0 Overview
The 10KV substation project of Kunshan Chimei Material Technology Co., Ltd. will build 6 factories and 12 production lines with annual sales of about 15 billion yuan. Among them, the first phase of investment of 300 million US dollars, plans to build a factory, two production lines, with an annual output of 12 million square meters of polaroids, annual output value of 2 billion.
This project is a 10KV substation power management system of Kunshan Chimei Material Technology Co., Ltd. According to the requirements of power distribution system management, power management must be performed on the low-voltage distribution outlet loops within the two substations in Kunshan Chimei Material Science and Technology Co., Ltd. to ensure the safety, reliability, and efficiency of electricity usage.
Acrel-3000 low-voltage intelligent power distribution system makes full use of the latest developments in modern electronic technology, computer technology, network technology and field bus technology, and performs 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 the remote monitoring and centralized management of the power grid operation is realized.
1 System Structure Description
The monitoring system mainly implements the power monitoring and power management of the 0.4kV power distribution system of two substations of Kunming Chimei Material Technology Co., Ltd., and monitors 14 ranges of PZ96L-E4/KC and 98 sets of PZ72L in the FAB1 substation. -E4/KC, 7 sets of PZ96L-E4/KC in CUB1 substation, 41 sets of PZ72L-E4/KC, and FAB1 substation in 5 substations that are connected directly to the duty room collector to access substation power management system , CUB1 substation is divided into two sub-bus collection box to the substation, and then through the optical network access to the duty room monitoring host, in order to achieve the bus on the meter and monitoring host data connectivity.
The monitoring system adopts a hierarchical distributed structure, namely station control layer, communication layer and bay layer;
As shown in Figure 1:
Figure (1) Network topology
Interval device layer is mainly: multi-function network power meter. These devices are corresponding to the corresponding primary equipment installed in the electrical cabinet, these devices are used RS485 communication interface, through the on-site MODBUS bus network communication, data acquisition on the spot.
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.
The above network instruments all adopt RS485 interface and MODBUS-RTU communication protocol. RS485 adopts shielded wire transmission. Generally, two wires are used to connect the wires. The connection is simple and convenient. The communication interface is half-duplex communication, that is, both parties can receive and send data. Only data can be sent or received at the same time. The maximum data transmission rate is 10Mbps. The RS485 interface is a combination of balanced drivers and differential receivers. It has enhanced noise immunity and allows up to 32 devices to be connected on the bus. The maximum transmission distance is 1.2 km.
2 main functions of the power management system
2.1 Data Acquisition and Processing
Data acquisition is the basis of power distribution monitoring. Data collection is mainly accomplished by the underlying multi-function network instrumentation, 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, power Epi, and remote device operating status.
The data processing mainly displays the electrical parameters collected according to requirements in real time and accurately to the user, so as to meet the requirements of automation and intelligence of the power distribution monitoring, and store the collected data in the database for user query.
2.2 Human-computer interaction
The system provides simple, easy to use, and good user interface. Using the Chinese interface, the CAD graphic shows the electrical main wiring diagram of the low voltage distribution system, shows the status of the distribution system equipment and the corresponding real-time operating parameters, the screen timing switching tour; dynamic refresh of the screen real-time; analog display; switch display; continuous Record display and so on.
2.3 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 that have occurred. You can view the platform through historical events. You can easily locate your own according to your requirements and query conditions. The historical events that you want to view provide you with good software support for the overall system operation.
2.4 Database Establishment and Query
It mainly completes the remote measurement and remote signal acquisition, and establishes a database to generate reports regularly for users to query and print.
2.5 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 user modification of accounts and permissions.
2.6 Running load curve
The load trend curve function is mainly responsible for regularly collecting incoming lines and important loop current and power load parameters, and automatically generating running load trend curves to facilitate users to know the operating load status of the equipment in a timely manner. 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 trend analysis and fault recall. Analyzing the entire system's operating status 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 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 Case Studies
Kunshan Zhimei Material Technology Co., Ltd. 10KV substation power management system is divided into two substations (FAB1 substation and CUB1 substation), this project is for the power management of the 0.4kV distribution system of the two substations. According to the monitoring of these two substations, the operation and management of the substations was completed, and the whole plant was fully controlled in terms of energy consumption.
The PZ96L-E4/KC multi-function instrument is used in the circuit of the power distribution station. It is a network power meter designed for the power monitoring needs of power systems, industrial and mining enterprises, public facilities, and intelligent buildings. It can measure all conventional power parameters, such as : Three-phase voltage, current, active power, reactive power, power factor, frequency, active power, reactive power and other electrical parameters. In addition, this instrument has 2 optically isolated digital input contacts. These contacts can be used with intelligent circuit breakers to achieve remote signaling operation of the circuit breaker. The 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 outlet loop adopts PZ72L-E4/KC series network power meters. The meter mainly measures all conventional power parameters such as: three-phase voltage, current, active power, reactive power, power factor, frequency, active power, and reactive power. .
The secondary diagram of low-voltage power distribution is shown in figure (2). The main function of the power telemetry is to monitor the electrical parameters of the operating equipment, including: three-phase voltage, current, power, power factor, electrical energy, frequency and other electrical parameters and distribution loops. Three-phase current; remote signal function to display the operating status of field devices, mainly including: switching of the switch, closing operation status and communication failure alarm; when the circuit breaker is dislocated, it will send an alarm signal to remind the user to deal with the fault in time.
The remote signaling and telemetry alarm functions mainly complete the monitoring of the switching operation status and load incoming line of the low-voltage outlet loops, and indicate the specific alarm position and audible alarm to the switch displacement and 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 history query function. See Figure (3) and Figure (4).
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. The report queries the electrical parameters of the low-voltage loops for the six transformer substations of the two substations, mainly including: three-phase current, active power, active power, and transformer temperature. The names of the loops in this report are associated with the database to facilitate the user to modify the loop name. See Figure (5).
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 each distribution circuit in the substation can be directly printed by the user, and can be saved in another location in EXCEL format. See Figure (6).
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 communication failure. See Figure (7).
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 health of the entire system. See Figure (8).
4 Conclusion
With the development of society and the wide application of electricity, the power monitoring system has become an inevitable choice for large-scale multi-substation users, such as key construction projects, landmark buildings, and large-scale public facilities throughout the country. The Acrel-3000 energy management system introduced in this paper is introduced. The application of the 10KV substation in Kunshan Chimei Material Technology Co., Ltd. can realize real-time monitoring and power management of substation high and low voltage distribution circuits. It can not only show the power status of the circuit, but also has network communication functions. With serial server, computer and other components of the power monitoring system. The system analyzes and processes the collected data, displays the running status of each distribution circuit in the substation in real time, has a pop-up alarm dialog box and voice prompts for the closing and closing of the load, and generates various energy reports and analysis curves. Graphics, etc., to facilitate remote meter reading and analysis, research. The system is safe, reliable and stable. It provides real and reliable basis for users of substations to solve electricity problems and has achieved good social benefits.
About the author: He Meifang, female, Ankerui Electric Co., Ltd., the main research direction for the smart grid power distribution, Email: Contact: 021-69156950 QQConnecting Terminals,Micro Connecting Terminal,Aluminum Connecting Terminals,Connecting Copper Terminal
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