Device and method for detecting phase information of electric energy meter based on dual-mode acquisition communication equipment

Abstract

The invention discloses a device and method for detecting phase information of an electric energy meter based on dual-mode acquisition communication equipment, and the device comprises a central coordinator which is used for network configuration and networking, guarantees the mutual communication between equipment, and transmits the phase information of the acquisition communication equipment; the acquisition communication equipment acquires power grid phase information from the central coordinator after network access is successful, and broadcasts the phase information and zero-crossing information of the acquisition communication equipment through an RS-485 communication protocol; and the plurality of electric energy meters are used for receiving and collecting the phase information and the zero-crossing information of the communication equipment, and calculating the phase information of the electric energy meters by detecting zero-crossing signals of the electric energy meters and combining the phases of the communication equipment. According to the invention, mode expansion can be carried out on the basis of the existing RS-485 communication interface, the collected zero-crossing information of the communication equipment is stably synchronized to the electric energy meter, the electric energy meter calculates the phase information by combining the zero-crossing information of the electric energy meter, and the technical scheme of the invention is simple and reliable and occupies few resources.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power communication, and in particular to a device and method for detecting phase information of an electric energy meter based on a dual-mode acquisition communication device. Background Art

[0002] In modern power communication systems, accurate transmission of information is crucial to the stable operation of the power grid. As an efficient means of communication, high-speed power line carrier (HPLC) technology has been widely used in power systems. HPLC technology realizes data transmission through power line carrier, but its communication range is usually limited to the power line connected to the acquisition communication equipment. In order to further expand the communication network, dual-mode communication technology came into being. It combines HPLC and micro-power wireless communication to form a dual-mode communication technology that can realize communication on the power line through hybrid networking of power line carrier and wireless mode.

[0003] Although dual-mode communication technology has made some progress in the field of communication, there are still some challenges in the application of communication modules of acquisition communication equipment. In particular, the existing communication modules of acquisition communication equipment can only identify the phase sequence information of the electrical lines directly connected to them, and the phase sequence identification of downstream electric energy meters is still a technical problem. At present, in order to solve this problem, researchers have tried a variety of methods, including using big data technology for pattern recognition and adding additional communication methods such as Bluetooth, Wi-Fi, etc. However, these methods have obvious limitations. Big data methods require the processing and analysis of huge data sets, which not only increases the computational burden but also prolongs the response time. The added wireless communication methods may be subject to signal interference, affecting the stability and reliability of communication, and these methods perform poorly in terms of test accuracy and stability.

[0004] In addition, these methods often consume a lot of resources during implementation, including hardware costs, energy consumption, and maintenance work. Therefore, developing a new phase sequence identification method that can provide high-precision identification results while maintaining communication stability and reducing resource consumption has become an urgent need in the field of power communication. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a device and method for detecting phase information of an electric energy meter based on a dual-mode acquisition communication device.

[0006] In order to achieve the above object, the present invention provides a device for detecting phase information of an electric energy meter based on a dual-mode acquisition communication device, comprising:

[0007] Central coordinator, used for network configuration and networking, ensuring that devices can communicate with each other, and sending and collecting phase information of communication devices;

[0008] The communication equipment acquires the grid phase information from the central coordinator after successful access to the grid, and broadcasts its phase information and zero-crossing information through the RS-485 communication protocol;

[0009] Multiple electric energy meters are used to receive the phase information and zero-crossing information of the acquisition communication equipment, detect the zero-crossing signal by themselves, and calculate their own phase information in combination with the phase of the acquisition communication equipment.

[0010] Preferably, the acquisition communication device and the electric energy meter communicate with each other via an RS-485 interface, and the acquisition communication device and the electric energy meter support two modes:

[0011] Normal mode, in which the acquisition communication device and the energy meter send data according to the serial communication protocol;

[0012] Zero-crossing synchronization mode, in which the acquisition communication equipment and the electric energy meter enter the timing receiving and sending mode to synchronize the zero-crossing information.

[0013] Preferably, the acquisition communication device can change the RS-485 communication mode in the zero-crossing synchronization mode to synchronize the zero-crossing information to the downstream electric energy meter in real time, and the accuracy of the process can be controlled at the microsecond level.

[0014] Preferably, after receiving the zero-crossing signal from the acquisition communication device, the electric energy meter starts a high-precision timer to record the zero-crossing moment, and records the moment when the zero-crossing signal on the power line is detected to calculate the zero-crossing cycle difference.

[0015] The present invention also provides a method for detecting phase information of an electric energy meter based on a dual-mode acquisition communication device, comprising the following steps:

[0016] Step S1: Use the central coordinator to configure and network the network to ensure that the devices can communicate with each other and send and collect phase information of the communication devices;

[0017] Step S2: After the communication device successfully accesses the network, it actively obtains its grid phase information from the central coordinator;

[0018] Step S3: the acquisition communication device broadcasts its phase information using the RS-485 communication protocol and notifies the electric energy meter to prepare to detect the zero-crossing signal;

[0019] Step S4: The acquisition communication device converts the detected zero-crossing signal into a square wave signal and sends it to the electric energy meter through the RS-485 line;

[0020] Step S5: the electric energy meter enters the zero-crossing detection mode, starts the internal timer, and records the zero-crossing time T1 of the acquisition communication device and the zero-crossing signal time T2 of the power line;

[0021] Step S6: the electric energy meter calculates the phase of the electric energy meter according to the zero-crossing period difference between T1 and T2 and the phase information of the collected communication device;

[0022] Step S7: The acquisition communication device sequentially obtains the phase information of the electric energy meter through RS-485 instructions.

[0023] Preferably, in step S3, the acquisition communication device and the electric energy meter enter the zero-crossing detection mode together, and the acquisition communication device simultaneously pulls up the TX GPIO pin when acquiring the zero-crossing signal, while the electric energy meter starts a high-precision timer to record the zero-crossing moment.

[0024] Preferably, in step S5, if the electric energy meter obtains more than 30 valid standard zero-crossing information continuously, the detection data is considered valid; otherwise, the detection data is lost.

[0025] Preferably, in step S6, the electric energy meter calculates its own phase information according to the power cycle of 20 ms and the phase difference between the three phases of X or 2X.

[0026] Preferably, in step S6, if the difference between T1 and T2 is within plus or minus 500 μs, it is determined that the acquisition communication device and the electric energy meter are in phase; if the difference between T1 and T2 is within plus or minus 500 μs of X, it is determined that there is a phase difference; if the difference between T1 and T2 is within plus or minus 500 μs of 2X, it is determined that there is a phase difference; if the difference between T1 and T2 exceeds 500 μs, it is determined that the detection has failed.

[0027] Preferably, the detection process in step S4 lasts for 3 seconds, and the detection process in step S5 lasts for 2 seconds;

[0028] In step S4 and step S5, the detection can be performed simultaneously on the entire RS-485 network by broadcasting, so as to improve the detection efficiency and reduce the impact on the system.

[0029] The technical solution of the present invention has the following beneficial effects:

[0030] The present invention synchronizes zero-crossing information based on the RS-485 interface between the acquisition communication device and the electric energy meter. The acquisition communication device obtains its own phase information through CCO; then the acquisition communication device synchronizes the phase information to the downstream electric energy meter. The acquisition communication device and the downstream electric energy meter agree to have two modes: one is a normal mode, that is, the working mode of the existing acquisition communication device and the electric energy meter; the other is a zero-crossing synchronization mode, that is, the acquisition communication device synchronizes the zero-crossing information to the electric energy meter in real time through the RS-485 line; after the acquisition communication device synchronizes the zero-crossing information to the downstream electric energy meter in real time, the downstream electric energy meter detects zero-crossing by itself and calculates its own phase information in combination with the phase of the acquisition communication device.

[0031] The present invention can perform mode expansion on the basis of the existing RS-485 communication interface, and stably synchronize the zero-crossing information of the acquisition communication equipment to the electric energy meter, and the electric energy meter calculates the phase information based on its own zero-crossing information. The technical solution of the present invention is simple and reliable, and occupies less resources; compared with the existing phase recognition scheme, it has great resource advantages and cost advantages. The present invention realizes accurate detection and recognition of the phase information of the electric energy meter by accurately synchronizing the zero-crossing information between the dual-mode acquisition communication equipment and the electric energy meter, which is of great significance to the management and control of the power system.

[0032] The present invention realizes real-time zero-crossing information synchronization between the acquisition communication equipment and the downstream electric energy meter by changing the existing RS-485 communication mode, and the accuracy can be controlled at the microsecond level, which significantly improves the accuracy of phase sequence identification.

[0033] Compared with the big data recognition method, the present invention does not need to process and analyze huge data sets, thereby reducing the consumption of computing resources. Zero-crossing information synchronization is performed through the RS-485 interface, avoiding the signal interference problem that may be encountered in wireless communication and improving the stability of communication.

[0034] The downstream electric energy meter of the present invention detects zero crossing by itself and quickly calculates its own phase information in combination with the phase where the communication device is collected, thereby improving the detection efficiency.

[0035] The present invention does not need to add additional communication methods, such as Bluetooth, Wi-Fi, etc., which reduces the cost of the system. The present invention can more effectively manage and allocate power resources, reduce energy waste, and improve energy efficiency through accurate phase difference detection and determination. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the module of the present invention;

[0037] Figure 2 is a flow chart of the method of the present invention;

[0038] Figure 3 It is a schematic diagram showing that the acquisition communication device of the present invention and the electric energy meter are in the same phase;

[0039] Figure 4 It is a schematic diagram of a phase difference between the acquisition communication device of the present invention and the electric energy meter;

[0040] Figure 5 It is a schematic diagram of the phase difference between the communication device and the electric energy meter of the present invention which is two phases. DETAILED DESCRIPTION

[0041] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0042] Reference Figures 1 to 5The present invention provides a device for detecting phase information of an electric energy meter based on a dual-mode acquisition communication device, comprising:

[0043] The central coordinator (CCO) is used for network configuration and networking, ensuring that devices can communicate with each other and sending phase information of acquisition communication equipment, which simplifies the equipment configuration and maintenance process and reduces the complexity of operation. CCO can uniformly manage and coordinate the communication between various acquisition communication devices and electric energy meters, improve the communication efficiency and accuracy of the system, and CCO can easily add or remove devices in the network, enhancing the scalability and flexibility of the system. CCO uniformly sends phase information, avoiding errors caused by inconsistent communication between devices and ensuring the consistency and accuracy of phase information.

[0044] The acquisition communication device obtains the grid phase information from the central coordinator CCO after successful access to the network, and broadcasts its phase information and zero-crossing information through the RS-485 communication protocol; wherein the acquisition communication device uses the RS-485 communication protocol to broadcast its phase information, and notifies the electric energy meter to prepare to detect the zero-crossing signal - the zero point moment when the voltage on the power line changes from negative to positive, and at the same time agrees with the electric energy meter to enter the zero-crossing detection mode together. The acquisition communication device converts the zero-crossing signal into a square wave signal, and sends it to the RS-485 line through the MCU TX and RX GPIO; the acquisition communication device enters the zero-crossing detection mode as agreed, converts the detected zero-crossing signal into a square wave signal - the positive half axis is 1, the negative half axis is 0, and sends it to the electric energy meter through the RS-485 transmission line. The whole detection process lasts for 3s, and then returns to the normal RS-485 communication mode. In this embodiment, the phase information of the grid is obtained from the central coordinator CCO after the acquisition communication device successfully accesses the network, which ensures the accuracy and consistency of the phase information held by the acquisition communication device. This centralized management method reduces the errors caused by inconsistent multi-source information and improves the communication accuracy of the entire system. The acquisition communication device broadcasts its phase information and zero-crossing information through the RS-485 communication protocol, allowing downstream electric energy meters to receive these critical synchronization signals in real time. This real-time communication mechanism is essential to ensure the accuracy of power system measurement and control. Since the acquisition communication device can obtain phase information from the CCO, it can still provide accurate phase information even when some parts of the network fail. The acquisition communication device automatically obtains phase information from the CCO and broadcasts it to the electric energy meter, reducing the need for manual intervention and improving the automation of the system.

[0045] Multiple electric energy meters are used to receive phase information and zero-crossing information from the acquisition communication device, and calculate their own phase information by detecting the zero-crossing signal by themselves and combining the phase of the acquisition communication device; multiple electric energy meters can receive phase information and zero-crossing information from the acquisition communication device, and detect the zero-crossing signal by themselves, which enables the electric energy meters to perform phase calculation synchronously, thereby improving the synchronization accuracy of the entire system; by combining the phase information of the acquisition communication device and the zero-crossing signal detected by the electric energy meter itself, each electric energy meter can calculate its own phase information more accurately, and multiple electric energy meters can independently verify and calculate the phase information, which means that even if a certain electric energy meter fails, other electric energy meters can still continue to work normally, thereby improving the reliability of the entire system. By providing accurate phase information, these electric energy meters support advanced smart grid technologies such as demand response, distributed generation, and electric vehicle charging management. Accurate phase information helps optimize energy use and reduce energy waste, especially during peak hours, so that electricity can be more efficiently distributed to meet demand. For end users, accurate phase information and zero-crossing signal detection can reduce power outages and voltage fluctuations, thereby providing a more stable and reliable power supply.

[0046] Furthermore, the acquisition communication device and the electric energy meter communicate with each other via an RS-485 interface, and the acquisition communication device and the electric energy meter support two modes:

[0047] Normal mode, in which the acquisition communication device and the energy meter send data according to the serial communication protocol;

[0048] Zero-crossing synchronization mode, in which the acquisition communication equipment and the electric energy meter enter the timing receiving and sending mode to synchronize the zero-crossing information.

[0049] Normal mode: It is essentially a serial communication protocol. Data (start bit, data bit, check bit, stop bit) is sent according to the serial port protocol. In addition, the user-defined protocol is added. The communication error delay is very large; it is basically at the ms level.

[0050] Among them, the zero-crossing detection mode: the acquisition communication device and the electric energy meter both enter the timing transceiver mode. The acquisition communication device collects the zero-crossing signal and pulls up the TX GPIO pin at the same time; after the electric energy meter enters the zero-crossing detection mode, the high-precision timer, the external input pin input capture function and the zero-crossing detection function of the electric energy meter are started. After the electric energy meter detects the RX falling signal, the timer data is recorded; the timer data is recorded when the electric energy meter detects the zero-crossing signal. Since the signals are directly transmitted by physical signals, there is no complex serial port protocol and user protocol, and the data error is very low at the μs level.

[0051] The acquisition communication device can change the RS-485 communication mode in the zero-crossing synchronization mode to synchronize the zero-crossing information to the downstream electric energy meter in real time, and the accuracy of the process can be controlled at the microsecond level.

[0052] Furthermore, after receiving the zero-crossing signal from the acquisition communication device, the electric energy meter starts a high-precision timer to record the zero-crossing moment, and records the moment when the zero-crossing signal on the power line is detected to calculate the zero-crossing cycle difference;

[0053] After receiving the zero-crossing signal from the acquisition communication device, the electric energy meter starts a high-precision timer to record the zero-crossing moment. This precise time recording method improves the accuracy of zero-crossing detection. Phase synchronization: By recording the zero-crossing signal moment on the power line and comparing it with the zero-crossing signal moment of the acquisition communication device, the electric energy meter can calculate the zero-crossing cycle difference, thereby achieving high-precision phase synchronization; by calculating the zero-crossing cycle difference, the electric energy meter can more accurately determine its own phase information. High-precision zero-crossing moment recording and phase synchronization help reduce synchronization errors in the power system, thereby enhancing the stability and reliability of the entire system.

[0054] Accurate zero-crossing moment recording and phase synchronization information can be used to optimize the operation of the power grid, such as providing key data in power dispatching, load balancing and power grid fault analysis.

[0055] The present invention also provides a method for detecting phase information of an electric energy meter based on a dual-mode acquisition communication device, which is characterized by comprising the following steps:

[0056] Step S1: Use a central coordinator (CCO) to configure and network the network to ensure that the devices can communicate with each other and send down the phase information of the collected communication devices; Use a central coordinator (CCO) to configure and network the network to ensure that the devices in the network can communicate with each other efficiently, which helps to optimize network performance and ensure the reliability and accuracy of data transmission;

[0057] Step S2: After the acquisition communication device successfully accesses the network, it actively obtains its grid phase information from the CCO; this ensures that the acquisition communication device has accurate phase information, providing a basis for subsequent phase synchronization and detection;

[0058] Step S3: the acquisition communication device broadcasts its phase information using the RS-485 communication protocol and notifies the electric energy meter to prepare to detect the zero-crossing signal;

[0059] Step S4: The acquisition communication device converts the detected zero-crossing signal into a square wave signal and sends it to the electric energy meter through the RS-485 line; this square wave signal transmission method improves the signal's anti-interference ability and ensures the clarity and accuracy of the signal;

[0060] Step S5: the electric energy meter enters the zero-crossing detection mode, starts the internal timer, and records the zero-crossing time T1 of the acquisition communication device and the zero-crossing signal time T2 of the power line; in step S5, if the electric energy meter obtains more than 30 valid standard zero-crossing information continuously, the detection data is considered valid; otherwise, the detection data;

[0061] Step S6: the electric energy meter calculates the phase of the electric energy meter according to the zero-crossing period difference between T1 and T2 and the phase information of the collected communication device; this step enables the electric energy meter to accurately determine its own phase position, thereby improving the synchronization accuracy of the power system;

[0062] Step S7: The acquisition communication device sequentially obtains the phase information of the electric energy meters through RS-485 instructions; this not only allows the acquisition communication device to summarize the phase information of all electric energy meters, but also allows the information to be verified to ensure the consistency and accuracy of the phase information of the entire system.

[0063] Furthermore, in step S3, the acquisition communication device and the electric energy meter jointly enter the zero-crossing detection mode, and the acquisition communication device simultaneously pulls up the TX GPIO pin when acquiring the zero-crossing signal, while the electric energy meter starts the high-precision timer to record the zero-crossing moment; by synchronizing the acquisition communication device to pull up the TX GPIO pin with the electric energy meter to start the high-precision timer, it is ensured that the zero-crossing moment can be accurately captured, and accurate zero-crossing moment capture helps to improve the stability of the power system; high-precision zero-crossing moment capture reduces dependence on external synchronization signals and reduces system maintenance costs and complexity.

[0064] Further, in step S6, the electric energy meter calculates its own phase information according to the power cycle of 20ms and the phase difference between the three phases of X or 2X, where X is 6.7ms and 2X is 13.4ms. Figure 3 Indicates that the waveforms are completely overlapped, and the acquisition communication equipment and the electric energy meter are in phase. Figure 4 It means that the two waveforms differ by 6.7ms, and the phases of the acquisition and communication equipment and the electric energy meter differ by one phase. If the phase of the acquisition and communication equipment is A, the phase of the electric energy meter is B. Figure 5It means that the two waveforms differ by 13.4ms, and the phases of the acquisition communication device and the electric energy meter differ by two phases. If the phase of the acquisition communication device is A, the phase of the electric energy meter is C. It can be found that the difference between the phases of the standard voltage zero-crossing curve is fixed; the difference between phase A and phase B is 6.7ms, and the difference between phase A and phase C is 13.4ms. The electric energy meter calculates the zero-crossing difference between the acquisition communication device and the electric energy meter through the difference between T1 and T2. If the difference between T1 and T2 is within plus or minus 500μs, it is determined that the acquisition communication device and the electric energy meter are in phase; if the difference between T1 and T2 is within plus or minus 500μs of 6.7ms, it is determined that there is a phase difference; if the difference between T1 and T2 is within plus or minus 500μs of 6.7ms, it is determined that there is a phase difference; If the difference between T1 and T2 is within plus or minus 500μs of 13.4ms, it is judged as a phase difference of two phases; if the difference between T1 and T2 exceeds 500μs, it is judged as a detection failure; by accurately measuring the difference between T1 and T2, the electric energy meter can detect the phase difference with the acquisition communication equipment with high precision; the electric energy meter can accurately determine the phase relationship between itself and the acquisition communication equipment according to the difference between T1 and T2, whether it is the same phase, one phase difference or two phase difference, thereby improving the measurement accuracy and management efficiency of the power system.

[0065] Further, the detection process in step S4 lasts for 3 seconds, and the detection process in step S5 lasts for 2 seconds;

[0066] In step S4 and step S5, the detection can be performed simultaneously on the entire RS-485 network by broadcasting, so as to improve the detection efficiency and reduce the impact on the system.

[0067] It can be seen from the above embodiments that the present invention synchronizes zero-crossing information based on the RS-485 interface between the acquisition communication device and the electric energy meter, and the acquisition communication device obtains its own phase information through CCO; then the acquisition communication device synchronizes the phase information to the downstream electric energy meter. The acquisition communication device and the downstream electric energy meter agree to have two modes: one is the normal mode, that is, the working mode of the existing acquisition communication device and the electric energy meter; the other is the zero-crossing synchronization mode, that is, the acquisition communication device synchronizes the zero-crossing information to the electric energy meter in real time through the RS-485 line; after the acquisition communication device synchronizes the zero-crossing information to the downstream electric energy meter in real time, the downstream electric energy meter detects zero-crossing by itself and calculates its own phase information in combination with the phase of the acquisition communication device.

[0068] The present invention can perform mode expansion on the basis of the existing RS-485 communication interface, and stably synchronize the zero-crossing information of the acquisition communication equipment to the electric energy meter, and the electric energy meter calculates the phase information based on its own zero-crossing information. The technical solution of the present invention is simple and reliable, and occupies less resources; compared with the existing phase recognition scheme, it has great resource advantages and cost advantages. The present invention realizes accurate detection and recognition of the phase information of the electric energy meter by accurately synchronizing the zero-crossing information between the dual-mode acquisition communication equipment and the electric energy meter, which is of great significance to the management and control of the power system.

[0069] The present invention realizes real-time zero-crossing information synchronization between the acquisition communication equipment and the downstream electric energy meter by changing the existing RS-485 communication mode, and the accuracy can be controlled at the microsecond level, which significantly improves the accuracy of phase sequence identification.

[0070] Compared with the big data identification method, the present invention does not need to process and analyze huge data sets, thereby reducing the consumption of computing resources; zero-crossing information synchronization is performed through the RS-485 interface, thereby avoiding the signal interference problem that may be encountered in wireless communication and improving the stability of communication.

[0071] The downstream electric energy meter of the present invention detects zero crossing by itself and quickly calculates its own phase information in combination with the phase where the communication device is collected, thereby improving the detection efficiency.

[0072] The present invention does not need to add additional communication methods, such as Bluetooth, Wi-Fi, etc., which reduces the cost of the system. The present invention can more effectively manage and allocate power resources, reduce energy waste, and improve energy efficiency through accurate phase difference detection and determination.

[0073] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A device for detecting phase information of an electric energy meter based on a dual-mode acquisition communication device, characterized in that: include: Central coordinator, used for network configuration and networking, ensuring that devices can communicate with each other, and sending and collecting phase information of communication devices; The communication equipment acquires the grid phase information from the central coordinator after successful access to the grid, and broadcasts its phase information and zero-crossing information through the RS-485 communication protocol; Multiple electric energy meters are used to receive the phase information and zero-crossing information of the acquisition communication equipment, detect the zero-crossing signal by themselves, and calculate their own phase information in combination with the phase of the acquisition communication equipment.

2. The device for detecting phase information of an electric energy meter based on a dual-mode acquisition communication device according to claim 1 is characterized in that: The acquisition communication device and the electric energy meter communicate with each other via the RS-485 interface, and the acquisition communication device and the electric energy meter support two modes: Normal mode, in which the acquisition communication device and the energy meter send data according to the serial communication protocol; Zero-crossing synchronization mode, in which the acquisition communication equipment and the electric energy meter enter the timing receiving and sending mode to synchronize the zero-crossing information.

3. The device for detecting phase information of an electric energy meter based on a dual-mode acquisition communication device according to claim 2 is characterized in that: The acquisition communication device can change the RS-485 communication mode in the zero-crossing synchronization mode to synchronize the zero-crossing information to the downstream electric energy meter in real time, and the accuracy of the process can be controlled at the microsecond level.

4. The device for detecting phase information of an electric energy meter based on a dual-mode acquisition communication device according to claim 3 is characterized in that: After receiving the zero-crossing signal from the acquisition communication device, the electric energy meter starts a high-precision timer to record the zero-crossing moment, and records the moment when the zero-crossing signal on the power line is detected to calculate the zero-crossing cycle difference.

5. A method for detecting phase information of an electric energy meter based on a dual-mode acquisition communication device, characterized in that: The following steps are involved: Step S1: Use the central coordinator to configure and network the network to ensure that the devices can communicate with each other and send and collect phase information of the communication devices; Step S2: After the communication device successfully accesses the network, it actively obtains its grid phase information from the central coordinator; Step S3: the acquisition communication device broadcasts its phase information using the RS-485 communication protocol and notifies the electric energy meter to prepare to detect the zero-crossing signal; Step S4: The acquisition communication device converts the detected zero-crossing signal into a square wave signal and sends it to the electric energy meter through the RS-485 line; Step S5: the electric energy meter enters the zero-crossing detection mode, starts the internal timer, and records the zero-crossing time T1 of the acquisition communication device and the zero-crossing signal time T2 of the power line; Step S6: the electric energy meter calculates the phase of the electric energy meter according to the zero-crossing period difference between T1 and T2 and the phase information of the collected communication device; Step S7: The acquisition communication device sequentially obtains the phase information of the electric energy meter through RS-485 instructions.

6. The method for detecting phase information of an electric energy meter based on a dual-mode acquisition communication device according to claim 5 is characterized in that: In step S3, the acquisition communication device and the electric energy meter enter the zero-crossing detection mode together. When the acquisition communication device acquires the zero-crossing signal, the TX GPIO pin is pulled high at the same time, and the electric energy meter starts the high-precision timer to record the zero-crossing moment.

7. The method according to claim 5 is a method for detecting phase information of an electric energy meter based on a dual-mode acquisition communication device, characterized in that: In step S5, if the electric energy meter obtains more than 30 valid standard zero-crossing information continuously, the detection data is considered valid; otherwise, the detection data is lost.

8. The method according to claim 5 is a method for detecting phase information of an electric energy meter based on a dual-mode acquisition communication device, characterized in that: In step S6, the electric energy meter calculates its own phase information according to the power cycle of 20 ms and the phase difference between the three phases of X or 2X.

9. The method according to claim 8 is a method for detecting phase information of an electric energy meter based on a dual-mode acquisition communication device, characterized in that: In step S6, if the difference between T1 and T2 is within plus or minus 500μs, it is determined that the acquisition communication equipment and the electric energy meter are in phase; if the difference between T1 and T2 is within plus or minus 500μs of X, it is determined that there is a phase difference; if the difference between T1 and T2 is within plus or minus 500μs of 2X, it is determined that there is a phase difference; if the difference between T1 and T2 exceeds 500μs, it is determined that the detection has failed.

10. The method according to claim 5 is a method for detecting phase information of an electric energy meter based on a dual-mode acquisition communication device, characterized in that: The detection process in step S4 lasts for 3 seconds, and the detection process in step S5 lasts for 2 seconds; In step S4 and step S5, the detection can be performed simultaneously through broadcasting on the entire RS-485 network to improve the detection efficiency and reduce the impact on the system.

Images