Jiangsu Ankerui Electric Appliance Manufacturing Co., Ltd. Jiangyin , Jiangsu 214405
Abstract: The Ankerui power management system was introduced. The smart power meter was used to collect various electrical parameters of the power room and the power distribution field of the production workshop. The system adopts the on-site local networking method. After the networking, it is transmitted remotely to the monitoring background through fieldbus communication. The power management system is used to realize real-time monitoring and management of power distribution circuit substations.
Keywords: substation; intelligent power meter; power management system;
0 Overview Â
Since its inception in 2002, Zibo Lurui Fine Chemical Co., Ltd. has devoted itself 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.
This project has a total of two power distribution cabinets in the power room and production workshop. A total of 30 0.4 KV loops need to be monitored.
1 customer needs
Due to the fact that distribution cabinets on site are distributed in two workshops, it brings inconvenience to the power management personnel. According to their actual situation, the following requirements are proposed:
1. The main purpose of this design and integration is to centralize the management of distributed power distribution and achieve data sharing.
2. When the current of each loop exceeds the limit, it cannot be known in real time by the management personnel. There is a hidden danger in the safe use of electricity, and the system must be able to realize the sound and light alarm function.
3. Real-time monitoring of the real-time current, voltage and power fluctuations of the main transformer and the linear transformer.
4, can check the specific electricity consumption of a certain circuit or several circuits every day, and can be compared through the report.
According to the needs of users, it is necessary to network the production workshop and the power distribution room to establish the power management system (mainly real-time data monitoring), set up a monitoring platform in the control center duty room, real-time monitoring and statistics of 30 0.4KV loops. , analysis to ensure the safety, reliability and efficiency of electricity use.
Ancorui's power management system makes full use of the latest developments in modern electronic technology, computer technology, network technology and fieldbus technology, and conducts distributed data collection and centralized monitoring and management of the power distribution system. The secondary equipment of the distribution system is networked. Through the computer and the communication network, the field devices of the decentralized power distribution station are connected into an organic whole, and remote monitoring and centralized management of the power grid operation are realized.
2 System Structure Description
The system adopts a hierarchical distributed structure for design, namely, station management layer, network communication layer and field device layer. The network diagram of the project group is as follows. The PZ80L-E4 network power meter at the site 2 sites is connected to the serial server through the RS485 field bus. Then it is transmitted to the on-site monitoring host via Ethernet to achieve data collection, storage, processing, display and upload as shown in Figure (1):
Figure (1) Network topology of power management system
Interval equipment layer is mainly: PZ80L-E4 multi-function network power meter, corresponding to the corresponding primary equipment dispersedly installed in the power distribution cabinet of 2 workshops, these devices are all using RS485 communication interface, through the on-site MODBUS bus network communication, to achieve Data collection at the scene.
The main network communication layer is: a communication server. The main function of the communication server is to collect the scattered data at the site collection device, and transmit it to the station control layer at the same time, to complete the data exchange 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 operating status of the field equipment and display it to the user in the form of human-computer interaction.
After the completion of the construction of multi-function network power meters are used RS485 interface and MODBUS-RTU communication protocol, RS485 transmission using shielded lines , generally use two connections, the wiring is simple and convenient; communication interface is half duplex communication that both sides of the communication Can receive and send data but can only send or receive data at the same time , the maximum data transfer rate is 10Mbps .
RS48 5 interface is a balanced differential driver and receiver combination, enhanced noise immunity, allows up to 32 devices on the bus, the maximum transmission distance of 1.2km.
3 main functions of the power management system
3.1 Data Acquisition and Processing
Data acquisition is the basis of power management. Data acquisition is mainly completed by the underlying multi-function network instrumentation to achieve 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†, power Epi, and remote device operating status.
Data processing is mainly to display the electrical parameters collected according to requirements in real time and accurately to the user, to achieve the automation and intelligent requirements of the power management, and at the same time store the collected data into the database for user query.
3.2 Historical events
The historical event viewing interface provides convenient and friendly human-computer interaction for the user to view fault records, signal records, operation records, and over-limit records. Once you have viewed the platform through historical events, you can easily locate the user based on your own requirements and query conditions. The historical events that you want to view provide you with good software support for the overall system operation.
3.3 Database Establishment and Query
It mainly completes remote measurement and remote signal acquisition, and establishes a database to generate reports regularly for users to query and print.
3.4 User Rights Management
For different levels of users, different permission groups are set to prevent the losses caused by human misoperation to production and life, and to realize the safe and reliable operation of the distribution system. You can use user management to perform user login, user logout, password change, and add/delete operations to facilitate the user's modification of accounts and permissions.
3.5 Running load curve
Load trend curve function is mainly responsible for the timing of important loop current and power load parameters, automatic generation of operating load trend curve, to facilitate users to understand the equipment operating load status. Click the corresponding button or menu item of the screen to complete the switching of the corresponding function; 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 the user to enter the line trend.
Potential analysis and fault recall provide intuitive and convenient software support for analyzing the operating status of the entire system .
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 the data processed in the system is filtered, combined and statistically generated to generate the report data required by the user. This program can also be based on the needs of users of the report file to save, print or summon save, print mode. At the same time, this program also provides users with management functions for generated report files.
The report has the functions of freely setting the query time to realize daily, monthly, and annual energy statistics, data export, and report printing.
3.7 Data Forwarding Function
The power management system forwards data to the SQL Server database of the control center through the factory LAN to share data and avoid duplicate data collection.
4 Case Studies
Ankerui Electric Co., Ltd. uses its PZ80L-E4 multi-function network power meter.
The PZ80L-E4 size and detailed parameters are shown in Figure 2 below:
Figure 2 PZ80L-E4 size
The system monitors the communication status of all points on the site. The red and green colors indicate that the instrument communication is abnormal and normal. It is convenient for users to check the communication status of each monitoring point, as shown in Figure 3:
Figure (3) Communication State Diagram
The telemetry alarm function is mainly used to indicate the specific alarm position and audible alarm for the straightforward change and main change load over-limit pop-up alarm interface to remind the on-duty personnel to deal with it in time. The load limit can be set freely under the corresponding authority. With historical query function, see Figure (4).
Figure (4) Limit Alarm Information
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, allowing users to modify the loop names. Users can directly print the reports and export them to the EXCEL format as shown in figure (5):
Figure (5) Energy Report
Parameter meter reading function, all the main electrical parameters into the line loop query. 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.
Figure (6) Parameter meter reading
The load trend curve interface allows you to visually check the load operation of the loop. View real-time and historical trend curves, click the corresponding button or menu item to complete the switching of corresponding functions; help the user to enter the trend analysis and fault recall, with curve printing function. Provides intuitive and convenient software support for analyzing the entire system's operating conditions , see Figure (7).
Graph (7) current trend graph
The system can set different permission groups for users of different levels to prevent the loss caused by human misoperation to production and life, and realize the safe and reliable operation of the distribution system. You can use user management to perform user login, user logout, password change, and add/delete operations to facilitate the user's modification of accounts and permissions.
1) The system was commissioned on-site in September 2013. It passed the user acceptance and was put into operation. The system is stable and reliable. No failures have occurred so far and it has been well received by users.
2) The successful implementation of this project shows that: The project's technical plan is scientific, reasonable and feasible.
3) The system adopts centralized monitoring of distributed power distribution and achieves expected results. The interface of power management software meets the needs of users and effectively reduces design and construction costs.
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