Design and application of remote monitoring and maintenance system for DC power supply in smart substation_chuanyang electric Co., ltd.
Design and Application of Remote Monitoring and Maintenance System for DC Power Supply in Smart Substation
Date of publication: 2016-12-13
1 Introduction Because the degree of comprehensive automation in substations is getting higher and higher, and unattended substations have become a trend, and the DC power supply system directly provides basic source power for other automation devices, so once the DC power supply itself has problems, problems will follow. It is protection failure, switch refusal, channel interruption. the consequences are unimaginable.In recent years, major power accidents caused by DC power supply problems have occurred from time to time, leading to major economic losses, and DC remote monitoring systems have also been introduced.The DC remote monitoring system monitors the operating status of the DC charger, battery cell voltage, internal resistance, temperature, control bus voltage, closing bus voltage, control bus grounding, air switch trip detection and other important power characteristics parameters in real time. The charging and discharging test of the remote control battery, once the DC power supply status is found to be abnormal, an audible and visual alarm will be issued immediately, and it will be directly reported to the DC monitoring center via Ethernet, or even directly to the person in charge, so that the person in charge will be notified at the first time for timely processing. So as to avoid major electrical accidents. 2.System overall design 2.1 Overview The monitoring terminal device connects the voltage collector, switch module, bus insulation monitoring module, discharge load and other equipment together through the RS485 bus, and collects all their signals together for unified management, and can be managed through optical fibers The LAN port or the spare serial port of the optical transceiver transmits all the collected information to the central server software. The server software stores and manages the information and distributes the information to the computers of each relevant management post, and makes it possible to browse all of the computers on the LAN. Information, provide hierarchical management password, can change the information and parameters of any substation, and provide related remote control.At the same time, it is responsible for local data storage, real-time display, settings, tables, queries, alarms and other man-machine operation interface control, and the monitoring center receives the data from the monitoring terminal for analysis and processing. 3. System composition 3.1 Local monitoring device The monitoring device uses a 32-bit ARM processor NXPLPC23xxARM7TDMIMCU as the new main controller chip. The chip has rich resources on-chip, a high-performance processor with a 60M clock frequency, 512KFlash, 98KRAM, and 4 UART, 2 I2C, 2 SPI, 10/100 network card and other resources are very suitable for use as a communication main controller. The display adopts 5.7-inch 480×272 high-resolution true-color TFT LCD screen, the keyboard adopts 4-key operation (2 up and down keys + 2 function soft keys), each step corresponds to the key function description, the operation is free, intuitive and convenient, without too much training. Resource allocation: UART0 communication port is used for local debugging or dispatch terminal upload or connection to other intelligent communication devices, UART1 and UART2 are RS485 interfaces for collecting the voltage of two sets of batteries, and UART2 can be used to connect other intelligent communication devices (such as chargers, etc.) ), UART3 is used for local color LCD display interface, 10/100 network communication interface is used for local debugging or scheduling upload. The monitoring device can directly display information such as the control bus voltage, closing bus voltage, feeder branch switch status, and battery pack temperature. You can view the current voltage of each battery in the form of a table, and view and change the control information such as the relevant settings of the acquisition module. , Carrying out DC main circuit state switching, battery capacity and internal resistance test, all adopt Chinese interface, easy to operate, powerful, and rich in reports. 3.2 Voltage collector Voltage collector part: The collector uses TI’s MSP430F2013 as the main controller. This controller is a 16-bit high-performance simple instruction single-chip microcomputer with a 16-bit high-precision A/D converter and a 16M clock frequency. The instruction efficiency is quite high, all are written in high-efficiency C++ code, which is easy to maintain and upgrade the code. 3.3 Bus insulation monitoring module The bus insulation monitoring module uses TI’s MSP430F2013 as the main controller and uses the 485 bus to communicate with the monitoring device. It can monitor the ground insulation resistance of the positive control bus and the negative control bus at the same time, and it can also measure the positive and negative. Control the voltage to the ground of the bus, directly determine the grounding of the positive control bus or the ground of the negative control bus, and measure the total voltage of the control bus. 3.4 Switch quantity monitoring module This module adopts TI company MSP430F2012 as the main controller. It has a decentralized installation structure and uses 485 bus to communicate with the monitoring device. Each module can monitor 8 switches at the same time, and each switch is photoelectrically isolated. , Isolation voltage 4000V, minimum time of switching value judgment 1ms, software anti-jitter processing can be set, hardware anti-interference measures are provided, and the main working power supply is provided by the communication power supply. 3.5 Introduction to DC discharge load DC load can perform load discharge and internal resistance test on two groups of batteries, equipped with 4 control outputs, can complete battery pack virtual offline, battery pack discharge, internal resistance measurement, battery pack switching, bus parallel Wait for remote control operation. 3.6 Alarm notification device The alarm notification device uses SIEMENSGPRS/GSMMODEM by default. It is connected to the installation server via RS232, supports China Mobile and China Unicom SIM cards, and the alarm notification method uses SMS.. 3.7 Server software The server software is responsible for communicating with the monitoring terminal of each substation, receiving all the data sent by the monitoring terminal, and storing the alarm data sent by each substation and the historical data that needs to be saved, and querying the settings of each device, Change the settings of each device. Server software adopts MSVC++6.0 development, all using high-efficiency C++ code. Use MicroSoftSQLServer2006 database as the database server. 3.8 System monitoring software The system monitoring software is responsible for monitoring and browsing the data sent by all monitoring terminals. It can set the DC system simulation diagram of each substation, and can directly display the control bus voltage and closing bus voltage on the simulation diagram. You can view the current voltage of each battery in the form of a table for the operating status of each MCB and the temperature of the battery pack, or you can compare it in the form of a curve or a table, view the historical operating curve and other functions, view and remotely change the field collection The remote control information such as the related settings of the module, all adopt the Chinese interface, easy to operate, powerful, and rich in reports. Each information and position signal on this interface completely dynamically indicates the working status of the actual equipment (including feeder circuit breaker status, charger status, grounding status, bus voltage, load current, switch status, AC working status, AC voltage, bus voltage, etc. Information), and the configuration design is adopted. Users can change the simulation diagram according to the actual changes of the substation site. As long as the corresponding relationship between the signals is simply set, the dynamic display of the new signals can be realized.. l Remote charger parameter setting and equalized floating charge conversion can remotely change the equalized floating charge voltage parameters of the charger and remotely change the equalized floating charge state of the charger. If the DC screen supports more settings, you can add more parameters according to the actual parameters on site. l Remote discharge and remote control interface: This interface can remotely set the total voltage protection value of the battery pack of the constant current discharge module, discharge current, discharge capacity protection value, discharge time protection value, single battery voltage protection value and other heavy voltage protection conditions , Command to start or stop the discharging operation to realize the remote check capacity test operation. After starting the discharge, you can view the current discharge progress, discharge capacity, total voltage of the battery pack, minimum voltage of the battery and other important parameters of concern during the discharge process, and can be realized Bus operation mode switching and other operations. Note: Realization of remote discharge requires the cooperation of relevant hardware. Use the blue wide bar to display the current internal resistance of this battery, and the green narrow bar to display the factory internal resistance or set standard value of this battery, which is convenient for users to compare and analyze the changes in battery internal resistance and find outdated batteries in time. This interface can view the voltage and temperature of the single battery in real time, and can set the upper and lower limits to view the backward batteries. The batteries below the lower limit will be displayed in yellow, and the batteries above the upper limit will be displayed in red. Convenient for users to quickly and intuitively screen out backward batteries. This interface makes it easy to view and compare historical analog data within 1 year. You can choose the analog data corresponding to each curve, choose the date, start time, report time interval, etc., and you can flexibly report and print directly. System monitoring software adopts MSVC++6.0 written high-efficiency C++ code. 4 End of today’s current substation DC power supply system management status is still relatively backward, and is not compatible with the intelligent development of substations. This product has been put into operation in the Gengzhuang 220KV substation in 2008, and it has brought a lot to the DC maintenance work. Great convenience; it is foreseeable that the promotion of the DC power supply remote monitoring and maintenance system will have broad application prospects, which will bring direct benefits to various production units to improve production efficiency and save costs, and provide more reliable guarantees for the operation of intelligent stations.
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