0 Preface
Distribution automation is an integrated information management system integrating computer technology, data transmission technology, control technology, modern equipment and management. Its purpose is to improve the reliability of power supply, improve the quality of power, provide users with quality services, reduce operating costs, and reduce the labor intensity of operating personnel.
The enterprise power management system is a product that responds to the national call for energy conservation and energy consumption and refined energy management. It aims to improve the terminal power consumption efficiency and change the way of using electricity. While satisfying the same power consumption function, it also realizes early warning and reduction of power and equipment risks. Electricity consumption and power demand, to achieve safe electricity, save resources and protect the environment, to achieve the "safety of electricity, economic electricity, orderly use of electricity, smart electricity," the electricity use of the goal. This article describes the application of the power management system in industrial enterprises through the construction of the (Kunshan) Perlman Electromechanical Co., Ltd. project power management system.
1 Project Overview and Construction Objectives
With the advent of the information age, more and more devices are required for uninterrupted power supply, and higher demands are placed on power supply. Power outages or power cuts can lead to production cuts, and sudden power outages can jeopardize the plant's critical equipment. The backward manual distribution method is not applicable to modern manufacturing. Only when the distribution automation is realized can it be possible to maximize the quality of power supply and meet people's daily work and production needs. Realizing the automation of the distribution station can improve the reliability of the power supply. Realizing the automation of distribution stations can reduce the number of failures, reduce the scope of accidents, shorten the time of accidents, and provide an effective basis for restoring power supply, rapid analysis, diagnosis, and reporting causes of accidents.
Shanghai Lei Yun Shang Pharmaceutical Co., Ltd. is now upgrading the low-voltage power distribution in response to the national energy-saving emission reduction policy. In order to ensure the reliable power supply and distribution of the facility, the power management system is configured to monitor and save the data in real time for later management.
2 Design of power management system
In the design of the monitoring system, we must fully consider the actual needs of customers, as well as the actual structure of the power system, the actual load capacity of the power system, and other factors, and then choose a reasonable monitoring equipment, which is not only conducive to reducing the cost of system operation, but also It is conducive to the realization of system functions.
The power management system of this project can realize real-time monitoring of substation low-voltage distribution circuits and is conducive to power management. On the other hand, the power management system can not only accurately show the power status of the loop, but it also has network communication and other functions. It can be combined with computers, serial servers and other devices to display the status of each distribution circuit in the station. When the load of the power system in the station exceeds the standard, the power monitoring system can quickly alarm and issue a voice prompt. In addition, the energy management system can also generate statistical information such as reports and graphs, which facilitates the analysis of power consumption in various parts of the station and makes the power activities in the station more secure, thereby ensuring the safety of personnel in the station and improving the staff of the station. Work efficiency.
2.1 System Structure
According to the distribution situation of Shanghai Lei Yun Shang Pharmaceutical Co., Ltd., the online monitoring system construction adopts a hierarchical distributed structure. The system includes: station management layer, network communication layer, and field device layer. System network structure as shown
The direct window of human-computer interaction between the management and management personnel of the management team and the computer calculates, analyzes, and processes various types of data collected on the site, and reflects the operating status of the site in terms of graphics, digital display, sound, etc. The upper part. Mainly by the system software and necessary hardware equipment, such as industrial-grade computers, printers, UPS power supply and other components.
The device used by the communication layer is a serial server. This layer is a bridge for data information exchange. It is responsible for the collection, classification, and transmission of data information sent back by field devices, and it also conveys various control commands from the upper computer to the field devices.
The field device layer is mainly connected to the network for the collection of electrical parameters for measurement of various types of Acrel DTSD1352-C, and PZ80L-E4/C meters, SB-2100 flow meter, is also a basic component to build the distribution system element. The on-site electric energy meter is configured to realize the monitoring of electric parameters such as three-phase current, three-phase voltage, frequency, power, and four-quadrant electric energy of the low-voltage loop; and the status of each breaker circuit breaker is monitored.
2.2 Network Design
The network system in the power management system can transmit data in time and transfer operation instructions quickly, which is the basis for realizing various functions of the power monitoring system. Connect each device in the field with the bus in the field, and then connect all buses to the serial port server to realize the transfer with the host.
2.3 monitoring system software function design
The system is designed according to the customer's actual needs, and realizes a main wiring diagram interface display and the factory area electric energy accounting ratio pie chart; the electric parameter telemetering and electric parameter crossing limit alarm; event record; system operation abnormality monitoring; fault alarm and operation record; report Query and print; system load real-time, history curve, user rights management and other main functions.
2.3.1 One-time display of power distribution
The power management system has a friendly man-machine interface, can visually display the distribution of the distribution line in the form of a trunk diagram of the power distribution, and the data collection frequency is 1S. At the same time, the electrical parameter information of each loop collected in real time, as well as the distribution circuit The closing and closing state of the switch is displayed in real time in the system interface. As shown below:
2.3.2 Flowmeter Operation Status Monitoring
The power management system provides flowmeter operating parameters, such as temperature, frequency, pressure, instantaneous flow, and cumulative flow, and can display whether the system is operating normally according to customer capacity requirements and display it in real time in the system interface. As shown below:
2.3.3 Data Report Statistics
The energy management system reflects the integrity of the metrology system with rich data reports. The system has the functions of periodical meter reading and statistics collection. Users can freely inquire about the power usage of each distribution node in any time period since the normal operation of the system, that is, the power consumption of the node's incoming line and the power consumption of each branch circuit. Report. This function makes electricity visible and transparent, and can trace back when the error of power consumption is too large, and maintain the correctness of the measurement system.
2.3.4 current curve query
The power management system designs a load trend curve for the outgoing line of the distribution system and the outgoing line of important loads. It is convenient for distribution maintenance personnel to grasp the power demand and the power system load share in time, ensure the reliability of power supply, and provide protection for users' rights and interests. With this function, it is also possible to analyze the growth trend of energy demand, timely adjust demand reports, and reduce unnecessary payment due to excessive demand deviation. Secondly, the data recording function of the power management system also includes the recording of fault information, that is, recording and storing the real-time current, real-time voltage and other data when the fault occurs. The power management system can manage the setting of voltage, current and power by the management personnel, thus real-time monitoring of the distribution situation, whether there is short circuit or overload, etc., which is convenient for the staff to solve. Specific as shown below:
2.3.5 Alarm Information Settings and Inquiry
The data recording function of the power management system requires that there must be enough memory space in the system, and then a long time and a large amount of data information is recorded and stored. Secondly, the data recording function of the power management system also includes the recording of fault information, that is, recording and storing the real-time current, real-time voltage and other data when the fault occurs. The power management system can manage the setting of voltage, current and power by the management personnel, thus real-time monitoring of the distribution situation, whether there is short circuit or overload, etc., which is convenient for the staff to solve. Specific as shown below:
2.3.6 User Rights Management
Power Management System For the project's safe and stable operation, user rights management can prevent unauthorized operations (such as the distribution circuit name changes). You can define login names, passwords, and operating rights for users at different levels, and ensure reliable security for system operation, maintenance, and management.
3 The significance of applying power monitoring system in power supply and distribution design
In summary, according to the above problems, and according to customer requirements, the existing power distribution system is reconstructed. After the transformation, the power management system can not only achieve remote monitoring and centralized management of each distribution circuit, but also realizes Monitoring equipment for classification of energy statistics. By setting the power management system, staff can make correct judgments and enter operations in a short period of time. With a full understanding of the status of the grid, the staff can handle the fault in a timely and accurate manner. In addition, he has more important social benefits. Reducing the working hours of humans in strong electric fields is of great importance to the health of employees and can avoid the occurrence of many occupational diseases and man-made electric shocks.
references
[1] "Principles and Application Guide for Power Electronic Measurement Digital Meters", Ren Chengcheng, Zhou Zhong, China Electric Power Press
[2] "Application of Power Management System in Power Supply and Distribution Design", Gao Shihong, Science and Technology
[3] DL/T448-2000 "Technical Regulations for Electric Energy Metering Devices [S]
[4]. "Communication technology in centralized power meter reading system" [J]. Power system communication, Xu Pingping, Qiu Yuchun
You Xiaoyun, female, undergraduate. Position: Current Position: Ankerui Electric Co., Ltd. Contact Phone, Mobile Phone, QQ
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