The Suzhou Institute of Biomedical Engineering Technology (hereinafter referred to as the Medical Institute) of the Chinese Academy of Sciences is located in the Suzhou Science and Technology City on the shore of the Taihu Lake in the Suzhou High-tech Zone. Policies and measures to better monitor and manage the distribution system. Therefore, a background power monitoring and power management system has been established to intelligently manage power distribution.
1 System design The substation and distribution system is mainly managed by substations in zone A and substation B to provide the power required by the entire medical laboratory. There is a duty room near the substation in zone A for real-time viewing and processing On the spot, the entire medical staff occupies a relatively large area, and the electricity in another area is provided by the substation in area B. Therefore, in order to realize the real-time monitoring of the entire power system of the medical laboratory and the power management of the electricity used in each district, a monitoring center was established in the duty room. Based on the background of the power monitoring and power management system of ACREL-3000, the entire power distribution system was realized. Real-time monitoring and power management.
1.1 System structure
Acrel-3000 power monitoring and power management system uses monitoring host, communication equipment, measurement and control unit as basic tools, and provides a basic platform for real-time data collection, switch status monitoring and remote management and control of large public buildings. The equipment constitutes an arbitrarily complex monitoring system. The system mainly uses a layered distributed computer network structure, as shown in Figure 1: station control management layer, network communication layer and field device layer [1].
1) Station control management The station control management is the direct window of human-computer interaction for the management personnel of the power monitoring system, and it is also the uppermost part of the system. It is mainly composed of system software and necessary hardware equipment, such as industrial computers, printers, and UPS power supplies. The monitoring system software has a good human-computer interaction interface. It calculates, analyzes and processes all kinds of collected data information on the scene, and reflects the running status of the scene by means of graphics, digital display and sound.
Monitoring host: used for data collection, processing and data forwarding. Provide data interfaces for inside or outside the system for system management, maintenance and analysis.
Printer: The system calls for printing or automatic printing of graphics, reports, etc.
UPS: Ensure the normal power supply of the computer monitoring system. When there is a power supply problem in the entire system, ensure the normal operation of the station control management equipment and provide sufficient time for data storage.
2) The communication layer of the network communication layer is a serial expansion card. This layer is a bridge for data information exchange. It is responsible for collecting, classifying, and transmitting the data information returned by the field devices, and at the same time, conveys various control commands of the host computer to the field devices.
Communication medium: The system mainly uses shielded twisted pair, RS485 interface, MODBUS communication protocol to achieve real-time communication between field equipment and host computer.
3) Field device layer The field device layer is a data collection terminal, which is mainly composed of intelligent instruments. It adopts a distributed I / O controller with high reliability and a field bus connection to form a data collection terminal, and uploads the collected data to the data center. . The measuring instrument is responsible for the most basic data collection task, and the monitored data must be complete, accurate and transmitted to the monitoring host in real time.
1.2 For field protection of the medium-voltage 10kv circuit, the on-site instrument adopts a microcomputer relay protection device to realize the over-current breaking protection of the line, and has the functions of remote measurement and remote signaling. Switching quantity: signals such as circuit breaker on-off status and isolation handcart position. For the energy measurement of this loop, the ACR220EL power meter is used to collect and measure the electrical parameters. The main electrical parameters collected are three-phase voltage, three-phase current, active power, reactive power, active power, reactive power and frequency, Power factor, etc.
For the 0.4kv transformer outlet circuit, the ACR220EL power meter is used. The ACR220EL multi-function meter is embedded installation and can be installed on the power box or low-voltage outlet cabinet door panel. The panel size is 80mm × 80mm and the specification is 220 / 380V 5A, the current is connected through the transformer, and the accuracy is 0.5. It is widely used in high and low voltage incoming cabinets, liaison cabinets, outlet cabinets, power cabinets, etc., with RS485 interface, Modbus communication protocol [2].
2 System function The host computer software is Acrel-3000 power monitoring and energy management system configuration software. This software is a special software for collecting and monitoring on-site electrical parameter data. The biggest feature is its flexible and diverse "configuration form" Rather than programming for system integration, it provides a good user development interface and a simple engineering implementation method, as long as the pre-set various software modules are simply "configured", it can be easily achieved and completed On-site data collection and monitoring functions. The Acrel-3000 power monitoring and power management system has a friendly human-computer interaction interface. It can collect real-time and regular on-site electrical parameters and switching values ​​of field devices, and upload the collected data to the monitoring host for real-time display and storage. The system also provides real-time curve and historical trend curve analysis, reports, event records and fault alarms that meet user design needs [3]. The whole system can realize the collection and statistics of power consumption of all loops, and realize the functions of remote automatic meter reading, power monitoring and power management.
1) Data collection and display The field instrument measures and collects loop data information. The host computer software then collects and stores the field instrument data regularly or periodically. You can freely set the collection time period and the minimum collection period supported by the system. You can view the instantaneous meter value and accumulated amount of any meter at any time, and record the voltage, current, power factor and active power of the power meter within the time interval. These parameter information can be automatically saved in the database for easy query.
The system has a friendly man-machine interface, which is convenient for ordinary on-site personnel to view and record relevant information. The system's primary diagram not only shows the switch status of the line, but also displays important power parameters such as voltage, power, and active power in real time. All data information is regularly saved in the database.
2) The remote meter reading system can display all the collected data in real time and save it in the database, so you can manually query all real-time and historical electrical parameter data of each loop and display it to the user in the form of a table, which is convenient Print and save.
3) The active energy data collected by the energy report and the bar graph system will automatically generate daily reports, monthly reports and annual reports according to the name of the circuit and have a report printing function. Query and print the electricity consumption, and these reports can also be exported in Excel format.
The system can also form annual electricity bar graphs, monthly electricity bar graphs and daily electricity bar graphs for each loop's electricity consumption according to the time according to the generated electricity report, which is easy to view.
4) Current trend curve For important circuits, not only can the current be displayed and monitored in real time, but also a trend curve can be made based on the saved historical data, you can view the real-time and historical change trends, predict power load capacity, and can perform power failure Query to ensure the safe operation of electrical loads.
5) Event records and alarms are mainly used to view historical alarm information; help users to query and recall accidents; support historical query, printing and other functions. Real-time alarm information will pop up instantly to remind the user of the operation. And has an automatic event recording function for all operations.
3 Conclusion With the development of intelligent buildings and the widespread application of electricity, the intelligent integrated management of the distribution system of intelligent buildings has become an inevitable trend for the intelligent construction of national government office buildings and large public buildings. This article introduces ACREL-3000 The electric power monitoring and electric energy management system can not only display the power running status and power consumption status in real time, but also analyze and process the data, display it in a user-appropriate manner, meet the needs of users, and realize the analysis and processing of collected data. It generates a variety of electrical energy reports, analysis curves, graphics, etc., which greatly facilitates the use of users, facilitates real-time monitoring of power distribution systems, and remote meter reading and analysis of electrical energy, providing reference for energy-saving technologies in intelligent buildings.
references
[1] Wang Bin, Du Yundong et al. Design and application of large-scale public building energy consumption monitoring system based on Acrel-5000 [J]. Intelligent Building Electrical Technology. 2009.3 (5)
[2] Ren Zhicheng Zhou Zhong. Principles and Application Guide of Electric Power Measurement Digital Instruments [M]. Beijing. China Electric Power Press. 2007. 4
[3] Zhou Zhong. Du Yundong. The application of electric power meters in the electric energy sub-metering of large public buildings [J]. Modern Building Electric 2010. 6
About the Author:
Yu Jing, female, undergraduate, engineer of Wuhan Ankerui Electric Co., Ltd., the main research direction is intelligent power monitoring and power management system
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