Abstract: With the continuous deepening of enterprise reform, the modernization level of power supply management is increasingly demanding, and it can quickly and accurately obtain the power data of each power link, electricity consumption analysis, load management, operation monitoring, and electricity charges. Automatic settlement, a powerful tool to improve the economic efficiency of enterprises. In order to improve the monitoring system, technical personnel have gradually increased their research work on the monitoring system in recent years, and they have begun to use new technologies to reconstruct the existing monitoring system, which has provided great help for the optimization of monitoring systems in various departments. . This article describes the application of the power management system in enterprise power management through the application of substations in Akzo Nobel Taikoo Paint (Shanghai) Co., Ltd. project.
Keywords: power management system; monitoring system; centralized meter reading system; power management system;
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 the enterprise through the construction of the power management system for Akzo Nobel Taikoo Paint (Shanghai) Co., Ltd. project.
1 Project Overview and Construction Objectives
Akzo Nobel Taiko Oil (Shanghai) Co., Ltd. was registered and established on December 20, 1995 at the Shanghai Municipal Administration of Industry and Commerce. The legal representative Han Hua, the company's business scope includes production, research and development of water-based paint products (except dangerous chemicals). AkzoNobel Taikoo Paint (Shanghai) Co., Ltd. is currently upgrading the low-voltage power distribution system 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 energy management system of this project can realize real-time monitoring of the high-level and distribution circuit in the station 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 AkzoNobel Taikoo Paint (Shanghai) Co., Ltd., the distribution of the online monitoring system adopts a hierarchical distributed structure. The system includes: station management layer, network communication layer, and field device layer. The network structure of the system is shown in the figure:
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 the N1S04-485I-ETS serial port 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 various types of instruments used for the collection and measurement of electrical parameters in the network, and it is also a necessary basic element for constructing the distribution system. 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 on-site with the bus in the field, and then connect all the buses to the communication gateway 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; electric parameter remote measurement and electric parameter crossing limit alarm; event recording; system operation abnormality monitoring; fault alarm and operation record; report query and printing; 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 distribution lines in the form of a trunk diagram of the power distribution, at the same time the information of the electrical parameters of each loop collected in real time, and the switching status of the switch of the distribution circuit. , Real-time display in the system interface. As shown below:
2.3.2 Data Acquisition and Processing
Data acquisition mainly includes analog and digital acquisition. The acquisition of analog quantity mainly includes the collection of information on line voltage, current, power, power factor, frequency, and power. The collection of the switch quantity is mainly for the working status of circuit breakers and other equipment, as well as the power-off protection and operation failure alarms. Information is collected to achieve local real-time display of remote data. 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 automation requirements of the power distribution monitoring, and store the collected data in the database for the user to query. (The power management system displays the three-phase current and apparent power of the incoming cabinet in real time)
2.3.2 Data Report Statistics
The energy 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.
2.3.3 Alarm Information Setting and Query
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.
2.3.4 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. Timely staff members are not on site, but they can also send text messages to the on-duty staff to obtain timely information. According to the actual use of the equipment reflected by the system, it is convenient for the staff to properly arrange the relevant maintenance work.
references
[1] "Principles and Application Guide for Power Electronic Measurement Digital Meters", Ren Chengcheng, Zhou Zhong, China Electric Power Press
[2] "Application of Power Monitoring System in Power Supply and Distribution Design", Gao Shihong, Science and Technology
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