal data frame based on the interrupt processing mechanism, wherein the zero-crossing signal data frame comprises an event identifier for marking a zero-crossing event and a time sequence frame.
5. The method of claim 4, wherein the interrupt handling mechanism comprises a first priority master identification; and the measurement switch module performs priority interrupt processing according to the first priority master control identifier.
6. The method of claim 1, wherein a plurality of power meter modules within a same meter box are acquired, and a plurality of three-phase types corresponding to the plurality of power meter modules are identified; And acquiring the phase distribution relation of the meter box according to the three-phase types.
7. The method of claim 1, wherein after the metrology switch module receives the zero crossing signal data frame, the method further comprises: Constructing a time deviation compensation model, wherein the time deviation compensation model comprises a first time deviation compensation channel and a second time deviation compensation channel, the first time deviation compensation channel is obtained by analyzing time drift characteristic parameters of historical zero crossing event samples, and the second time deviation compensation channel is obtained by analyzing time delay characteristic parameters corresponding to historical Bluetooth receiving and transmitting samples; And compensating the zero-crossing signal data frame received by the measuring switch module according to the first time deviation compensation channel and the second time deviation compensation channel of the time deviation compensation model, and outputting the compensated zero-crossing signal data frame.
8. The method of claim 7, wherein the method of compensating for zero crossing signal data frames received by the metrology switch module according to a first time offset compensation channel of the time offset compensation model comprises: acquiring zero-crossing detection jitter deviation of the electric energy meter module; And compensating the zero-crossing signal data frame received by the measuring switch module according to the zero-crossing detection jitter deviation.
9. The method of claim 7, wherein the compensating the zero crossing signal data frames received by the metrology switch module according to the second time bias compensation channel of the time bias compensation model comprises: Acquiring the Bluetooth receiving and transmitting relative distance between the measuring switch module and the electric energy meter module; and calculating a transmission delay data frame corresponding to the Bluetooth receiving and transmitting relative distance, and compensating the zero crossing signal data frame received by the measuring switch module by using the transmission delay data frame.
10. An electric energy meter three-phase identification system based on bluetooth zero crossing synchronization, which is characterized by being used for implementing the electric energy meter three-phase identification method based on bluetooth zero crossing synchronization as claimed in any one of claims 1-9, and comprising the following steps: the communication establishing unit is used for establishing Bluetooth communication connection between the measuring switch module and at least one electric energy meter module; the measuring switch module sends a phase identification instruction to the Bluetooth of the electric energy meter module, the electric energy meter module starts zero-crossing event detection according to the phase identification instruction, and the detected zero-crossing signal data frame Bluetooth is sent to the measuring switch module; And the time comparison unit is used for determining the three-phase type of the electric energy meter module according to the time matching comparison of the received zero crossing signal data frame and the three-phase zero crossing state word in the measuring switch module.

Description

Bluetooth zero crossing synchronization-based electric energy meter three-phase identification method and system Technical Field The invention relates to the technical field of electric energy meters, in particular to an electric energy meter three-phase identification method and system based on Bluetooth zero crossing synchronization. Background Under the background of rapid development of novel power systems and intelligent distribution and utilization networks, the fine management of low-voltage distribution transformer areas becomes an important means for reducing loss and enhancing efficiency of the power grid. The analysis of the line loss of the transformer area, the calculation of the split-phase line loss and the accurate identification of the topological relation of the power distribution network are highly dependent on the three-phase information accessed by the electric energy meter at the user side. However, in the existing low-voltage distribution system, a large amount of stock and newly-increased electric energy meters record the installation position or meter box information only on the archival level, and the accurate identification of the access condition of the A phase, the B phase or the C phase of the user terminal is lacking, so that the topology of a platform area is unclear, the split-phase statistics is inaccurate, and the improvement of the line loss lean management level is seriously restricted. Aiming at the phase identification problem of the electric energy meter, the prior art mainly comprises two main types of invasive type and non-invasive type. The invasive phase identification method generally judges the phase relation by injecting a specific test signal into the power line, and has high identification accuracy, but can cause interference to the operation of the power grid, increase the complexity of the system and the hardware cost, and is not suitable for large-scale online application. The non-invasive phase identification method is dependent on voltage and current characteristic analysis or long-time data statistical modeling, is easily influenced by load fluctuation, harmonic waves and noise, has the problems of low identification accuracy, long identification period, poor real-time performance and the like, and is difficult to meet the large-scale and high-real-time phase identification requirements of a platform region. Disclosure of Invention The application provides an electric energy meter three-phase identification method and system based on Bluetooth zero crossing synchronization, which solve the technical problems that an invasive method interferes with a power grid in the traditional phase identification technology, and a non-invasive method is low in accuracy and efficiency. The application provides a method for identifying three-phase phases of an electric energy meter based on Bluetooth zero crossing synchronization, which comprises the following steps: The system comprises a measuring switch module, at least one electric energy meter module, a phase identification instruction, a three-phase type determining module and a phase identification module, wherein the measuring switch module is connected with the at least one electric energy meter module in a Bluetooth communication mode, the measuring switch module sends the phase identification instruction to the electric energy meter module Bluetooth, the electric energy meter module starts zero-crossing event detection according to the phase identification instruction, sends a zero-crossing signal data frame Bluetooth obtained through detection to the measuring switch module, and the measuring switch module determines the three-phase type of the electric energy meter module according to time matching comparison of the received zero-crossing signal data frame and a three-phase zero-crossing state word inside the measuring switch module. In a second aspect of the present application, there is provided an electric energy meter three-phase identification system based on bluetooth zero crossing synchronization, the system comprising: The system comprises a communication establishing unit, a zero-crossing event detecting unit, a time comparing unit and a time comparing unit, wherein the measuring switch module is used for establishing Bluetooth communication connection with at least one electric energy meter module, the zero-crossing event detecting unit is used for sending a phase identification instruction to the Bluetooth of the electric energy meter module, the electric energy meter module starts zero-crossing event detection according to the phase identification instruction and sends a detected zero-crossing signal data frame Bluetooth to the measuring switch module, and the measuring switch module is used for determining the three-phase type of the electric energy meter module according to the time matching comparison of the received zero-crossing signal data frame and the three-phase zero-crossing status wo