A medium frequency grid-connected power supply monitoring system

Abstract

The present application provides a medium frequency grid-connected power supply monitoring system, including an industrial computer at a central control room operation station, multiple on-site stations and multiple power supply monitoring modules. The power supply monitoring module uses a controller local area network to directly connect to multiple monitoring nodes of the medium frequency power supply, and is used to collect data from multiple monitoring nodes and perform first-level caching. The on-site station uses an RS485 network to communicate with at least one power supply monitoring module, and is used to collect data from at least one power supply monitoring module and perform second-level caching. The industrial computer at the central control room operation station uses Ethernet to communicate with multiple on-site stations respectively, and is used to aggregate all data transmitted by multiple on-site stations and process and store all data. The present application improves the stability and data processing capability of the medium frequency grid-connected power supply monitoring system by combining a controller local area network, an RS485 network and Ethernet.

Description

Technical Field

[0001] The present application belongs to the technical field of medium frequency power supply, and specifically relates to a medium frequency grid-connected power supply monitoring system. Background Art

[0002] With the actual operation of domestic centrifugal projects, power supply monitoring of domestic dedicated medium frequency power supplies is also particularly important. With the continuous improvement of the medium frequency power supply system, its intelligence level has been greatly improved, which has put forward higher requirements on communication efficiency and reliability.

[0003] At present, medium frequency power supplies use a new type of Controller Area Network (CAN) bus communication technology in system communication, which greatly improves communication efficiency and reliability. However, although the existing CAN bus communication technology has improved communication efficiency to a certain extent, it still faces problems such as insufficient communication rate, communication conflicts when collecting large amounts of data, and insufficient data real-time performance in the medium frequency grid-connected power supply environment. Summary of the invention

[0004] In view of this, the embodiments of the present application are committed to providing a medium frequency grid-connected power supply monitoring system, which adopts a layered network structure to solve the problems existing in the prior art in the medium frequency grid-connected power supply environment, such as insufficient communication rate, communication conflicts when collecting large amounts of data, and insufficient data real-time performance.

[0005] The present application provides a medium frequency grid-connected power supply monitoring system, which includes an industrial computer at a central control room operation station, multiple local stations and multiple power supply monitoring modules. The power supply monitoring module uses a controller local area network to directly connect to multiple monitoring nodes of the medium frequency power supply, and is used to collect data from multiple monitoring nodes and perform first-level caching. The local station uses an RS485 network to communicate with at least one power supply monitoring module, and is used to collect data from at least one power supply monitoring module and perform second-level caching. The industrial computer at the central control room operation station uses Ethernet to communicate with multiple local stations respectively, and is used to aggregate all data transmitted by multiple local stations and process and store all data.

[0006] In a specific embodiment of the present application, the power supply monitoring module includes a power supply module, an analog quantity acquisition module, a switch quantity module, an external storage module, a controller area network communication module, a main controller and an RS485 communication module, and the power supply module, the analog quantity acquisition module, the switch quantity module, the external storage module, the controller area network communication module and the RS485 communication module are all connected to the main controller. The power supply module is used to provide power for the analog quantity acquisition module, the switch quantity module, the external storage module, the controller area network communication module, the main controller and the RS485 communication module; the analog quantity acquisition module is used to collect analog quantity signals of industrial sites; the switch quantity module is used to collect relay signals of industrial sites; the external storage module is used to store data obtained by fault recording; the controller area network communication module is used to transmit data of the controller area network node device on site to the main controller; the RS485 communication module is used to transmit data on the main controller to the local station; the main controller is used to obtain and process all monitoring data from the power supply module, the analog quantity acquisition module, the switch quantity module, the external storage module and the controller area network communication module and transmit them to the industrial computer of the central control room operation station through the RS485 communication module.

[0007] In a specific embodiment of the present application, the data obtained by the fault recording includes the capacitor switching status, the overexcitation operation time, the overexcitation status, the real-time input active power after the overexcitation, the input active power before the overexcitation, the energy-saving effect, the input current before the overexcitation, the input current after the overexcitation, the output voltage before the overexcitation, the output voltage after the overexcitation, the operating voltage setting value after the overexcitation, the effect degradation reminder after the overexcitation, the normal operation overexcitation reminder and the accumulated power saving.

[0008] In a specific embodiment of the present application, a local station system software is installed on the main controller. The local station system software is used to obtain all monitoring data from the power module, analog quantity acquisition module, switch quantity module, external storage module and controller LAN communication module and compare part or all of all monitoring data with corresponding standard data, and send an alarm signal to the local station when the monitoring data is abnormal.

[0009] In a specific implementation of the present application, all monitoring data include the operating time and real-time time of the medium frequency power supply.

[0010] In a specific embodiment of the present application, the local station system software includes a temperature flow measurement program, a controller area network communication program, an RS485 communication program and a data storage program. The temperature flow measurement program is used to obtain and analyze the temperature signal and flow signal collected by the analog acquisition module; the controller area network communication program is used to receive and process the data of the field controller area network node device obtained through the controller area network communication module; the RS485 communication program is used to transmit the data on the main controller to the local station through the RS485 communication module; the data storage program is used to record various data signals and store them in the external storage module in a compressed and / or encrypted manner.

[0011] In a specific implementation of the present application, the RS485 communication program uses an optimized handshake protocol and an organization and transmission mechanism.

[0012] In a specific implementation of the present application, the external storage module stores data for no less than 6 months.

[0013] In a specific embodiment of the present application, a host computer system software is installed on the industrial computer of the central control room operation station. The host computer system software is used to aggregate or call data transmitted by multiple local stations and form alarm signals and protection signals based on the data transmitted by multiple local stations, and write historical data into a database for storage.

[0014] In a specific embodiment of the present application, a monitoring interface is provided on the industrial computer of the central control room operation station, and the monitoring interface includes a primary system diagram, a network diagram, a fault record, an alarm record, an operation record, an alarm page and a medium frequency power supply over-excited operation status screen.

[0015] The beneficial effect of the technical solution of the present application is that the medium frequency grid-connected power supply monitoring system is mainly composed of three levels: an industrial computer at a central control room operation station, multiple local stations, and multiple power supply monitoring modules corresponding to the multiple local stations. Each level adopts different network technologies and protocols, thereby realizing data collection and monitoring in a layered network structure. By combining CAN, RS485 network and Ethernet, the damage of a single monitoring node will not affect the data transmission of other monitoring nodes, thereby improving the stability and data processing capability of the medium frequency grid-connected power supply monitoring system, and realizing efficient data collection, processing and transmission. Especially in the grid-connected medium frequency power supply mode, the medium frequency grid-connected power supply monitoring system can accurately monitor and display the grid-connected status of the medium frequency power supply. The conversion solution of the controller LAN to the RS485 network solves the problem of inconsistent underlying communication protocols of various field equipment, and greatly improves the inspection cycle and frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1Shown is a structural schematic diagram of a medium frequency grid-connected power supply monitoring system provided in one embodiment of the present application.

[0017] Figure 2 Shown is a structural schematic diagram of a medium frequency grid-connected power supply monitoring system provided in another embodiment of the present application.

[0018] Figure 3 Shown is a structural schematic diagram of a power supply monitoring module provided in one embodiment of the present application. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] At least one embodiment of the present application provides a medium frequency grid-connected power supply monitoring system, referring to Figure 1 The medium frequency grid-connected power supply monitoring system includes an industrial computer 1 at the central control room operation station, multiple local stations 2 and multiple power supply monitoring modules 3. The power supply monitoring module 3 uses a controller area network (CAN) to directly connect to multiple monitoring nodes of the medium frequency power supply, and is used to collect data from multiple monitoring nodes and perform primary caching. The local station 2 uses an RS485 network to communicate with at least one power supply monitoring module 3, and is used to collect data from at least one power supply monitoring module 3 and perform secondary caching. The industrial computer 1 at the central control room operation station uses Ethernet to communicate with multiple local stations 2 respectively, and is used to aggregate all data transmitted by multiple local stations 2 and process and store all data.

[0021] It should be noted that the Ethernet uses the TCP / IP protocol for network communication. The RS485 network uses the MODBUS / RTU protocol for network communication. The power supply monitoring module 3 can use LPC11C14.

[0022] The industrial computer 1 of the central control room operation station is the remote control layer of the medium frequency grid-connected power supply monitoring system, that is, the highest layer. The power supply monitoring module 3 is the bottom layer of the medium frequency grid-connected power supply monitoring system and is also the foundation of the medium frequency grid-connected power supply monitoring system. The local station 2 is the middle layer of the medium frequency grid-connected power supply monitoring system, located between the bottom layer and the remote control layer. Figure 2 , an Ethernet communication connection can be achieved between the industrial computer 1 at the central control room operation station and multiple local stations 2 using a switch.

[0023] For example, refer to Figure 1, the number of multiple local stations 2 can be 2, each power supply monitoring module 3 corresponds to 4 monitoring nodes, the controller area network used by the 4 monitoring nodes corresponding to one of the 2 power supply monitoring modules 3 are CAN1, CAN2, CAN3 and CAN4 respectively, and the controller area network used by the 4 monitoring nodes corresponding to the other of the 2 power supply monitoring modules 3 are CAN5, CAN6, CAN7 and CAN8 respectively. The medium frequency power supply collects data through a CAN network composed of four monitoring nodes. These four monitoring nodes include the medium frequency power supply rectifier monitoring node (class A), the inverter monitoring node (class B), and the two section power supply cabinet monitoring nodes (class C). The multiple monitoring nodes of the medium frequency power supply can transmit the status and electrical parameters of the rectification, inversion, section power supply and other subsystems of the medium frequency power supply through the controller area network, that is, the real-time voltage, current, control and status parameters of each subsystem of the medium frequency power supply can be directly transmitted and obtained through the controller area network, which greatly improves the response and data quality of the medium frequency grid-connected power supply monitoring system.

[0024] For example, refer to Figure 2 , the number of multiple on-site stations 2 can be 8, namely JD1 to JD8. Each on-site station can correspond to one or more power supply monitoring modules 3. The number of multiple monitoring nodes corresponding to the power supply monitoring module 3 can be different, and can be set according to actual conditions. For example, the number of multiple monitoring nodes connected to the power supply monitoring modules 3 corresponding to JD1, JD3 and JD5 is 12, the number of multiple monitoring nodes connected to the power supply monitoring modules 3 corresponding to JD2 and JD7 is 11, the number of multiple monitoring nodes connected to the power supply monitoring modules 3 corresponding to JD6 is 10, and the number of multiple monitoring nodes connected to the power supply monitoring modules 3 corresponding to JD4 and JD8 is 6. The power supply monitoring module 3 can be equipped with an ARM chip, which uses the powerful processing capability of the ARM chip to convert the data signals of multiple monitoring nodes of the grid-connected medium-frequency power supply to the RS485 network through CAN, and after interface conversion using the MODBUS / RTU protocol, upload them to the local station (JD1-JD8) in the middle layer through the RS485 network; the local station 2 analyzes, processes, records and stores the collected signals, and uploads the processed data to the industrial computer 1 of the central control room operation station in the remote control layer through optical fiber (TCP / IP protocol) as needed, thereby completing the transmission of the data of the medium-frequency grid-connected power supply monitoring system.

[0025] According to the technical solution provided in the embodiment of the present application, by setting the power supply monitoring module 3 to be directly connected to multiple monitoring nodes using a controller local area network, the power supply monitoring module 3 can efficiently collect data from multiple monitoring nodes. The controller local area network is widely used in industrial monitoring systems due to its high reliability and real-time performance, and provides a solid data transmission foundation for the bottom layer of the medium frequency grid-connected power supply monitoring system. By setting the local station 2 to communicate with at least one power supply monitoring module 3 using an RS485 network, the local station 2 can effectively collect and process data from at least one power supply monitoring module 3 because the RS485 network has the advantages of long-distance transmission and multi-device connection. By setting the central control room operation station industrial computer 1 to communicate with multiple local stations 2 respectively using Ethernet, the high speed and reliability of data transmission are ensured. The embodiment of the present application sets up the medium frequency grid-connected power supply monitoring system, which is mainly composed of three levels: an industrial computer 1 at a central control room operation station, multiple local stations 2, and multiple power supply monitoring modules 3 corresponding to the multiple local stations 2. Each level adopts different network technologies and protocols, thereby realizing data collection and monitoring in a layered network structure. A combination of CAN, RS485 network and Ethernet is adopted, so that damage to a single monitoring node will not affect the data transmission of other monitoring nodes, thereby improving the stability and data processing capability of the medium frequency grid-connected power supply monitoring system, and realizing efficient data collection, processing and transmission. Especially in the grid-connected medium frequency power supply mode, the medium frequency grid-connected power supply monitoring system can accurately monitor and display the grid-connected status of the medium frequency power supply. The conversion solution of the controller LAN to the RS485 network solves the problem of inconsistent underlying communication protocols of various field devices such as field controller LAN node devices, and greatly improves the inspection cycle and frequency. In addition, the medium frequency grid-connected power supply monitoring system adopts a hierarchical network structure, and the industrial computer 1 of the central control room operation station, multiple local stations 2 and multiple power supply monitoring modules 3 are all equipped with data cache, thereby improving data parallel capability and greatly improving data refresh speed.

[0026] In at least one embodiment of the present application, reference Figure 3The power supply monitoring module 3 includes a power supply module 31, an analog quantity acquisition module 32, a switch quantity module 33, an external storage module 34, a controller area network communication module 35, a main controller 36 and an RS485 communication module 37. The power supply module 31, the analog quantity acquisition module 32, the switch quantity module 33, the external storage module 34, the controller area network communication module 35 and the RS485 communication module 37 are all connected to the main controller 36. The power supply module 31 is used to provide power for the analog quantity acquisition module 32, the switch quantity module 33, the external storage module 34, the controller area network communication module 35, the main controller 36 and the RS485 communication module 37. The analog quantity acquisition module 32 is used to collect analog quantity signals at the industrial site. The switch quantity module 33 is used to collect relay signals at the industrial site. The external storage module 34 is used to store data obtained by fault recording. The controller area network communication module 35 is used to transmit data of the on-site controller area network node device to the main controller 36. The RS485 communication module 37 is used to transmit the data on the main controller 36 to the local station 2. The main controller 36 is used to obtain and process all monitoring data from the power module 31, the analog acquisition module 32, the switch module 33, the external storage module 34 and the controller LAN communication module 35, and transmit it to the industrial computer 1 of the central control room operation station through the RS485 communication module 37.

[0027] It should be noted that the controller area network communication module 35 may be a CAN communication interface. The RS485 communication module 37 may be an RS485 communication interface. Industrial field analog signals include but are not limited to temperature signals, pressure signals or flow signals. The analog acquisition module 32 may use a high-precision sensor and an analog-to-digital converter (AD converter for short) to ensure the accuracy of the original data.

[0028] In some embodiments, the data obtained by the fault recording includes but is not limited to the capacitor switching state, overexcitation operation time, overexcitation state, real-time input active power after overexcitation, input active power before overexcitation, energy saving effect (percentage), input current before overexcitation, input current after overexcitation, output voltage before overexcitation, output voltage after overexcitation, operating voltage setting value after overexcitation, effect drop reminder after overexcitation (50%), normal operation overexcitation reminder (0.5 hours) and accumulated power saving data. When the effect of the medium frequency power supply drops by 50% after overexcitation, the operating state can be transmitted to the industrial computer 1 of the central control room operation station by sound to remind the on-duty personnel.

[0029] In the embodiment of the present application, the hardware circuit of the power supply monitoring module 3 is designed by adopting a modular concept. According to the functions that the hardware circuit of the power supply monitoring module 3 needs to realize, the power supply monitoring module 3 is configured to be mainly composed of a power supply module 31, an analog quantity acquisition module 32, a switch quantity module 33, an external storage module 34, a controller LAN communication module 35, a main controller 36 and an RS485 communication module 37. The power supply module 31, as the cornerstone of the power supply monitoring module 3, can provide stable and reliable power support for each module of the hardware circuit, thereby ensuring the stable operation of the entire medium frequency grid-connected power supply monitoring system; the analog quantity acquisition module 32 can accurately collect analog quantity signals on the industrial site and convert analog signals such as temperature, pressure or flow into analog signals. The digital signals are converted into digital signals, which ensures the accuracy of the data, provides basic data for subsequent processing and analysis, and lays the foundation for the effective use of data; the switch quantity module 33 can monitor the switch action, so as to grasp the working status of the relay at the industrial site; the external storage module 34 stores the data obtained by the fault recording to ensure the security of the data and the subsequent traceability, which is convenient for calling and problem analysis at any time; the controller LAN communication module 35 can transmit the data of the field controller LAN node device to the main controller 36 through CAN, realizing real-time monitoring and data analysis; the RS485 communication module 37 can upload the data on the main controller 36 to the higher-level local station 2, realizing long-distance and high-speed data transmission.

[0030] In at least one embodiment of the present application, the local station system software is installed on the main controller 36. The local station system software is used to obtain all monitoring data from the power supply module 31, the analog quantity acquisition module 32, the switch quantity module 33, the external storage module 34 and the controller local area network communication module 35, and compare part or all of all monitoring data with corresponding standard data, and send an alarm signal to the local station 2 when the monitoring data is abnormal.

[0031] In at least one embodiment of the present application, all monitoring data include the operating time of the medium frequency power supply and the real-time time. In this way, by setting all monitoring data to include the operating time of the medium frequency power supply, the local station system software records and transmits the operating time of the medium frequency power supply to the industrial computer 1 of the central control room operation station so that maintenance personnel can control the overall operating status of the medium frequency power supply. By setting all monitoring data to include real-time time, the local station system software can upload the real-time time during the monitoring process to the industrial computer 1 of the central control room operation station, thereby ensuring the synchronization of the time of the medium frequency grid-connected power supply monitoring system.

[0032] In at least one embodiment of the present application, the local station system software includes a temperature flow measurement program, a controller area network communication program, an RS485 communication program and a data storage program. The temperature flow measurement program is used to obtain and analyze the temperature signal and flow signal collected by the analog acquisition module 32. The controller area network communication program is used to receive and process the data of the field controller area network node device obtained through the controller area network communication module 35. The RS485 communication program is used to transmit the data on the main controller 36 to the local station 2 through the RS485 communication module 37. The data storage program is used to record various data signals and store them in the external storage module 34 in a compressed and / or encrypted manner. In this way, the temperature flow measurement program is used to reduce the data processing time and improve the accuracy and response speed of temperature and flow monitoring. The controller area network communication program is used to reduce the data transmission delay and improve the concurrent capability of data processing, ensuring efficient data exchange with the controller area network communication module 35. The data storage program is used to increase the data compression and encryption functions to ensure the integrity and security of the data during storage and transmission.

[0033] The temperature and flow measurement program can set a reasonable sampling frequency to balance data accuracy and resource consumption. The external storage module 34 can be a general database.

[0034] The Controller Area Network communication program can be optimized by adopting two-wire serial communication mode, etc., to improve the anti-interference ability of communication and improve the reliable error handling and error detection mechanism. In addition, the Controller Area Network communication program can also add the function of automatically exiting the bus in the case of serious errors. The message does not contain the source address or the destination address, and only uses the identifier to indicate the function information and priority information.

[0035] In at least one embodiment of the present application, the RS485 communication program adopts an optimized handshake protocol and an organization and transmission mechanism. Thus, by setting the RS485 communication program to adopt an optimized handshake protocol, the optimized handshake process is utilized to reduce unnecessary communication overhead and improve communication efficiency. In addition, by setting the RS485 communication program to adopt an organization and transmission mechanism, the communication reliability in a noisy environment is improved.

[0036] It should be noted that the RS485 communication program can also optimize the data packet design, for example, reasonably design the data packet structure, reduce redundant data, and improve data transmission efficiency. The RS485 communication program can also optimize the communication error detection and correction design, for example, using CRC check and other methods to ensure the accuracy of data transmission and reduce the number of retransmissions.

[0037] When the medium frequency grid-connected power supply monitoring system is started, the local station system software can quickly and comprehensively initialize and configure hardware modules such as the power supply module 31, analog quantity acquisition module 32, switch quantity module 33, external storage module 34, controller LAN communication module 35, main controller 36 and RS485 communication module 37 to ensure that all hardware modules operate as expected.

[0038] In at least one embodiment of the present application, the external storage module 34 stores data for no less than 6 months.

[0039] In at least one embodiment of the present application, the host computer system software is installed on the industrial computer 1 of the central control room operation station. The host computer system software is used to aggregate or call the data transmitted by multiple local stations 2 and form alarm signals and protection signals based on the data, and write historical data into the database for storage. In this way, the host computer system software can complete the final data aggregation and monitoring, and respond immediately when the data is abnormal. The alarm signal formed can promptly notify the on-duty personnel of the current status and fault type through graphics or sound.

[0040] It should be noted that the host computer system software can record necessary data signals, store them for no less than 6 months, and update data and monitor them in real time. It can also generate trend charts and historical data curves for historical data or fault data, and print out operation, fault, and alarm records. Both the host computer system software and the local station system software can be designed using high-level languages ​​(such as C++) to implement data communication.

[0041] The host computer system software can control one or more of the multiple monitoring nodes to perform inspections in a preset time (such as 100 microseconds) as a cycle. The host computer system software can optimize the task execution efficiency by optimizing the task scheduling algorithm, for example, evaluating the average time and throughput of task execution to verify the effect of the algorithm in improving execution efficiency. The host computer system software can optimize resource utilization, for example, evaluating the resource utilization and load balancing of the medium frequency grid-connected power supply monitoring system to ensure that resources are used reasonably and efficiently. The host computer system software can optimize the abnormal response speed, for example, evaluating the response speed and processing capability of the medium frequency grid-connected power supply monitoring system to abnormal situations to ensure that potential problems can be discovered and handled in a timely and accurate manner. The host computer system software can optimize the stability and reliability of the medium frequency grid-connected power supply monitoring system, for example, evaluating the stability and reliability of the medium frequency grid-connected power supply monitoring system during long-term operation to ensure that it can meet the monitoring needs of the power system and ensure that key tasks are processed within the specified time.

[0042] In at least one embodiment of the present application, a monitoring interface is provided on the industrial computer 1 of the central control room operation station, and the monitoring interface includes a primary system diagram, a network diagram, a fault record, an alarm record, an operation record, an alarm page and a medium frequency power supply over-excited operation status screen.

[0043] It should be noted that the combination of the various technical features in the embodiments of the present application is not limited to the combination described in the embodiments of the present application or the combination described in the specific embodiments, and all technical features described in the present application can be freely combined or combined in any way unless there is a contradiction between them.

[0044] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A medium frequency grid-connected power supply monitoring system, characterized in that: It includes an industrial computer at the central control room operation station, multiple local stations and multiple power supply monitoring modules. The power supply monitoring module is directly connected to multiple monitoring nodes of the medium frequency power supply using a controller area network, and is used to collect data from the multiple monitoring nodes and perform primary caching; The local station uses an RS485 network to communicate with at least one power supply monitoring module, and is used to collect data from the at least one power supply monitoring module and perform secondary caching; The industrial computer of the central control room operation station communicates with the multiple local stations respectively using Ethernet, and is used to aggregate all data transmitted by the multiple local stations and process and store all data. The power supply monitoring module includes a power supply module, an analog quantity acquisition module, a switch quantity module, an external storage module, a controller area network communication module, a main controller and an RS485 communication module, wherein the power supply module, the analog quantity acquisition module, the switch quantity module, the external storage module, the controller area network communication module and the RS485 communication module are all connected to the main controller. The power supply module is used to provide power for the analog quantity acquisition module, the switch quantity module, the external storage module, the controller area network communication module, the main controller and the RS485 communication module; the analog quantity acquisition module is used to collect analog quantity signals at the industrial site; the switch quantity module is used to collect relay signals at the industrial site; the external storage module is used to store data obtained by fault recording; the controller area network communication module is used to transmit data of the on-site controller area network node device to the main controller; the RS485 communication module is used to transmit data on the main controller to the local station; the main controller is used to obtain and process all monitoring data from the power supply module, the analog quantity acquisition module, the switch quantity module, the external storage module and the controller area network communication module, and transmit them to the industrial computer of the central control room operation station through the RS485 communication module.

2. The medium frequency grid-connected power supply monitoring system according to claim 1 is characterized in that: The data obtained from the fault recording include capacitor switching status, overexcitation operation time, overexcitation status, real-time input active power after overexcitation, input active power before overexcitation, energy-saving effect, input current before overexcitation, input current after overexcitation, output voltage before overexcitation, output voltage after overexcitation, operating voltage setting value after overexcitation, effect degradation reminder after overexcitation, normal operation overexcitation reminder and accumulated power saving.

3. The medium frequency grid-connected power supply monitoring system according to claim 1 is characterized in that: The main controller is installed with local station system software, which is used to obtain all monitoring data from the power supply module, the analog quantity acquisition module, the switch quantity module, the external storage module and the controller LAN communication module, and compare part or all of all monitoring data with corresponding standard data, and send an alarm signal to the local station when the monitoring data is abnormal.

4. The medium frequency grid-connected power supply monitoring system according to claim 3 is characterized in that: All monitoring data include the operating time and real-time time of the medium frequency power supply.

5. The medium frequency grid-connected power supply monitoring system according to claim 3 is characterized in that: The local station system software includes temperature and flow measurement program, controller LAN communication program, RS485 communication program and data storage program. The temperature and flow measurement program is used to obtain and analyze the temperature signal and flow signal collected by the analog acquisition module; the controller area network communication program is used to receive and process the data of the field controller area network node device obtained through the controller area network communication module; the RS485 communication program is used to transmit the data on the main controller to the local station through the RS485 communication module; the data storage program is used to record various data signals and store them in the external storage module in a compressed and / or encrypted manner.

6. The medium frequency grid-connected power supply monitoring system according to claim 5, characterized in that: The RS485 communication program adopts an optimized handshake protocol as well as an organization and transmission mechanism.

7. The medium frequency grid-connected power supply monitoring system according to claim 1, characterized in that: The external storage module stores data for no less than 6 months.

8. The medium frequency grid-connected power supply monitoring system according to any one of claims 1 to 7, characterized in that: The host computer system software is installed on the industrial computer of the central control room operation station. The host computer system software is used to summarize or call the data transmitted by multiple local stations and form alarm signals and protection signals based on the data transmitted by multiple local stations, and write historical data into the database for storage.

9. The medium frequency grid-connected power supply monitoring system according to any one of claims 1 to 7, characterized in that: A monitoring interface is provided on the industrial computer of the operation station in the central control room, and the monitoring interface includes a primary system diagram, a network diagram, a fault record, an alarm record, an operation record, an alarm page and a medium frequency power supply overexcited operation status screen.

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