Abstract: The Qilu University of Technology project uses smart power meters to collect various electrical parameters and switching signals at the distribution site. The system adopts on-site local networking method. After networking, it communicates via the field bus and transmits it to the background. The Acrel-3000 power management system realizes the real-time monitoring and management of the power distribution circuit of the distribution board.
Keywords: Qilu University of Technology; Power Distribution Institute; Intelligent Power Meter; Acrel-3000; Power Management System;
0 Overview
   The location of the Heze Campus of Qilu University of Technology is located in the north of Beiwaihuan of Heze City, east of the planned Botanical Garden, west of planned Mudan Road and south of the East Ridong Expressway. The total planned land area is 1,435 mu, of which the project covers an area of ​​1,204 mu, with a total construction area of ​​470,000 square meters and a total investment of 2.4 billion yuan. The project will be completed in two phases. The first phase will consist of 6,000 students and 568 acres of land. The second phase will reach 15,000 people. All projects will be completed by the end of 2018.
This project undertakes its power management system for power distribution and distribution, including a 35/10kV substation, four 10/0.4kV substations, and a monitoring host located in the 35/10kV main station monitoring room.
1 demand analysis
   In order to ensure the statistical analysis of electricity load for teaching management and real-time monitoring of hazards, it is necessary to carry out real-time on-line monitoring of voltage, current, and power parameters of high and low voltage distribution cabinets in schools substations. Once monitoring points are displayed with abnormal parameters, Alarms can be issued in a timely manner and relevant personnel take necessary measures to avoid safety accidents. The automatic meter reading function saves manpower and material resources, and the current trend curve function can intuitively display the working status and time of each loop, so that the user can find the abnormal power consumption circuit and carry out timely rectification. The Acrel-3000 energy management system is highly safe and reliable, easy to expand, and easy to maintain and maintain.
data collection
   It automatically collects the analog data of all the electricity meters at the site and automatically collects the on-off status such as on-site switch status and fault status.
   Supports real-time acquisition, automatic cycle acquisition (timing acquisition), configurable period (1 minute to 24 hours).
   Support multi-thread processing mechanism, improve data collection efficiency, and data acquisition for multiple devices at the same time.
   The real-time display of data adopts the visual display mode of the main wiring diagram of the power distribution room, and the disconnection and fault status of each loop can be seen directly.
Data analysis and processing
   Comprehensive statistics and analysis of data need to achieve the following functions:
   The statistics and calculations for hours, days, months, and years of electricity data for each device. Statistics on the power usage of each sub-station and the whole.
Data query and display
   Requirements can facilitate the implementation of client inquiries and inquiries at all levels of management personnel, query interface can adapt to the requirements of all levels of management personnel can support flexible conditional combination of query and comparative analysis, various types of statistical analysis of data can be used flexibly using reports and other charts Intuitive display function.
   The data display function is divided into three layers for operation level, management level, and decision level according to the different permissions of different users.
authority management
   Requirements for different users to give different roles, can be authorized to function submenu, specific file records, data records.
   The system requires a reasonably complete user security control mechanism, which can effectively protect the information resources in the application environment and prevent the loss, theft and destruction of information.
parameter settings
   Through the collection cabinet can set the loop transformer ratio, a variety of current and voltage protection settings.
   Fault judgment and alarm have automatic fault judgment and use sound and light alarm function. The types of alarms include switch failures, voltage and current overruns, on-site acquisition module communication failures, and monitoring system communication failures. The alarm time is automatically entered into the system database to facilitate the user's query. The staff can always grasp the realizing the power distribution station.      At the time of operation, it was found that the faults in the power distribution and distribution operations were handled and correspondingly dealt with to improve the management efficiency of the power distribution and distribution, and improve the safety and reliability of the power system.
2 system solutions
   Acrel-3000 power management system According to the actual situation of Qilu University of Technology, the overall network structure is directly connected to the serial port server of the power distribution station by shielded twisted pair and then directly connected to the monitoring host of the monitoring room, ensuring the transmission of the power management system of the distribution center. Stability and real-time performance. As shown in the following figure: Station management layer, network communication layer and field device layer.
System structure
   There are 18 PZ80-E4/CK incoming power meters and 494 AMC72L-E4/CK outgoing power meters in the field power distribution station. A total of 17 RS485 buses are connected to the 4 serial servers of the power distribution station, and the serial server directly passes through. Super five cable or optical fiber connected to the monitoring room monitoring host.
1) Station control management
   Station management's management personnel for power management systems are a direct window for human-computer interaction. In this project, it refers to the industrial control monitoring host placed in the monitoring room in the substation.
2) Network communication layer
   The communication layer consists of four serial-port servers, Ethernet devices, and a bus network. The main function of the serial server is to monitor the field smart meters; the main function of the Ethernet equipment and the bus network is to realize the data exchange between the power distribution room and the main station, so that the distribution system management is centralized, informatized, and intelligent, and the The safety, reliability and stability of the distribution system have been improved and the unattended purpose has been achieved.
3) Field device layer
   The field device layer is a data collection terminal, which is mainly composed of smart power meters. The smart device is connected to the serial port server through a shielded twisted pair RS485 interface using a Modbus communication protocol bus type, and the communication server reaches the power distribution room monitoring host for networking. Realize remote control.
The smart device is connected on-site to indicate that the on-site device is connected in a hand-in-hand manner through a shielded twisted pair (RVSP2*1.0). Each bus connects about 20 intelligent devices. Different types of smart devices are connected to different buses. The data is uploaded to the serial server and the data is then uploaded to the IPC of the monitoring room. The specific connection diagram is as follows:
Communication line connection diagram
   The 0.4kV line-in circuit adopts PZ80-E4/CK multi-functional smart meters, and the outlet circuit adopts AMC72L-E4/CK smart meters. Both are network power meters designed for the power management needs of power systems, public facilities and smart buildings. Can measure all conventional power parameters, such as: three-phase voltage, current, active power, reactive power, power factor, frequency, active power, reactive power.
All smart devices can meet the requirements for interacting with the monitoring host data via the bus.
3 system function
   The real-time monitoring system diagram of the power distribution system is the main monitoring screen, which mainly monitors the running status of all loops of the power distribution system in real time. In the system diagram, you can intuitively see the operating parameters and status of each incoming and outgoing line. You can see all the conventional power parameters on the outgoing side of the transformer, such as: three-phase voltage, current, active power, reactive power, power factor , frequency, active power, etc. As shown below:
Distribution Station System Diagram
   The parameter reading function mainly inquires into the electrical parameters of the low-voltage outlet circuit. Supports electrical parameter query at any time, with functions such as data export and report printing. This report inquires about the electrical parameters of each low-voltage circuit in the transformer inlet and outlet lines of the Qilu University of Technology. It mainly includes: three-phase current, active power, and active power. The names of the loops in this report are associated with the database to facilitate the user to modify the loop name. As shown below:
Electrical parameter reading
   The electricity consumption report function can select the time period to inquire, supports the accumulated electricity inquiry at any time, and has the functions of data export and report printing. Provide accurate and reliable power report for duty personnel. The names of the loops in this report are associated with the database to facilitate the user to modify the loop name. As shown in the figure below, the precise power consumption of the distribution circuit can be displayed. The user can print the report directly or save it to another location for other purposes. As shown below:
Energy report
   The schematic diagram of the system communication structure mainly shows the networking structure of the system. The system adopts a hierarchical distributed structure and simultaneously monitors the communication status of the equipment at the bay level. Red indicates normal communication and green indicates abnormal communication. The following figure shows the communication status of the substation.
Communication structure diagram
   The trend curve provides an intuitive view of the load operation of the loop. View real-time and historical trend curves, click the corresponding button or menu item of the screen to complete the switching of corresponding functions; help the user to perform trend analysis and fault recall, with curve printing function. Provides intuitive and convenient software support for analyzing the health of the entire system. As shown below:
Trend graph
4 Conclusion
   In the application of power distribution facilities today, the distribution security of buildings in public buildings is very important. The application of the Acrel-3000 energy management system introduced in Qilu University of Technology can realize the power distribution circuit for power distribution stations. The real-time monitoring of electricity can not only show the power status of the circuit, but also has network communication functions. It can be used to provide power management functions with serial servers, computers, etc. The system can analyze and process the collected data and display the real-time information in the distribution center. The operating status of the electric circuit, and the generation of various energy reports, analysis curves, graphics, etc., to facilitate remote meter reading and analysis, research, the system is safe, reliable, stable, and provides a true analysis and monitoring of electricity in colleges and universities Reliable basis.
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