This paper introduces the Suzhou City School of Art Power Management System, which uses intelligent power meters to collect various electrical parameters and switching signals from the power distribution site. The system adopts the on-site local networking mode. After networking, it communicates through the fieldbus and travels to the background. Through the Acrel-3000 power management system, the real-time monitoring and power management of the power distribution circuit is realized.
Ankerui Electric Co., Ltd., Jiading, Shanghai 201801, China
Abstract: This paper introduces the energy management system of Suzhou Art School, which uses intelligent power meters to collect various electrical parameters and switching signals from the power distribution site. The system adopts the on-site local networking mode. After networking, it communicates through the fieldbus and travels to the background. Through the Acrel-3000 power management system, the real-time monitoring and power management of the power distribution circuit is realized.
Keywords: school; Suzhou City School of Art Power Management System; Substation; Intelligent Power Meter; Acrel-3000; Power Management System
Suzhou City Art School Power Management System Project is located at 1859 Binhe Road, Gaoxin District, Jiangsu Province. This project is the power management system of Suzhou Art School. According to the requirements of power distribution system management, it is necessary to manage the power supply of the low-voltage distribution in the main substation of Suzhou Art School to ensure the safety, reliability and efficiency of electricity consumption.
The Acrel-3000 low-voltage intelligent power distribution system makes full use of the latest developments in modern electronic technology, computer technology, network technology and fieldbus technology, and performs distributed data collection and centralized monitoring and management of the power distribution system. The secondary equipment of the power distribution system is networked, and the field devices of the distributed power distribution stations are connected as an organic whole through the computer and the communication network to realize remote monitoring and centralized management of the power grid operation.
1 System structure description
The monitoring system mainly realizes the electricity monitoring and power management of the 0.4kV power distribution system of a substation of Suzhou Art School. The system has a total of 29 instruments (including 2 ACR220ELH, 27 PZ72L-E4/KCP), divided into 2 buses, directly pulled to the substation duty room monitoring host to achieve data connectivity between the meter on the bus and the monitoring host.
The monitoring system adopts a layered distributed structure, that is, a station control layer, a communication layer and a space layer;
As shown in Figure 1:
Figure (1) Network topology diagram
The interval device layer is mainly: multi-function network power meter. These devices are respectively installed in the electrical cabinet corresponding to the corresponding primary equipment. These devices all adopt RS485 communication interface, and realize on-site data collection through the on-site MODBUS bus networking communication.
The network communication layer is mainly: communication server, its main function is to collect the scattered devices in the field, and remotely transmit to the station control layer to complete the data interaction between the field layer and the station control layer.
Station control management: equipped with high-performance industrial computers, monitors, UPS power supplies, printers and other equipment. The monitoring system is installed on the computer to collect and display the running status of the field device and display it to the user in the form of human-computer interaction.
The above network instruments adopt RS485 interface and MODBUS-RTU communication protocol, RS485 adopts shielded line transmission, generally adopts two connections, the wiring is simple and convenient; the communication interface is half-duplex communication, that is, both sides of the communication can receive and send data but Only data can be sent or received at the same time, and the maximum data transmission rate is 10Mbps. The RS485 interface is a combination of balanced driver and differential receiver. It has enhanced noise immunity and allows up to 32 devices to be connected on the bus with a maximum transmission distance of 1.2km.
2 main functions of power monitoring system
2.1 Data Acquisition and Processing
Data collection is the basis of power distribution monitoring. Data acquisition is mainly completed by the underlying multi-function network instrument, realizing local real-time display of remote data. The signals that need to be collected include: three-phase voltage U, three-phase current I, frequency Hz, power P, power factor COSÏ†, electrical Epi, and remote device operating status.
The data processing mainly displays the electrical parameters collected as required in real time to the user, and achieves the automation and intelligent requirements of the power distribution monitoring. At the same time, the collected data is stored in the database for the user to query.
2.2 Human-computer interaction
The system provides a simple, easy to use, and good user interface. Using the full Chinese interface, the CAD graphic shows the electrical main wiring diagram of the low-voltage power distribution system, showing the status of the power distribution system equipment and the corresponding real-time operating parameters, the screen timing wheel patrol switching; the screen real-time dynamic refresh; analog quantity display; switch quantity display; continuous Record display, etc.
2.3 Diachronic events
The diachronic event viewing interface mainly provides convenient and friendly human-computer interaction for the user to view the fault records, signal records, operation records and over-limit records that have occurred. Through the historical event viewing platform, you can conveniently locate you according to your own requirements and query conditions. The historical events to be viewed provide good software support for you to grasp the operation of the entire system.
2.4 Database Establishment and Query
It mainly completes remote measurement and remote signal timing collection, and establishes a database to generate reports on a regular basis for users to query and print.
2.5 User Rights Management
For different levels of users, set different permission groups to prevent the loss of production and life caused by human error, and achieve safe and reliable operation of the power distribution system. Users can log in, log out, change passwords, add deletes, etc. through user management, which is convenient for users to modify accounts and permissions.
2.6 Operating load curve
The load trend curve function is mainly responsible for timing the incoming line and important loop current and power load parameters, and automatically generating the running load trend curve, which is convenient for the user to know the running load status of the equipment in time. Click the corresponding button or menu item to complete the corresponding function switching; you can view the real-time trend curve or historical trend line; you can perform translation, zoom, range conversion and other operations on the selected curve to help users enter the line trend analysis and fault recall. Analysis of the health of the entire system provides intuitive and convenient software support.
2.7 Remote Report Query
The main function of the report management program is to design the report style according to the needs of the user, and filter the data processed in the system to generate the report data required by the user. The program can also use the timed save, print or summon save and print mode for the report file according to the user's needs. At the same time, the program also provides users with the function of generating report file management.
The report has the function of freely setting the query time to realize the energy statistics, data export and report printing of day, month and year.
3 Case analysis
The Suzhou Art School's power management system has a total of a substation. The project manages the power of the substation's 0.4kV power distribution system for remote real-time monitoring and power management.
The ACR220ELH multi-function harmonic instrument is used in the incoming circuit of the power distribution station. It is a network power meter designed for power monitoring needs of power systems, industrial and mining enterprises, public facilities, and intelligent buildings. It can measure all conventional power parameters, such as: Phase voltage, current, active power, reactive power, power factor, frequency, active power, reactive power, and can monitor a variety of electrical parameters such as 2-31 harmonic components of voltage and current. And the instrument has 4 photoelectric isolation switch input contacts and 2 relay control output contacts, these contacts can be used with the intelligent circuit breaker to realize the remote signaling and remote operation of the circuit breaker. This series of network power meters are mainly used in substation automation, distribution network automation, residential power monitoring, industrial automation, energy management systems and intelligent buildings.
The important distribution circuit adopts PZ72L-E4/KCP series network power meter, which mainly measures all conventional power parameters, such as: three-phase voltage, current, active power, reactive power, power factor, frequency, active power, reactive power Electricity.
The secondary diagram of low-voltage power distribution is shown in Figure (2). The function has electric power telemetry. It mainly monitors the electrical parameters of the running equipment, including: line three-phase voltage, current, power, power factor, electric energy, frequency and other electrical parameters and the distribution loop. Three-phase current; the remote signal function realizes the operation status of the field device, including: the switch's branching and closing operation status and communication fault alarm; when the circuit breaker is displaced, an alarm signal will be sent to remind the user to handle the fault in time.
Figure (2) Low-voltage power distribution quadratic diagram
The parameter meter reading function mainly queries the electric parameters of the low-voltage outlet circuits. Supports electrical parameter query at any time, with functions such as data export and report printing. The report queries the electrical parameters of each low-voltage circuit of a transformer outlet for a substation, including: three-phase current, active power, active power and transformer temperature. The loop name of the report is associated with the database, which is convenient for the user to modify the loop name. See picture (3).
Figure (3) Parameter reading
The power consumption report function can select the time period for query, support the electricity cumulative query for any time period, and have the functions of data export and report printing. Provide accurate and reliable energy reports for duty personnel. The loop name of the report is associated with the database, which is convenient for the user to modify the loop name. As shown in the figure below, the precise power consumption of each power distribution circuit allows the user to directly print the report and save it to other locations in EXCEL format. See Figure (4).
Figure (4) Energy report
The schematic diagram of the system communication structure mainly shows the networking structure of the system. The system adopts a layered distributed structure and monitors the communication status of the interval layer devices. Red indicates normal communication and green indicates communication failure. See picture (5).
Figure (5) Schematic diagram of system communication structure
The load trend curve interface can be used to visually check the load operation of the loop. View real-time and historical trend curves, click the corresponding button or menu item on the screen to complete the corresponding function switching; help users to enter the trend analysis and fault recall, with curve printing function. Provides intuitive and convenient software support for analyzing the health of the entire system. See Figure (6).
Figure (6) Trend graph
With the development of society and the wide application of electric power, the power monitoring system has become an inevitable choice for large-scale multi-substation users such as key projects, landmark buildings/large public facilities throughout the country. The Acrel-2000/3000 power introduced in this paper. The application of monitoring and power management system in Suzhou Art School can realize real-time monitoring and power management of the power supply of high and low voltage distribution circuits in substations, not only showing the power consumption of the circuit, but also having the network communication function, which can be connected with the serial port server. , computer and other components of the power monitoring system. The system realizes the analysis and processing of the collected data, displays the running status of each power distribution circuit in the substation in real time, and generates various energy reports, analysis curves, graphs, etc., which facilitates remote meter reading, analysis and research of electric energy. The system is safe, reliable and stable, and provides a reliable and reliable basis for the users of the substation to solve the problem of electricity consumption, and has achieved good social benefits. 
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About the Author
Yang Junjun, female, undergraduate. Position: Now working for Ankerui Electric Co., Ltd., contact number, mobile phone, QQ
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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