Introduce the Ankerui power management system, using intelligent power meters to collect various electrical parameters of the power plant and the power distribution site of the production workshop. The system adopts the on-site local networking mode. After the network is connected, it is transmitted to the monitoring background through fieldbus communication. Through the power management system, real-time monitoring and management of the power distribution circuit of the substation is realized.
Yang Junjun
Ankerui Electric Co., Ltd., Jiading, Shanghai 201801, China
0 Overview
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Since its establishment in 2002, Zibo Luorui Fine Chemical Co., Ltd. has been committed to the development and production of chemical and pharmaceutical intermediates based on the business philosophy of relying on scientific and technological strength and integrating industry and trade.
The project has two power distribution cabinets in the power room and production workshop. A total of 30 0.4KV circuits need to be monitored.
1, customer needs
Because the on-site power distribution cabinets are distributed in two workshops, it brings inconvenience to the electricity management personnel, and the following requirements are made according to their actual conditions:
1. The main purpose of this design and integration is to centrally manage distributed power distribution and realize data sharing.
2. When the current of each loop exceeds the limit, it cannot be known by the management personnel in real time. There is a hidden danger in the safe use of electricity, and the system needs to realize the sound and light alarm function.
3. Real-time monitoring of real-time current, voltage, and power fluctuations of main transformers and direct transformers.
4. Ability to view the daily electricity consumption of a specific loop or several loops, and compare them with the report.
According to the needs of users, it is necessary to network the production workshop and the power room distribution cabinet and establish a power management system (mainly real-time monitoring of data), set up a monitoring platform in the control center duty room, and monitor and count 30 0.4KV loops in real time. And analysis to ensure safe, reliable and efficient use of electricity.
Ankerui Power Management 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 variable power distribution systems. 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.
2 system structure description
The system adopts layered and distributed structure for design, namely station management layer, network communication layer and field equipment layer. The project network diagram is as follows. The PZ80L-E4 network power meter at site 2 is connected to the serial port server via RS485 field bus. Then, it is transmitted to the on-site monitoring host through Ethernet to realize data collection, storage, processing, display and upload as shown in Figure (1):
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Figure (1) Network topology diagram of power management system
The interval device layer is mainly: PZ80L-E4 multi-function network power meter, which is correspondingly installed in the distribution cabinet of two workshops corresponding to the corresponding primary equipment. These devices all adopt RS485 communication interface and realize the communication through the field MODBUS bus network. Data collection on site.
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.
After the completion of the construction, the multi-function network power meter adopts 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 communication It can receive and send data but can only send or receive data at the same time. 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.
3 main functions of the power management system
3.1 Data Acquisition and Processing
Data collection is the basis of power management. 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 COSφ, electrical Epi, and remote device operating status.
The data processing mainly displays the electric parameters collected as required in real time and accurately to the user, and achieves the automation and intelligent requirements of the electric energy management, and simultaneously stores the collected data into the database for the user to inquire.
3.2 Historical events
The historical event viewing interface is mainly for users to view the fault records, signal records, operation records, and over-limit records that have been made to provide convenient and friendly human-computer interaction. Through the historical event viewing platform, you can easily 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.
3.3 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.
3.4 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.
3.5 Operating load curve
The load trend curve function is mainly responsible for timing the 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 condition 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.
3.6 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.
3.7 Data Forwarding Function
The power management system forwards the data to the SQL Server database of the control center through the intra-plant LAN to realize data sharing and avoid repeated data collection.
4 Case analysis
Ankerui Electric Co., Ltd. selects the PZ80L-E4 multi-function network power meter for its use.
The size and detailed parameters of PZ80L-E4 are shown in Figure 2 below:
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Figure 2 PZ80L-E4 size
The system monitors the communication status of all points on the site, and the red and green colors respectively indicate that the instrument communication is abnormal and normal, which is convenient for the user to check the communication status of each monitoring point, as shown in Figure 3:
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Figure (3) Communication status diagram
The telemetry alarm function mainly completes the specific alarm position and audible alarm for the direct change and main transformer load over-ejecting alarm interface, and reminds the on-duty personnel to deal with it in time. The load limit is freely set under the corresponding authority. With historical query function, see Figure (4).
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Figure (4) Over-limit alarm information
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. The user can directly print the report and export it to the EXCEL format as shown in Figure (5):
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Figure (5) Energy report
Parameter meter reading function, mainly the electrical parameters of all loops are entered into the line. Supports electrical parameter query at any time, with functions such as data export and report printing. The electrical parameters mainly include: three-phase voltage, three-phase current, active power, reactive power, frequency and active power. As shown in Figure 6.
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Figure (6) Parameter reading
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 (7).
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Figure (7) Current trend graph
The system can set different permission groups for different levels of users, to prevent losses caused by human error in production and life, and to 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.
4 Conclusion
1) The system completed on-site commissioning in September 2013, successfully passed the user acceptance and put into operation, the system is stable and reliable, and no fault has occurred so far, which has been well received by users.
2) The successful implementation of this project shows that the technical solution of this project is scientific, reasonable and feasible.
3) The system adopts centralized monitoring of distributed power distribution and achieves the expected effect. The power management software operation interface meets the user requirements and effectively reduces the design and construction costs.
About the Author:
Yang Junjun, female, Han nationality, undergraduate, engineer, the main research direction is intelligent building power supply and distribution monitoring system. Contact phone, mobile phone, QQ
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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