Electric energy meter phase information detection method and device based on HDC collector

Abstract

The invention discloses an HDC collector-based electric energy meter phase information detection method and device, and relates to the technical field of electric power communication, and the method comprises the steps: enabling a collector to obtain the phase information of the collector through a central coordinator; the collector synchronizes own phase information and zero-crossing information to a downstream electric energy meter; the electric energy meter collects a zero-crossing signal on a power line of the electric energy meter and zero-crossing information of the collector, and performs statistics to obtain zero-crossing time respectively; the electric energy meter calculates the phase information of the electric energy meter according to the difference value of the two zero-crossing moments and the phase information of the collector, and transmits the phase information to the collector; two RS-485 communication modes, namely a normal mode and a zero-cross detection mode, are adopted between the collector and the downstream electric energy meter. According to the invention, no extra communication mode needs to be added, the cost is low, simultaneous detection can be carried out on all RS-485 networks in a broadcast mode, the identification efficiency is high, direct transmission is carried out by adopting physical signals in the synchronous detection process, no complex serial port protocol or user protocol exists, and the precision is high.

Description

Technical Field

[0001] The present application relates to the field of electric power communication technology, and in particular to a method and device for detecting phase information of an electric energy meter based on an HDC collector. Background Art

[0002] HDC is a dual-mode communication technology based on HPLC (high-speed power line carrier communication), that is, communication on the power line is achieved through power line carrier and micro-power wireless hybrid networking. At present, the collector communication module can only identify the phase sequence information of the line connected to the collector, and the phase sequence identification of the downstream electric energy meter is still under exploration. In addition, the common phase sequence identification methods currently include big data identification methods and identification methods that increase communication methods (Bluetooth, WiFi, etc.), but these methods consume a lot of resources, have poor test accuracy, and unstable detection. Summary of the invention

[0003] In order to solve the problem that the HDC collector communication module cannot realize the phase sequence identification of the downstream electric energy meter, the present application proposes a method and device for detecting the phase information of the electric energy meter based on the HDC collector. Based on the existing collector and the RS-485 interface of the electric energy meter, the present application changes the RS-485 communication mode. The collector synchronizes the zero-crossing information to the downstream electric energy meter in real time. The downstream electric energy meter detects the zero-crossing by itself and calculates its own phase information based on the phase of the collector.

[0004] This application is implemented through the following technical solutions: A method for detecting phase information of an electric energy meter based on an HDC collector, the method comprising: The collector obtains its own phase information through the central coordinator; The collector synchronizes its own phase information and zero-crossing information to the downstream energy meter; The electric energy meter collects the zero-crossing signal on its own power line and the zero-crossing information of the collector, and obtains the zero-crossing time by counting them respectively; The electric energy meter calculates the phase information of the electric energy meter according to the difference between the two zero-crossing moments and the phase information of the collector and transmits the phase information to the collector; Among them, two RS-485 communication modes are adopted between the collector and the downstream electric energy meter: normal mode, that is, the existing communication mode between the collector and the downstream electric energy meter; and zero-crossing detection mode, that is, the collector synchronizes the zero-crossing information to the electric energy meter through the RS-485 communication protocol.

[0005] In some implementations, the collector obtains the phase information of the collector itself through the central coordinator, specifically including: The central coordinator is used to realize networking and network maintenance, ensure that devices can communicate with each other, and send phase information of collectors; After the collector successfully joins the network, the phase information of the collector is obtained from the central coordinator.

[0006] In some implementations, the collector synchronizes its own phase information and zero-crossing information to the downstream electric energy meter, specifically including: The collector broadcasts its phase information in normal mode, notifies the electric energy meter to prepare to detect zero-crossing signals, and agrees with the electric energy meter to jointly enter the zero-crossing detection mode; The collector enters the zero-crossing detection mode as agreed, collects the zero-crossing signal on its own power line and converts it into a square wave signal, and sends the square wave signal to the downstream electric energy meter; after the zero-crossing detection process is completed, it returns to the normal mode; In the zero-crossing detection mode, the collector and the downstream electric energy meter use a timing receiving and sending mode for signal transmission.

[0007] In some implementations, the electric energy meter collects the zero-crossing signal on its own power line and the zero-crossing information of the collector, and respectively obtains the zero-crossing time by counting, specifically including: The electric energy meter enters the zero-crossing detection mode as agreed, starts the high-precision timer inside the electric energy meter, and records the zero-crossing moment of the collector; The electric energy meter collects the zero-crossing signal on its own power line and records the zero-crossing moment of the electric energy meter through a high-precision timer inside the electric energy meter; The collector zero-crossing time and the energy meter zero-crossing time are continuously recorded, and the collector zero-crossing time and the energy meter zero-crossing time are counted respectively.

[0008] In some implementations, the electric energy meter collects the zero-crossing signal on its own power line and the zero-crossing information of the collector, and respectively obtains the zero-crossing time by counting, and further includes: Determine whether valid standard zero-crossing information above a preset value is obtained continuously, if so, the test data is considered valid, otherwise the test data is invalid; After the zero-crossing detection process is completed, it returns to normal mode.

[0009] In some implementations, the electric energy meter calculates the phase information of the electric energy meter according to the difference between the two zero-crossing moments and the phase information of the collector and transmits it to the collector, specifically including: If the difference between the zero-crossing time of the collector and the zero-crossing time of the electric energy meter is within the allowable error range, it is determined that the collector and the electric energy meter are in phase; If the difference between the zero-crossing time of the collector and the zero-crossing time of the electric energy meter is within the permissible error range of 6.7 ms, it is determined that the collector and the electric energy meter are out of phase by one phase; If the difference between the zero-crossing cycle time of the collector and the zero-crossing time of the electric energy meter is within the allowable error range of 13.4 ms, it is determined that the collector and the electric energy meter differ by two phases; According to the determination result, combined with the phase information of the collector, the phase information of the electric energy meter can be determined.

[0010] In some implementations, the electric energy meter calculates the phase information of the electric energy meter according to the difference between the two zero-crossing moments and the phase information of the collector and transmits the phase information to the collector, further comprising: If the electric energy meter is a three-phase electric energy meter, it should also be determined whether there is a zero-crossing moment among the three zero-crossing moments of the electric energy meter whose difference with the zero-crossing moment of the collector is within the allowable error range. If not, the detection fails.

[0011] On the other hand, the present application proposes an electric energy meter phase information detection device based on an HDC collector, the electric energy meter phase information detection device is used in the above-mentioned electric energy meter phase information detection method; the electric energy meter phase information detection device comprises: a collector and several downstream electric energy meters; The collector and the electric energy meters communicate with each other using two RS-485 communication modes, which are a normal mode and a zero-crossing detection mode.

[0012] In some embodiments, the collector comprises: A high-precision timer A, which is used to record the precise time of the collector's zero-crossing moment; A statistical calculation unit A, the statistical calculation unit A is used to count the zero-crossing time of the collector; RS-485 communication unit A, the RS-485 communication unit A is used to realize data communication between the collector and the electric energy meter in normal mode; A HDC communication unit, the HDC communication unit is used to realize data communication between the collector and the central coordinator to obtain phase information of the collector; A zero-crossing signal acquisition unit A, wherein the zero-crossing signal acquisition unit A is used to acquire the zero-crossing signal on the power line of the collector itself and convert it into a square wave signal in a zero-crossing detection mode; And, a square wave signal sending unit, wherein the square wave signal sending unit is used to send the square wave signal in a zero-crossing detection mode.

[0013] In some embodiments, the electric energy meter comprises: A high-precision timer B, which is used to record the precise time when the electric energy meter crosses zero and the precise time when the collector crosses zero; A statistical calculation unit B, the statistical calculation unit B is used to count the zero-crossing time of the electric energy meter and the zero-crossing time of the collector, and calculate the difference between the two zero-crossing times, and calculate the phase information of the electric energy meter in combination with the phase information of the collector; A zero-crossing signal acquisition unit B, wherein the zero-crossing signal acquisition unit is used to collect a zero-crossing signal on its own power line in a zero-crossing detection mode; A square wave signal acquisition unit, the square wave signal acquisition unit is used to collect the square wave signal emitted by the collector in a zero-crossing detection mode; And, RS-485 communication unit B, the RS-485 communication unit B is used for data communication between the electric energy meter and the collector in normal mode.

[0014] The present application proposes a method and device for detecting the phase information of an electric energy meter based on an HDC collector. Based on the existing RS-485 interface between the collector and the electric energy meter, the collector obtains its own phase information through CCO and synchronizes it to the downstream electric energy meter. The collector and the downstream electric energy meter agree on two working modes: normal mode, which is the working mode of the existing collector and the electric energy meter; and a zero-crossing detection module, which is that after the collector synchronizes its own zero-crossing information to the downstream electric energy meter through the RS-485 transmission line, the downstream electric energy meter calculates its own phase information through self-detection filtering, combining the collector's zero-crossing information and the phase of the collector. This detection method does not require the addition of additional communication methods, has low cost, can be detected simultaneously on the entire RS-485 network through broadcasting, has high recognition efficiency, uses physical signals for direct transmission during synchronization detection, does not have complex serial port protocols and user protocols, and can achieve μs-level accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the embodiments of the present application, constitute a part of the present application, and do not constitute a limitation on the embodiments of the present application. In the drawings: Figure 1 This is a flow chart of the detection method of an embodiment of the present application; Figure 2 Two standard voltage zero-crossing curve examples 1 of the embodiment of the present application; Figure 3 Two standard voltage zero-crossing curve examples 2 of the embodiment of the present application; Figure 4 Two standard voltage zero-crossing curve examples 3 of the embodiment of the present application; Figure 5 This is a schematic diagram of the overall structure of the detection device according to an embodiment of the present application; Figure 6 This is a schematic diagram of the collector principle of an embodiment of the present application; Figure 7 This is a schematic diagram of the principle of an electric energy meter according to an embodiment of the present application. DETAILED DESCRIPTION

[0016] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with examples and drawings. The illustrative implementation scheme of the present application and its description are only used to explain the present application and are not intended to limit the present application.

[0017] Embodiment: At present, the HDC collector can only identify the phase sequence information of the line connected to the collector, and cannot realize the phase sequence identification of the downstream electric energy meter; in addition, the phase sequence identification methods commonly used at present mainly include big data identification methods and identification methods that increase communication methods. However, these identification methods consume large resources, have poor test accuracy, and unstable detection. In view of this, this embodiment proposes a phase information detection method for an electric energy meter based on an HDC collector. The detection method proposed in this embodiment changes the RS-485 communication mode on the basis of the existing HDC collector and the electric energy meter RS-485 interface. The collector synchronizes the zero-crossing information to the downstream electric energy meter in real time, and the accuracy can be controlled at the μs level. The downstream electric energy meter detects the zero-crossing information by itself and calculates its own phase information in combination with the phase where the collector is located. The detection method proposed in this embodiment does not require the addition of additional communication methods, and the implementation method is simple. It can be detected synchronously through the entire RS-485 network through broadcasting, with high recognition efficiency and accuracy up to the μs level.

[0018] like Figure 1 As shown, the detection method proposed in this embodiment specifically includes the following steps: Step 100: The collector obtains its own phase information through the central coordinator.

[0019] Among them, the central coordinator CCO is used to realize networking and network maintenance, ensure that devices can communicate with each other, and send phase information of collectors. The networking and network maintenance process is as follows: After the central coordinator CCO is powered on, it first starts the neighbor network monitoring timer and monitors the inter-network coordination frames for a period of time to find out whether there is a neighbor network; If the central coordinator CCO receives the inter-network coordination frame from the neighboring network during the monitoring period, it will coordinate with the neighboring network; after the coordination is successful, it will start sending central beacons to start networking.

[0020] If the central coordinator CCO does not receive any inter-network coordination frame during the monitoring period, it starts to send central beacons after the monitoring ends.

[0021] The central coordinator CCO needs to arrange beacon TDMA slots and CSMA slots in the central beacon. The beacon TDMA slot is used to instruct the CCO, PCO, or STA to send a beacon. The CSMA slot is used to allow the primary stations around the CCO to send association request messages to the CCO to request access to the network; or in the CSMA slot, the CCO sends association confirmation, association summary indication and other messages.

[0022] If a primary site requests to access the network, CCO needs to authenticate the site requesting to access the network through a whitelist. Afterwards, CCO can inform STA of the result of the association request by sending an association confirmation message or an association summary indication message. When the primary site accesses the network, CCO can arrange beacon slots to allow the newly-connected primary site to send discovery beacons. The sending of discovery beacons can trigger secondary sites around the newly-connected site to initiate requests for association access. When the secondary site accesses the network, CCO can arrange beacon slots to allow the newly-connected secondary site to send discovery beacons, triggering the third-level sites around the secondary site to initiate requests for association access. This cycle repeats so that the highest-level STA site farthest from CCO can join the network. CCO is level 0, and the maximum level of STA should support level 1.

[0023] During the networking process, in each beacon cycle, CCO must arrange beacon time slots for each proxy site, so that all proxy sites send proxy beacons. The proxy beacon will notify the proxy sites and STA sites at all levels of the time slot arrangement and other contents in the central beacon layer by layer. In the networking, CCO can notify the network access results of the first-level site through an association confirmation message or an association summary indication message. For the network access of non-first-level STA sites, after processing the association request of the STA, CCO will carry the processing result in the generated association confirmation message and send it to the proxy site of the STA, and the proxy site will notify the STA site that requested network access.

[0024] Among them, the association confirmation message and the association summary indication message can only be sent in the CSMA time slot.

[0025] After the HDC collector successfully joins the network, it actively obtains the phase information of the collector from the central coordinator.

[0026] Step 200: The collector synchronizes its own phase information and zero-crossing information to the downstream electric energy meter. There are two RS-485 communication modes between the collector and the downstream electric energy meter: (1) normal mode, i.e., the working mode of the existing collector and the downstream electric energy meter; (2) zero-crossing detection mode, i.e., the collector synchronizes the zero-crossing information to the electric energy meter in real time through the RS-485 communication protocol.

[0027] The collector uses the RS-485 communication protocol (in normal mode) to broadcast its phase information and notify the electric energy meter to prepare to detect the zero-crossing signal, which is the zero point when the voltage on the power line changes from negative to positive. At the same time, it agrees with the electric energy meter to enter the zero-crossing detection mode together.

[0028] The collector enters the zero-crossing detection mode as agreed, collects the zero-crossing signal on its own power line and converts the detected zero-crossing signal into a square wave signal, where the positive half axis of the square wave signal is 1 and the negative half axis is 0, and sends it to the downstream electric energy meter through the RS-485 communication unit. The whole detection process lasts for 3 seconds, and then returns to the normal RS-485 communication mode.

[0029] The normal RS-485 communication mode is essentially a serial communication mode. Data (start bit, data bit, check bit, stop bit) is sent according to the serial port protocol. In addition, the user-defined protocol causes a large communication error delay, which is basically at the ms level. In the zero-crossing detection mode, both the collector and the energy meter enter the sequential transceiver mode. The collector collects the zero-crossing signal and pulls up the TX GPIO pin at the same time. It should be noted that on the collector side, in normal mode, the TX GPIO is the serial port's transmit pin; in zero-crossing detection mode, the TX GPIO is configured as a general IO.

[0030] After the energy meter enters the zero-crossing detection mode, the high-precision timer and external input pin input capture functions are started, and the zero-crossing detection function of the energy meter is started. After the energy meter detects the RXGPIO falling signal, the timer data is recorded; when the energy meter detects the zero-crossing signal, the timer data is recorded. Since the signals are directly transmitted by physical signals, there is no complicated serial port protocol and user protocol, and the data error is very low, all at the μs level. It should be noted that on the energy meter side, in normal mode, RXGPIO is configured as the receiving pin of the serial port; in zero-crossing detection mode, RX GPIO is configured as an external input.

[0031] Step 300: The electric energy meter collects the zero-crossing signal on its own power line and the zero-crossing information of the collector, and obtains the zero-crossing time by counting respectively.

[0032] The electric energy meter enters the zero-crossing detection mode as agreed, starts the high-precision timer inside the electric energy meter, and records the zero-crossing time of the collector through the electric energy meter interrupt signal. The electric energy meter collects the zero-crossing signal on its own power line and records the zero-crossing time of the electric energy meter through the high-precision timer, continuously records the zero-crossing time of the collector and the zero-crossing time of the electric energy meter, and counts the zero-crossing time of the collector and the zero-crossing time of the electric energy meter respectively. If more than 30 valid zero-crossing information are obtained continuously (zero-crossing time intervals of 20ms are all judged as valid zero-crossing information), the detection data is considered valid; otherwise, the detection data is invalid. The entire detection process lasts for 2 seconds, and then returns to the normal RS-485 communication mode.

[0033] Since the RS-485 buses are all interconnected, detection can be performed synchronously through broadcasting, which can greatly improve detection efficiency and reduce the impact of the detection process on the system.

[0034] Step 400: The electric energy meter calculates the phase information of the electric energy meter according to the zero-crossing time and the phase information of the collector and transmits the phase information to the collector.

[0035] The phase information and zero-crossing period of the collector are known. The zero-crossing period of the power line is fixed at 20ms (50Hz), and the phase difference between phases A, B, and C is fixed at 120 degrees. Figure 2-Figure 4 It can be found that the difference between the phases of the standard voltage zero-crossing curve is fixed; Figure 2 It can be seen that the waveforms completely overlap, indicating that the collector and the electric energy meter are in phase; Figure 3 It can be seen that the two waveforms differ by 6.7ms, indicating that the phases of the collector and the energy meter differ by one phase. If the phase of the collector is A, the phase of the energy meter is B. Figure 4 It can be seen that the two waveforms differ by 13.4ms, which means that the phases of the collector and the electric energy meter differ by two phases. If the phase of the collector is A, the phase of the electric energy meter is C.

[0036] Based on the above mechanism, the electric energy meter calculates the phase information of the electric energy meter based on the difference between its own zero-crossing moment and the zero-crossing moment of the collector and the phase information of the collector. Specifically, if the difference between the two zero-crossing moments is within plus or minus 500μs (i.e., the allowable error range), it is determined that the collector and the electric energy meter are in phase; if the difference between the two zero-crossing moments is within plus or minus 500μs of 6.7ms, it is determined that the collector and the electric energy meter differ by one phase; if the difference between the two zero-crossing moments is within plus or minus 500μs of 13.4ms, it is determined that the collector and the electric energy meter differ by two phases. Based on this, the phase information of the electric energy meter can be determined according to the phase information of the collector.

[0037] Furthermore, if the electric energy meter is a three-phase electric energy meter, it is also necessary to determine whether there is a zero-crossing moment among the three zero-crossing moments of the electric energy meter (i.e., the zero-crossing cycle on the three-phase power line) whose difference with the zero-crossing moment of the collector is within plus or minus 500μs. If not, it is determined that the detection has failed.

[0038] After the detection is completed, the collector obtains the phase information of the electric energy meter from the electric energy meter through instructions, thereby completing the phase identification of the downstream electric energy meter.

[0039] The detection method proposed in this embodiment is based on the existing collector and electric energy meter RS-485 interface. The collector obtains its own phase information through CCO and synchronizes it to the downstream electric energy meter. The collector and the downstream electric energy meter agree on two working modes: normal mode, that is, the working mode of the existing collector and electric energy meter; and zero-crossing detection module, that is, after the collector synchronizes its own zero-crossing information to the downstream electric energy meter through the RS-485 transmission line, the downstream electric energy meter calculates its own phase information through self-detection filtering, combining the collector's zero-crossing information and the phase of the collector. This detection method does not require the addition of additional communication methods, has low cost, can be detected simultaneously in the entire RS-485 network through broadcasting, has high recognition efficiency, uses physical signals for direct transmission during synchronization detection, does not have complex serial port protocols and user protocols, and can achieve μs level accuracy.

[0040] Based on the same technical concept as above, this embodiment also proposes an electric energy meter phase information detection device based on HDC collector, such as Figure 5 As shown, the detection device proposed in this embodiment includes a collector and several electric energy meters downstream; The collector communicates with several electric energy meters through RS-485 communication units. There are two RS-485 communication modes between the collector and downstream electric energy meters: Normal mode, i.e., the working mode of the existing collector and downstream energy meter, i.e., serial communication mode; And, zero-crossing detection mode, that is, the collector synchronizes its own zero-crossing information to the energy meter in real time through the RS-485 communication protocol. In this working mode, the signal transmission between the collector and the energy meter adopts the timing receiving and sending mode. In addition, the collector and the central coordinator communicate through HPLC (high-speed power line carrier communication) / HRF (high-speed wireless communication).

[0041] Furthermore, if Figure 6 As shown, the collector also includes: High-precision timer A, which is used to record the precise time of the collector's zero-crossing moment; A statistical calculation unit A, which is used to count the zero-crossing time of the collector; RS-485 communication unit A, which is used to realize data communication between the collector and the electric energy meter in normal mode; HDC communication unit, which is used to realize data communication between the collector and CCO to obtain the phase information of the collector itself; A zero-crossing signal acquisition unit A, which is used to collect the zero-crossing signal on the power line of the collector itself and convert it into a square wave signal in a zero-crossing detection mode; And, a square wave signal sending unit, which is used to send a square wave signal (zero-crossing information of the collector) in a zero-crossing detection mode.

[0042] Furthermore, if Figure 7 As shown, the electric energy meter also includes: High-precision timer B, which is used to record the precise time when the electric energy meter crosses zero and the precise time when the collector crosses zero; The statistical calculation unit B is used to count the zero-crossing time of the collector and the zero-crossing time of the electric energy meter that have been successfully collected, and calculate the difference between the two zero-crossing times, and calculate the phase information of the electric energy meter in combination with the phase information of the collector.

[0043] A zero-crossing signal acquisition unit B, which is used to collect the zero-crossing signal on its own power line in a zero-crossing detection mode; A square wave signal acquisition unit, which is used to acquire the square wave signal (i.e., the zero-crossing information of the collector) emitted by the collector in the zero-crossing detection mode; And, RS-485 communication unit B, the RS-485 communication unit B is used for data communication between the electric energy meter and the collector in normal mode.

[0044] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0045] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0046] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0047] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0048] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above description is only the specific implementation method of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A method for detecting phase information of an electric energy meter based on a HDC collector, characterized in that: The electric energy meter phase information detection method comprises: The collector obtains its own phase information through the central coordinator; The collector synchronizes its own phase information and zero-crossing information to the downstream energy meter; The electric energy meter collects the zero-crossing signal on its own power line and the zero-crossing information of the collector, and obtains the zero-crossing time by counting them respectively; The electric energy meter calculates the phase information of the electric energy meter according to the difference between the two zero-crossing moments and the phase information of the collector and transmits the phase information to the collector; Among them, two RS-485 communication modes are adopted between the collector and the downstream electric energy meter: normal mode, that is, the existing communication mode between the collector and the downstream electric energy meter; and zero-crossing detection mode, that is, the collector synchronizes the zero-crossing information to the electric energy meter through the RS-485 communication protocol.

2. The method for detecting phase information of an electric energy meter based on a HDC collector according to claim 1, characterized in that: The collector obtains the phase information of the collector itself through the central coordinator, specifically including: The central coordinator is used to realize networking and network maintenance, ensure that devices can communicate with each other, and send phase information of collectors; After the collector successfully joins the network, the phase information of the collector is obtained from the central coordinator.

3. The method for detecting phase information of an electric energy meter based on a HDC collector according to claim 1, characterized in that: The collector synchronizes its own phase information and zero-crossing information to the downstream electric energy meter, specifically including: The collector broadcasts its phase information in the normal mode, notifies the electric energy meter to prepare to detect the zero-crossing signal, and agrees with the electric energy meter to jointly enter the zero-crossing detection mode; The collector enters the zero-crossing detection mode as agreed, collects the zero-crossing signal on its own power line and converts it into a square wave signal, and sends the square wave signal to the downstream electric energy meter; after the zero-crossing detection process is completed, it returns to the normal mode; In the zero-crossing detection mode, the collector and the downstream electric energy meter use a timing receiving and sending mode for signal transmission.

4. The method for detecting phase information of an electric energy meter based on a HDC collector according to any one of claims 1 to 3, characterized in that: The electric energy meter collects the zero-crossing signal on its own power line and the zero-crossing information of the collector, and respectively obtains the zero-crossing time by counting, which specifically includes: The electric energy meter enters the zero-crossing detection mode as agreed, starts the high-precision timer inside the electric energy meter, and records the zero-crossing moment of the collector; The electric energy meter collects the zero-crossing signal on its own power line and records the zero-crossing moment of the electric energy meter through a high-precision timer inside the electric energy meter; The collector zero-crossing time and the energy meter zero-crossing time are continuously recorded, and the collector zero-crossing time and the energy meter zero-crossing time are counted respectively.

5. The method for detecting phase information of an electric energy meter based on a HDC collector according to claim 4 is characterized in that: The electric energy meter collects the zero-crossing signal on its own power line and the zero-crossing information of the collector, and respectively obtains the zero-crossing time by counting, and further includes: Determine whether valid standard zero-crossing information above a preset value is obtained continuously, if so, the test data is considered valid, otherwise the test data is invalid; After the zero-crossing detection process is completed, it returns to normal mode.

6. The method for detecting phase information of an electric energy meter based on a HDC collector according to claim 5, characterized in that: The electric energy meter calculates the phase information of the electric energy meter according to the difference between the two zero-crossing moments and the phase information of the collector and transmits it to the collector, which specifically includes: If the difference between the zero-crossing time of the collector and the zero-crossing time of the electric energy meter is within the allowable error range, it is determined that the collector and the electric energy meter are in phase; If the difference between the zero-crossing time of the collector and the zero-crossing time of the electric energy meter is within the allowable error range of 6.7 ms, it is determined that the collector and the electric energy meter are out of phase by one phase; If the difference between the zero-crossing time of the collector and the zero-crossing time of the electric energy meter is within the allowable error range of 13.4 ms, it is determined that the collector and the electric energy meter differ by two phases; According to the determination result, combined with the phase information of the collector, the phase information of the electric energy meter can be determined.

7. The method for detecting phase information of an electric energy meter based on a HDC collector according to claim 6, characterized in that: The electric energy meter calculates the phase information of the electric energy meter according to the difference between the two zero-crossing moments and the phase information of the collector and transmits it to the collector, and also includes: If the electric energy meter is a three-phase electric energy meter, it should also be determined whether there is a zero-crossing moment among the three zero-crossing moments of the electric energy meter whose difference with the zero-crossing moment of the collector is within the allowable error range. If not, the detection fails.

8. An electric energy meter phase information detection device based on HDC collector, characterized in that: The electric energy meter phase information detection device is used to implement the electric energy meter phase information detection method according to any one of claims 1 to 7; the electric energy meter phase information detection device comprises: a collector and several downstream electric energy meters; The collector and the electric energy meters communicate with each other using two RS-485 communication modes, which are a normal mode and a zero-crossing detection mode.

9. The electric energy meter phase information detection device based on HDC collector according to claim 8 is characterized in that: The collector comprises: A high-precision timer A, which is used to record the precise time of the collector's zero-crossing moment; A statistical calculation unit A, the statistical calculation unit A is used to count the zero-crossing time of the collector; RS-485 communication unit A, the RS-485 communication unit A is used to realize data communication between the collector and the electric energy meter in normal mode; An HDC communication unit, the HDC communication unit is used to realize data communication between the collector and the central coordinator to obtain phase information of the collector; A zero-crossing signal acquisition unit A, wherein the zero-crossing signal acquisition unit A is used to acquire the zero-crossing signal on the power line of the collector itself and convert it into a square wave signal in a zero-crossing detection mode; And, a square wave signal sending unit, wherein the square wave signal sending unit is used to send the square wave signal in a zero-crossing detection mode.

10. The electric energy meter phase information detection device based on HDC collector according to claim 9, characterized in that: The electric energy meter comprises: A high-precision timer B, which is used to record the precise time when the electric energy meter crosses zero and the precise time when the collector crosses zero; A statistical calculation unit B, the statistical calculation unit B is used to count the zero-crossing time of the electric energy meter and the zero-crossing time of the collector, and calculate the difference between the two zero-crossing times, and calculate the phase information of the electric energy meter in combination with the phase information of the collector; A zero-crossing signal acquisition unit B, wherein the zero-crossing signal acquisition unit is used to collect a zero-crossing signal on its own power line in a zero-crossing detection mode; A square wave signal acquisition unit, the square wave signal acquisition unit is used to collect the square wave signal emitted by the collector in a zero-crossing detection mode; And, RS-485 communication unit B, the RS-485 communication unit B is used for data communication between the electric energy meter and the collector in normal mode.

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