Protection monitoring system for backup battery

Abstract

The utility model discloses a protection monitoring system for a backup battery, which relates to the technical field of power system automation and comprises a switching power supply, a core device, the backup battery, a backup battery protection monitoring module and a cooling fan. The switching power supply is provided with a switching power supply charging and discharging interface, the backup battery protection monitoring module comprises an MCU controller, a backup battery information collector, a main power supply power-down monitor and a relay, and the MCU controller is connected with the backup battery information collector, the main power supply power-down monitor, the relay, the cooling fan and the core device. The relay is further connected with the switching power supply charging and discharging interface and the backup battery. The main power supply power failure monitor is further connected with the switching power supply. The core devices are DTU and FTU core devices. The method can effectively reduce the field fault of the backup battery, prolong the service life of the battery, and greatly reduce the field manual operation and inspection workload, thereby supporting the long-term and stable operation of the power distribution network in a severe environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system automation, in particular to a protection monitoring system for backup battery. BACKGROUND

[0002] In the distribution network automation system, stable backup battery is an important condition for supporting the long-term and stable operation of the intelligent power grid. However, due to the particularity of the operating environment of outdoor distribution network equipment (such as harsh environment, small space, etc.), there is currently a lack of effective means for real-time protection monitoring of backup batteries of outdoor distribution network equipment such as ring network cabinets, branch boxes, pole-mounted switches, etc.

[0003] The main reasons for the field failure of backup batteries include unreasonable setting of float voltage and charging current, harsh field operating environment, and improper operation and maintenance of the battery. First, unreasonable setting of float voltage and charging current is an important reason for the failure of backup batteries. The field battery charging current is set too large, especially in high temperature conditions, which causes the battery to be in an over-float state for a long time, the internal temperature rises, and swelling deformation or negative acidification occurs. Second, the harsh field operating environment is also one of the reasons for the failure of backup batteries. For example, in outdoor cabinets, the temperature can reach 50-60℃, and the temperature can be below 0℃. Such harsh environment exacerbates the damage to the battery. In the related art, the state of the backup battery is checked by regular inspection by operation and maintenance personnel, which has the problems of long inspection period, large workload, poor timeliness, and inability to accurately monitor the internal hidden dangers of the backup battery. CONTENT OF THE UTILITY MODEL

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a protection monitoring system for backup battery, which can effectively reduce the field failure of backup battery, prolong the service life of the battery, greatly reduce the workload of field manual operation and maintenance, and thus support the long-term and stable operation of the distribution network in harsh environments.

[0005] The present application provides a protection monitoring system for backup battery, comprising: a switching power supply, a core device, a backup battery, a backup battery protection monitoring module and a cooling fan.

[0006] The switching power supply is provided with a switching power supply charging and discharging interface, the backup battery protection monitoring module comprises an MCU controller, a backup battery information collector, a main power supply failure monitor and a relay, the MCU controller is connected with the backup battery information collector, the main power supply failure monitor, the relay, the cooling fan and the core device respectively, the backup battery information collector is further connected with the backup battery, the relay is further connected with the switching power supply charging and discharging interface and the backup battery respectively, and the main power supply failure monitor is further connected with the switching power supply.

[0007] The core device is a DTU or FTU core device, and the switching power supply is connected with the core device.

[0008] According to some embodiments of the present application, the backup battery protection monitoring module further comprises a hardware watchdog monitor connected with the MCU controller.

[0009] According to some embodiments of the present application, the core device is provided with a first 485 communication interface, the backup battery protection monitoring module further comprises a second 485 communication interface, and the core device is connected with the MCU controller through the first 485 communication interface and the second 485 communication interface in sequence.

[0010] According to some embodiments of the present application, the backup battery protection monitoring module further comprises a first I / O interface and a second I / O interface, the MCU controller is connected with the cooling fan through the first I / O interface, and the MCU controller is connected with the relay through the second I / O interface.

[0011] According to some embodiments of the present application, the backup battery protection monitoring module further comprises a first voltage reduction circuit and a second voltage reduction circuit, an input end of the first voltage reduction circuit is connected with the switching power supply, an output end of the first voltage reduction circuit is connected to the relay, an input end of the second voltage reduction circuit is connected with the switching power supply, and output ends of the second voltage reduction circuit are respectively connected with the MCU controller, the backup battery information collector and the main power supply power failure monitor.

[0012] According to some embodiments of the present application, the first voltage reduction circuit is a DC / DC voltage reduction circuit for converting 24V or 48V into 5V, and the second voltage reduction circuit is a DC / DC voltage reduction circuit for converting 24V or 48V into 3.3V.

[0013] According to some embodiments of the present application, the backup battery information collector and the main power supply power failure monitor both use ADC data collectors.

[0014] In the application, the switching power supply is used to convert 220V power supply into 48V to power the FTU core device in the DTU and FTU core device, and the switching power supply is also used to convert 220V power supply into 24V to power the FTU and the DTU core device in the FTU core device, the backup battery information collector is used to collect the voltage, internal resistance, charging and discharging current and temperature information of the backup battery and send the collected backup battery information collection data to the core device through the MCU controller, and the core device determines whether to charge the backup battery according to the received backup battery information collection data, if necessary, the core device needs to send a backup battery charging instruction to the switching power supply, so that the switching power supply charges the backup battery through the switching power supply charging and discharging interface and the relay according to the backup battery charging instruction; the core device is also used to send a backup battery activation instruction to the switching power supply at regular intervals, and the switching power supply activates the backup battery regularly according to the received backup battery activation instruction; the relay is connected in series in the charging and discharging circuit between the switching power supply and the backup battery, when it is determined according to the backup battery information collection data that the detected temperature of the backup battery exceeds the preset temperature threshold, the normally closed contact of the relay is opened by the MCU controller, and then the floating charging voltage is disconnected, at the same time, the MCU controller controls the cooling fan to work to perform the heat dissipation operation on the backup battery, and the MCU controller is used to manage all hardware resources, realize the functions of collection, communication, control and debugging; the main power supply power failure monitor is used to monitor the voltage of the main power supply in real time, and when the detected power supply voltage is lower than the preset minimum voltage, the MCU controller controls the backup battery to supply power to the core device. Through this setting, the application can effectively reduce the on-site failure of the backup battery, prolong the service life of the battery, greatly reduce the on-site manual inspection workload, and support the long-term and stable operation of the power distribution network in harsh environments.

[0015] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0016] Additional aspects and advantages of the application will become apparent and appreciated through a consideration of the following description, taken in conjunction with the accompanying drawings in which:

[0017] Figure 1 The schematic diagram of the connection relationship of various elements of the backup battery protection monitoring module provided for the embodiments of the application and external elements;

[0018] Figure 2 The connection relationship schematic diagram of the protection monitoring system for the backup battery provided for the embodiments of the application. DETAILED DESCRIPTION

[0019] Embodiments of the present application are described below in detail with reference to examples shown in the drawings, wherein the same or similar numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are for the purpose of explaining the present application only, and are not to be understood as limiting the present application.

[0020] In the description of the present application, it needs to be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the purpose of describing the present application and simplifying the description, and is not to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application.

[0021] In the description of the present application, if the first, second, etc. are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of technical features indicated.

[0022] In the description of the present application, unless otherwise explicitly limited, the words such as arrangement, installation, connection, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0023] In the power distribution network automation system, stable backup batteries are an important condition for supporting long-term and stable operation of power grid intelligence. However, due to the particularity of the operating environment of outdoor power distribution network equipment (such as harsh environment, small space, etc.), there is currently a lack of effective means for real-time protection monitoring of backup batteries of outdoor power distribution network equipment such as ring network cabinets, branch boxes, pole-mounted switches, etc.

[0024] The main reasons for the field failure of backup batteries include unreasonable setting of float voltage and charging current, harsh field operating environment, and improper operation and maintenance of the battery. First, unreasonable setting of float voltage and charging current is an important reason for backup battery failure. The field battery charging current is set too large, especially in high temperature conditions, which causes the battery to be in an over-float state for a long time, the internal temperature rises, and swelling deformation or negative acidification occurs. Second, the harsh field operating environment is also one of the reasons for the failure of backup batteries. For example, in outdoor cabinets, the temperature can reach 50-60℃, and the temperature can be below 0℃. Such harsh environment exacerbates the damage to the battery. In the related art, the state of the backup battery is checked by regular inspection by operation and inspection personnel, which has problems such as long inspection period, large workload, poor timeliness, and inability to accurately monitor internal hidden dangers of the backup battery.

[0025] In order to solve the above problems, the application provides a protection monitoring system for a backup battery, and the embodiments of the application are further described below with reference to the drawings.

[0026] With reference to Figure 1 and Figure 2 The application provides a protection monitoring system for a backup battery, which comprises a switching power supply, a core device, a backup battery, a backup battery protection monitoring module and a cooling fan. The switching power supply is provided with a switching power supply charging and discharging interface. The backup battery protection monitoring module comprises an MCU controller, a backup battery information collector, a main power supply power failure monitor and a relay. The MCU controller is connected with the backup battery information collector, the main power supply power failure monitor, the relay, the cooling fan and the core device respectively. The backup battery information collector is further connected with the backup battery. The relay is further connected with the switching power supply charging and discharging interface and the backup battery respectively. The main power supply power failure monitor is further connected with the switching power supply. The core device is a DTU and FTU core device. The switching power supply is connected with the core device.

[0027] It should be noted that the full name of MCU is Microcontroller Unit, which is translated as micro control unit, also known as single chip microcomputer (Single Chip Microcomputer) or single chip microcomputer. In some embodiments, the MCU controller selects a MCU chip GD32F303RE with Cotex-M4 core of Megui Innovation, which is responsible for managing all hardware resources, realizing functions such as collection, communication, control and debugging; in other embodiments, the MCU controller can also select other suitable MCU chips, and is not limited to the embodiments of the application.

[0028] It should be noted that the main power supply power failure monitor is arranged to ensure that the backup battery is connected to the power supply circuit of the core device when the switching power supply is powered off.

[0029] It should be noted that the DTU full name is Data Transfer Unit, translated as data transfer unit, mainly used for data transmission of power distribution system, can convert serial port data into IP data or convert IP data into serial port data, transmit through wireless communication network (such as GPRS, 3G, 4G, NB-IoT, etc.), it supports automatic heartbeat, keeps permanent online, provides serial port data bidirectional conversion function, and integrates TCP / IP protocol stack internally; FTU full name is Feeder Terminal Unit, full name is feeder terminal unit, mainly used for monitoring and data acquisition of power distribution line, installed on overhead line and cable line of power distribution network, it can monitor voltage, current, temperature and other parameters of line in real time, at the same time control switch of line, FTU adopts advanced DSP digital signal processing technology, multi-CPU integration technology, high-speed industrial network communication technology, has the characteristics of strong stability, high reliability, good real-time performance, etc., it is suitable for urban, rural, enterprise power distribution network automation engineering, completes monitoring, control and protection of ring network cabinet, pole-mounted switch and communication and other automation functions.

[0030] In the present application, the switching power supply is used to convert 220V power supply into 48V to power the FTU core device in the DTU, FTU core device, and the switching power supply is also used to convert 220V power supply into 24V to power the FTU, FTU core device in the DTU core device, the backup battery information collector is used to collect the voltage, internal resistance, charging and discharging current and temperature information of the backup battery and send the collected backup battery information collection data to the core device through the MCU controller, and the core device determines whether to charge the backup battery according to the received backup battery information collection data, if necessary, the core device needs to send the backup battery charging instruction to the switching power supply, so that the switching power supply charges the backup battery through the switching power supply charging and discharging interface and the relay according to the backup battery charging instruction; the core device is also used to send the backup battery activation instruction to the switching power supply at regular intervals, and the switching power supply activates the backup battery regularly according to the received backup battery activation instruction; the relay is connected in series in the charging and discharging circuit between the switching power supply and the backup battery, when it is determined according to the backup battery information collection data that the detected temperature of the backup battery exceeds the preset temperature threshold, the MCU controller controls the normally closed contact of the relay to be disconnected, thereby disconnecting the floating charging voltage, and the MCU controller controls the cooling fan to work to perform the cooling operation on the backup battery, and the MCU controller is used to manage all hardware resources, realize the functions of collection, communication, control and debugging; the main power supply dropout monitor is used to monitor the voltage of the main power supply in real time, and when the detected power supply voltage is lower than the preset minimum voltage, the MCU controller controls the backup battery to supply power to the core device. Through this setting, the on-site failure of the backup battery can be effectively reduced, the service life of the battery is prolonged, and the on-site manual operation workload is greatly reduced, thereby supporting the long-term and stable operation of the power distribution network in harsh environments.

[0031] It should be noted that the relay is connected in series in the charging and discharging circuit between the switching power supply and the backup battery, when it is determined according to the backup battery information collection data that the detected temperature of the backup battery exceeds the preset temperature threshold, the MCU controller controls the normally closed contact of the relay to be disconnected, thereby disconnecting the floating charging voltage, and the MCU controller controls the cooling fan to work to perform the cooling operation on the backup battery, realizing the high-temperature floating charging protection function: high-temperature floating automatic cut-off, high-temperature threshold can be set, and the fan can be put into operation for cooling; battery state analysis: the backup battery is activated regularly, which is a method for improving the performance of the backup battery and prolonging the service life of the backup battery. It can activate the chemical composition inside the backup battery, promote the reaction of the backup battery, and make the backup battery regain a better charging state.

[0032] Reference Figure 1 It can be understood that the backup battery protection monitoring module further comprises a hardware watchdog monitor connected with the MCU controller.

[0033] In the embodiment, the hardware watchdog adopts Sengbon Micro SGM706-S, and the hardware watchdog is a hardware device or circuit for monitoring the running state of a system, which mainly functions to detect whether an MCU controller is normally running, and automatically restarts or takes other recovery measures when the MCU controller fails or is unresponsive.

[0034] With reference to Figure 1 It can be understood that the core device is provided with a first 485 communication interface, the backup battery protection monitoring module further comprises a second 485 communication interface, and the core device is connected with the MCU controller in sequence through the first 485 communication interface and the second 485 communication interface.

[0035] It should be noted that the backup battery voltage, current, internal resistance, temperature and other parameters are monitored by the backup battery information collector, the battery state and service life are analyzed, the RS485 communication interface is communicated with the core device, and the background monitoring system can be uploaded.

[0036] It can be understood that the backup battery protection monitoring module further comprises a first I / O interface and a second I / O interface, the MCU controller is connected with the cooling fan through the first I / O interface, and the MCU controller is connected with the relay through the second I / O interface.

[0037] It should be noted that I / O is the abbreviation of Input / Output, which means input / output in Chinese. In the field of computer science, I / O is usually used to describe the process of interaction between the computer and the outside world.

[0038] It should be noted that the MCU extends two-way relay circuits through IO, one of which is used to switch the charging and discharging circuit through its normally closed contact, and the other is used to control the cooling fan to cool the backup battery.

[0039] It can be understood that the backup battery protection monitoring module further comprises a first voltage reduction circuit and a second voltage reduction circuit, the input end of the first voltage reduction circuit is connected with the switching power supply, the output end of the first voltage reduction circuit is connected to the relay, the input end of the second voltage reduction circuit is connected with the switching power supply, and the output end of the second voltage reduction circuit is connected with the MCU controller, the backup battery information collector and the main power supply power failure monitor.

[0040] It can be understood that the first voltage reduction circuit is a DC / DC voltage reduction circuit for converting 24V or 48V to 5V, and the second voltage reduction circuit is a DC / DC voltage reduction circuit for converting 24V or 48V to 3.3V.

[0041] Specifically, the first voltage reduction circuit converts the 24V power supply of the FTU core device or the 24V power supply of the DTU core device in the core device supplied by the switching power supply into 5V to power the relay; the second voltage reduction circuit converts the 48V power supply of the DTU core device in the core device or the 48V power supply of the DTU core device in the core device supplied by the switching power supply into 3.3V to power the MCU controller, the backup battery information collector and the main power supply outage monitor, respectively.

[0042] It can be understood that the backup battery information collector and the main power supply outage monitor both use the ADC data collector.

[0043] It should be noted that the ADC (Analog-to-Digital Converter) is an electronic device that can convert continuous analog electrical signals into digital signals.

[0044] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0045] The above is the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, can make several improvements and refinements, these improvements and refinements are also considered to be within the scope of the present application.

[0046] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A protection monitoring system for backup batteries, characterized in that, include: Switching power supply, core device, backup battery, backup battery protection and monitoring module, and cooling fan; The switching power supply is provided with a switching power supply charging and discharging interface. The backup battery protection and monitoring module includes an MCU controller, a backup battery information collector, a main power failure monitor, and a relay. The MCU controller is connected to the backup battery information collector, the main power failure monitor, the relay, the cooling fan, and the core device. The backup battery information collector is also connected to the backup battery. The relay is also connected to the switching power supply charging and discharging interface and the backup battery. The main power failure monitor is also connected to the switching power supply. The core device is a DTU or FTU core device, and the switching power supply is connected to the core device.

2. The protection and monitoring system for backup batteries according to claim 1, characterized in that, The backup battery protection monitoring module also includes a hardware watchdog monitor, which is connected to the MCU controller.

3. The protection monitoring system for backup batteries according to claim 1, characterized in that, The core device is provided with a first 485 communication interface, and the backup battery protection monitoring module further includes a second 485 communication interface. The core device is connected to the MCU controller in sequence through the first 485 communication interface and the second 485 communication interface.

4. The protection and monitoring system for backup batteries according to claim 1, characterized in that, The backup battery protection monitoring module also includes a first I / O interface and a second I / O interface. The MCU controller is connected to the cooling fan through the first I / O interface and to the relay through the second I / O interface.

5. The protection monitoring system for backup batteries according to claim 1, characterized in that, The backup battery protection monitoring module further includes a first step-down circuit and a second step-down circuit. The input terminal of the first step-down circuit is connected to the switching power supply, and the output terminal of the first step-down circuit is connected to the relay. The input terminal of the second step-down circuit is connected to the switching power supply, and the output terminal of the second step-down circuit is connected to the MCU controller, the backup battery information collector, and the main power failure monitor, respectively.

6. The protection monitoring system for backup batteries according to claim 5, characterized in that, The first step-down circuit is a 24V or 48V to 5V DC / DC step-down circuit, and the second step-down circuit is a 24V or 48V to 3.3V DC / DC step-down circuit.

7. The protection monitoring system for backup batteries according to claim 1, characterized in that, Both the backup battery information collector and the main power failure monitor use ADC data acquisition devices.

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