Multi-channel low-voltage shunt monitoring device and topology identification method based on HPLC communication

Abstract

The present invention discloses a multi-channel low-voltage shunt monitoring device and topology identification method based on HPLC communication. The device includes an MCU, a current acquisition circuit, a voltage acquisition circuit, a voltage comparison circuit, an RS485 interface, and an HPLC module. The MCU of the device receives switching instructions through the HPLC module and controls the load capacitor to switch according to the switching instructions. When the load capacitor is switched, a load switching characteristic signal is generated and transmitted to the power line, so that the characteristic signal detection circuit of the upper level can detect the characteristic signal from the power line, thereby obtaining the upper and lower level relationship of the entire topology. The present invention can realize the digital transformation of existing low-voltage distribution lines, realize dynamic identification of low-voltage line topology, and improve the monitoring level of low-voltage lines.

Description

Technical Field

[0001] The present invention relates to a multi-channel low-voltage shunt monitoring device based on HPLC communication and a topology identification method, belonging to the technical field of low-voltage station area monitoring. Background Art

[0002] Currently, most low-voltage substations lack the ability to collect real-time data on the operating status of power lines. In some low-voltage substations, only local or remote meters are installed on the main outgoing lines and first-level branches in the distribution room. Ordinary molded case circuit breakers without communication capabilities are used for overcurrent protection at branches above the second level. This makes it impossible to collect the operating status of the low-voltage lines in real time across the entire topology. Furthermore, due to the large number of end-users of low-voltage distribution lines in substations, the topological relationships of low-voltage lines are also changing with social development, resulting in deviations between the topological relationships of low-voltage substations and the records in the ledger. Manual verification of the topological relationships is labor-intensive and impractical.

[0003] With the development of low-voltage power distribution Internet of Things, there is an urgent need to collect the operating status and topological status of low-voltage lines in real time to support efficient operation and maintenance. Summary of the Invention

[0004] The present invention firstly aims at the problem that the operating status and topological relationship of the current low-voltage line cannot be collected in real time, and provides a multi-channel low-voltage branch monitoring device and a topology identification method based on HPLC communication.

[0005] In a first aspect, the present invention provides a multi-channel low-voltage shunt monitoring device based on HPLC communication, comprising: an MCU, a current acquisition circuit, a voltage acquisition circuit, a voltage comparison circuit, and an HPLC module;

[0006] The current acquisition circuit, voltage acquisition circuit, voltage comparison circuit and HPLC module are all connected to the MCU; the current acquisition circuit is used to convert the current signal collected by the current transformer into a voltage signal that can be collected by the MCU, and input the voltage signal into the MCU;

[0007] The voltage acquisition circuit is used to convert the 220V voltage into a voltage signal that can be acquired by the MCU after isolation and transformation, and input the voltage signal into the MCU; the voltage comparison circuit is used to convert the voltage signal of the selected line into a level signal through an AC optocoupler and input the level signal into the MCU, so that the MCU can determine whether the selected line is energized; the HPLC module is used to achieve communication based on the power line;

[0008] The device also includes a load switching circuit and a load capacitor, wherein the load capacitor is connected to the load switching circuit, and the load switching circuit is connected to the MCU, the load switching circuit is used to receive a signal output by the MCU to control the switching of the load capacitor, and the load capacitor is used to generate a load switching characteristic signal and transmit it to the power line;

[0009] The characteristic signal detection circuit is used to detect the load switching characteristic signal on the power line and input the characteristic signal into the MCU.

[0010] Furthermore, the RS485 interface is used to achieve communication via wired mode.

[0011] Furthermore, the device also includes a supercapacitor and a supercapacitor control circuit. The supercapacitor is used to provide a backup power supply for the device, and the supercapacitor control circuit is used to control the charging and discharging of the supercapacitor.

[0012] Furthermore, the device further includes a Bluetooth debugging serial port, and the Bluetooth debugging serial port is used to implement a debugging function.

[0013] Furthermore, the device further includes at least one of FLASH and EEPROM.

[0014] In a second aspect, the present invention further provides a topology identification method for a multi-channel low-voltage shunt monitoring device based on HPLC communication, wherein the device adopts a multi-channel low-voltage shunt monitoring device based on HPLC communication as provided in any embodiment of the above technical solution, and the device is connected to each topological branch of the low-voltage station area; the topology identification method includes:

[0015] The topology identification method includes:

[0016] The MCU of the device receives the switching instruction through the HPLC module and controls the load capacitor to switch according to the switching instruction;

[0017] When the load capacitor is switched, a load switching characteristic signal is generated and transmitted to the power line, so that the upper characteristic signal detection circuit detects the characteristic signal from the power line, thereby obtaining the upper and lower level relationship of the entire topology.

[0018] Furthermore, the method specifically includes:

[0019] Acquire information of all the devices in the low-voltage area, store the information of each device in a queue, wherein the information of each device includes a device address; sequentially retrieve information of each device from the queue, communicate with the corresponding device according to the device address, and send switching instructions to the MCU of each device through the HPLC module, so that the MCU of each device controls the switching of the load capacitor according to the switching instructions;

[0020] When the load capacitor is switched, a load switching characteristic signal is generated and transmitted to the power line;

[0021] Read and store the status of all devices detecting characteristic signals from the power line; repeat this step until all devices are traversed, and obtain the topology of the low-voltage section of the entire power supply network based on all the monitoring status obtained.

[0022] The invention has the following beneficial effects: It can digitally transform existing low-voltage distribution lines, dynamically identify low-voltage line topology, enhance low-voltage line monitoring, improve lean management of distribution substations, and enhance power supply reliability. Even in the event of a power outage, normal operation can still be maintained, and the power outage status can be identified and reported. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and examples.

[0024] Attachment Figure 1 is a structural diagram of a specific embodiment of the present invention;

[0025] Attachment Figure 2 This is an application scenario of a specific embodiment of the present invention;

[0026] Attachment Figure 3 The dynamic topology recognition principle involved in the specific embodiment of the present invention;

[0027] Attachment Figure 4 This is a dynamic topology recognition algorithm involved in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0029] In the description of the patent of the present invention, it should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the listed elements but also other elements that are not explicitly listed.

[0030] Example: Figure 1 As shown in FIG, a multi-channel low-voltage shunt monitoring device based on HPLC communication includes an MCU, a current acquisition circuit, a voltage acquisition circuit, a voltage comparison circuit, an RS485 interface, and an HPLC module.

[0031] The MCU uses the Cortex-M3 core and has multi-channel analog-to-digital conversion function.

[0032] The current acquisition circuit is responsible for converting the current signal collected by the external CT into a low voltage signal that can be collected by the MCU. In a specific embodiment, the use of open CTs allows for non-stop installation, which does not affect the user's power supply during equipment installation and maintenance.

[0033] The voltage acquisition circuit converts the 220V voltage of the first line into a small voltage signal that can be collected by the MCU after isolation and transformation.

[0034] The voltage comparison circuit converts the voltage signals of the other three lines into level signals via an AC optocoupler, allowing the MCU to detect whether the lines are energized. The device provided in this embodiment enables real-time monitoring of the status of multiple low-voltage power supply lines. By collecting data from multiple analog channels through multi-channel analog-to-digital conversion, the present invention can monitor the operating status of up to four lines in real time.

[0035] Optionally, the device includes FLASH and EEPROM, wherein the FLASH is used to store event and curve data, and the EEPROM is used to store parameters.

[0036] Optionally, a watchdog and a clock are also included. The watchdog is used to monitor the working status of the MCU and reset it after the MCU is in a dead loop. The real-time clock is used to provide a system clock that can be maintained during power-off.

[0037] Optionally, a supercapacitor control circuit is included to control the charging and discharging of the supercapacitor, which provides backup power for the system. After a power outage, the device can continue to operate for a short period of time and report the outage. By using a large-capacity supercapacitor as a backup power source, normal operation can be maintained for up to three minutes after a power outage, ensuring reliable transmission of power outage information.

[0038] like Figure 1 As shown, this embodiment includes a load switching circuit for controlling the smooth and undisturbed switching of the load capacitor, which is used to generate a load switching signal. A characteristic signal detection circuit is used to detect the characteristic signal generated by the switching of the load capacitor. The present invention generates a characteristic signal through load switching. Based on the characteristic signal's characteristic that is only transmitted upstream of the topology, dynamic topology recognition is achieved by detecting the characteristic signal.

[0039] Optionally, it includes a Bluetooth debugging serial port and an RS485 interface. The Bluetooth debugging serial port is used to implement convenient on-site debugging. The RS485 interface is used for wired uplink communication.

[0040] In this embodiment, the HPLC module is used for uplink communication based on the power line. Using the power line as the communication medium eliminates the need for laying a separate communication cable.

[0041] The application scenarios of the device involved in the present invention are as follows Figure 2As shown, it includes the device involved in the present invention, a substation intelligent fusion terminal, a 10kV transformer, a low-voltage distribution cabinet, a low-voltage branch box, and an electric meter box. The device involved in the present invention can be installed in a low-voltage distribution cabinet, a low-voltage branch box, or a meter box to monitor the power supply line status at the location in real time, and uses HPLC communication mode to communicate with the substation intelligent fusion terminal using power lines as the medium.

[0042] The intelligent fusion terminal of the substation area can control the device involved in the present invention to realize dynamic topology identification through a certain topology identification strategy.

[0043] The dynamic topology recognition method used by the device involved in the present invention is as follows Figure 3 As shown, the figure shows a typical low-voltage substation power supply topology, in which the transformer supplies power to the load through multiple branches. The hollow dots and solid dots in the figure represent the devices involved in the present invention. When device 4-1 generates a characteristic signal through the switching of the capacitor, the signal will be transmitted along the topology structure in the power supply direction (i.e., the upstream of the topology), that is, devices 4-0, 2-1, 2-0, 1-1, and 1-0 (i.e., the solid dots in the figure) can all detect the characteristic signal, while other devices (i.e., the hollow dots in the figure) cannot detect the characteristic signal. Therefore, it can be judged that the solid dots are located in the topology upstream of 4-1. By controlling each device to emit a characteristic signal in turn and collecting the detection status of the characteristic signal by all devices, the superior-subordinate relationship of the entire topology can be obtained, thereby realizing dynamic topology identification. The specific method is as follows. Figure 4 As shown, first the device information is obtained and put into the queue, then the information of each device is taken out from the queue in turn, and the corresponding device is communicated with according to the device address to control it to send a capacitor switching characteristic signal, and then the detection status of all devices for the characteristic signal is read and stored, and then the next device is taken out and the above process is repeated until all devices are processed. At this time, the upstream and downstream relationships of each device can be analyzed based on the information obtained, and the topology of the entire power supply network can be obtained accordingly.

[0044] The multi-channel low-voltage branch monitoring device and topology identification method based on HPLC communication provided by the present invention are intelligent detection equipment that can perform real-time collection of electrical quantities and dynamic topology identification. They can monitor the electrical parameters of distribution cabinets, distribution boxes, and terminal meters at the radiation position of the substation, realize automatic identification of substation topology, and realize low-voltage line power outage, undervoltage, overvoltage, overcurrent, electricity theft, leakage, load fluctuation and other operating status monitoring, realize low-voltage line operating status monitoring, electrical quantity monitoring and other functions, improve the monitoring level of low-voltage lines, and improve the lean management level and power supply reliability of distribution substations.

[0045] This device uses supercapacitors as backup power supplies. After power failure, the device can continue to work for more than 3 minutes through the backup power supply to ensure reliable information reporting. It can be installed and disassembled without power outages, and communicates with superior devices through HPLC. It uses power lines as a communication medium and does not require separate communication cables.

[0046] Those skilled in the art should understand that the embodiments of the present application may be provided as methods that can be implemented in the form of a computer program product on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0047] The present application is described with reference to the flowcharts of the methods according to the embodiments of the present application. It should be understood that each process in the flowchart and the method 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 produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the process described in the flowchart. Figure 1 One process or multiple processes.

[0048] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work 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 One process or multiple processes.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-channel low-pressure shunt monitoring device based on HPLC communication, characterized in that: include: MCU, current acquisition circuit, voltage acquisition circuit, voltage comparison circuit, HPLC module, load switching circuit and load capacitor; The current acquisition circuit, voltage acquisition circuit, voltage comparison circuit and HPLC module are all connected to the MCU; the current acquisition circuit is used to convert the current signal collected by the current transformer into a voltage signal that can be collected by the MCU, and input the voltage signal into the MCU; The voltage acquisition circuit is used to convert the 220V voltage into a voltage signal that can be collected by the MCU after isolation and transformation, and input the voltage signal into the MCU; the voltage comparison circuit is used to convert the voltage signal of the selected line into a level signal through an AC optocoupler and input the level signal into the MCU, so that the MCU can determine whether the selected line is energized; The HPLC module is used to realize communication based on the power line; The load capacitor is connected to a load switching circuit, which is connected to an MCU. The load switching circuit is used to receive a signal output by the MCU to control the switching of the load capacitor. The load capacitor is used to generate a load switching characteristic signal and transmit it to the power line. The characteristic signal detection circuit is used to detect the load switching characteristic signal on the power line and input the characteristic signal to the MCU; When the load capacitor of a device generates a load switching characteristic signal, the signal is transmitted along the topology structure toward the power supply direction. The device upstream of the load capacitor detects the characteristic signal, while other devices cannot detect the characteristic signal. By sequentially controlling each device to emit a load switching characteristic signal and collecting the detection status of all devices for the load switching characteristic signal, the hierarchical relationship of the entire topology is obtained, thus achieving dynamic topology recognition. The multi-channel low-voltage branch monitoring device based on HPLC communication is installed in a low-voltage distribution cabinet, a low-voltage branch box or an electric meter box to monitor the power supply line status at the location in real time, and uses HPLC communication to communicate with the intelligent fusion terminal of the substation area using the power line as the medium; First, the device information is obtained and put into a queue. The information of each device is taken out from the queue in turn. The corresponding device is communicated with according to the device address. The MCU of each device controls the load capacitor to switch according to the switching instruction to generate a load switching characteristic signal. The detection status of the characteristic signal of all devices is read and stored, and then the next device is taken out and the above process is repeated until all devices are processed. At this time, the upstream and downstream relationships of each device can be analyzed based on the information obtained, and the topology of the entire power supply network can be obtained accordingly.

2. The multi-channel low-pressure shunt monitoring device based on HPLC communication according to claim 1, characterized in that: It also includes an RS485 interface, which is connected to the MCU and is used to provide a wired communication method.

3. The multi-channel low-pressure shunt monitoring device based on HPLC communication according to claim 1, characterized in that: The device further comprises a supercapacitor and a supercapacitor control circuit. The supercapacitor is used to provide a backup power source for the device, and the supercapacitor control circuit is used to control the charging and discharging of the supercapacitor.

4. The multi-channel low-pressure shunt monitoring device based on HPLC communication according to claim 1, characterized in that: The device further comprises a Bluetooth debugging serial port, and the Bluetooth debugging serial port is used to implement a debugging function.

5. The multi-channel low-pressure shunt monitoring device based on HPLC communication according to claim 1, characterized in that: The device further includes at least one of FLASH and EEPROM.

6. The topology identification method of the multi-channel low-voltage shunt monitoring device based on HPLC communication according to any one of claims 1 to 5, characterized in that: Connect the devices to each topological branch of the low-voltage station area respectively; The topology identification method includes: The MCU of the device receives the switching instruction through the HPLC module and controls the load capacitor to switch according to the switching instruction; When the load capacitor is switched on and off, a load switching characteristic signal is generated and transmitted to the power line, so that the characteristic signal detection circuit of the upper level can detect the characteristic signal from the power line, thereby obtaining the upper and lower level relationship of the entire topology; The method specifically includes: Acquire information of all the devices in the low-voltage area, store the information of each device in a queue, wherein the information of each device includes a device address; sequentially retrieve information of each device from the queue, communicate with the corresponding device according to the device address, and send switching instructions to the MCU of each device through the HPLC module, so that the MCU of each device controls the switching of the load capacitor according to the switching instructions; When the load capacitor is switched, a load switching characteristic signal is generated and transmitted to the power line; Read and store the status of all devices detecting characteristic signals from the power line; repeat this step until all devices are traversed, and obtain the topology of the low-voltage section of the entire power supply network based on all the monitoring status obtained.

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