Ankerui Zhang Qifeng
Jiangsu Ankerui Electric Manufacturing Co., Ltd.
Abstract: With the continuous deepening of enterprise reform, the modernization level of power management is getting higher and higher, and the energy data of each power consumption link can be obtained quickly and accurately. Power consumption analysis, load management, operation status monitoring, and electricity tariff Automatic settlement, a powerful means to improve the economic efficiency of enterprises. In order to improve the monitoring system, in recent years, the technical staff has gradually increased the research work on the monitoring system, and began to use the new technology to transform the existing monitoring system, which has greatly helped the construction of the current monitoring system. . This paper introduces the application of power management system in enterprise power management through the application of substation and floor in Shanghai Leiyunshang Pharmaceutical Co., Ltd. project.
Keywords: power management system; monitoring system; centralized meter reading system; power management system;
0 Preface
Distribution automation is a comprehensive information management system integrating computer technology, data transmission technology, control technology, modern equipment and management. Its purpose is to improve power supply reliability, improve power quality, provide quality services to users, reduce operating costs, and reduce the labor intensity of operators.
The enterprise power management system is a product of responding to the national energy conservation and fine energy management call, aiming at improving the terminal power efficiency and changing the power consumption mode. While meeting the same power consumption function, the power consumption and equipment danger warning and reduction are realized. Electricity consumption and power demand, to achieve safe use of electricity, save resources and protect the environment, to achieve the "safe use of electricity, economic electricity, orderly electricity, smart electricity" power targets. This paper introduces the application of power management system in industrial enterprises through the construction of the power management system of (Kunshan) Perlman Electromechanical Co., Ltd. project.
1 Project overview and construction goals
With the advent of the information age, more and more devices are required to provide uninterrupted power supply, and higher requirements are imposed on power supply. Power outages or power cuts can result in reduced production, and sudden power outages can jeopardize critical equipment in the plant. The backward manual power distribution method is not applicable to modern manufacturing. Only by realizing distribution automation, it is possible to improve the quality of power supply to meet the needs of people's daily work and production. Achieving automation of the substation can improve the reliability of the power supply. Realizing substation automation can reduce the number of failures, narrow the scope of accidents, shorten the accident time, and provide an effective basis for restoring power supply, quickly analyzing, diagnosing, and reporting the cause of the accident.
Shanghai Leiyunshang Pharmaceutical Co., Ltd. is now upgrading its low-voltage power distribution in response to the national energy conservation and emission reduction policy. In order to ensure the reliability of the facility for power distribution, the power management system is configured to monitor and save data in real time for later management.
2 Design of power management system
In the design of the monitoring system, it is necessary to fully consider the actual needs of the customer, as well as the actual structure of the power system, the actual load capacity of the power system, etc., and then rationally select the monitoring equipment, which is beneficial to reduce the cost of the system operation, and also Conducive to the realization of system functions. The power management system of the project can realize real-time monitoring of the low-voltage distribution circuit of the substation, which is beneficial to power management. On the other hand, the power management system can not only accurately indicate the power consumption status of the circuit, but also has the functions of network communication, etc., and can be combined with computers, serial servers and other devices to display the operation status of each power distribution circuit in the station in time. 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 power management system can also generate statistical information such as reports and graphs, so that the relevant personnel can analyze the power consumption status of various parts in the station, so that the power usage activities in the station are safer, thus ensuring the life safety of the station personnel and improving the station staff. Work efficiency. 2.1 System structure According to the distribution of power distribution of Shanghai Leiyunshang Pharmaceutical Co., Ltd., the online monitoring system construction adopts a layered and distributed structure. The system includes: station control management layer, network communication layer and field equipment layer. The system network structure is as shown:
The station controls the management personnel to directly interact with the computer for human-computer interaction, calculate, analyze and process all kinds of data information on the collected site, and reflect the operation status of the site in the form of graphics, digital display, sound, etc. Upper part. Mainly consists of system software and necessary hardware equipment, such as industrial grade computers, printers, UPS power supplies and so on.
The device used by the communication layer is a serial server. This layer is a bridge for data information exchange. It is responsible for collecting, classifying and transmitting the data information returned by the field devices, and at the same time relaying various control commands of the host computer to the field devices.
The field device layer is mainly connected to various types of Ankerui DTSD1352-C and PZ80L-E4/C instruments for electrical parameter acquisition and measurement in the network. The SB-2100 flowmeter is also the essential basic component for constructing the power distribution system. element. The field is equipped with a positive electric energy meter to realize three-phase current, three-phase voltage, frequency, power, four-quadrant electric energy and other electrical parameter monitoring of the low-voltage circuit; and monitoring the closing state of each circuit breaker.
2.2 Network Design The network system in the power management system can transmit data in time and quickly transmit operational commands, which is the basis for realizing the functions of the power monitoring system. Each device on the site is connected to the bus in situ, and then all the buses are connected to the serial server to realize the transmission 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 plant area energy ratio pie chart; electrical parameter telemetry and electrical parameter over-limit alarm; event record; system operation abnormal monitoring; fault alarm and operation record; Query and print; system load real-time, historical curve, user rights management and other major functions.
2.3.1 Distribution diagram display
The power management system has a friendly human-machine interface, which can visually display the distribution of distribution lines in the form of a power distribution primary trunk diagram and the data acquisition frequency is 1S. At the same time, the electrical parameters of each loop collected in real time, and the distribution loop The switching status 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 the system in real time 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 power management system reflects the integrity of the measurement system with rich data reports. The system has the function of counting and counting the periodic meter reading of each loop. The user can freely query the power usage of each power distribution node in any time period since the normal operation of the system, that is, the statistical analysis of the power consumption of the incoming line of the node and the power consumption of each branch circuit. Report. This function makes the electricity use visible and transparent, and can be traced when the power consumption error is too large to maintain the correctness of the measurement system.
2.3.4 Current curve query
The management system has designed a load trend curve for the distribution line of the distribution system and the exit line of important loads. It is convenient for distribution and maintenance personnel to keep abreast of the demand of power consumption and the load of power supply system to ensure the reliability of power supply and provide guarantee for the energy use rights of user units. With this function, it is also possible to analyze the growth trend of energy demand, adjust the demand declaration in a timely manner, and reduce the excess payment due to excessive deviation of demand. Secondly, the data recording function of the power management system also includes the recording of fault information, that is, recording and storing data such as real-time current and real-time voltage when the fault occurs. The power management system can monitor the voltage, current and power through the management personnel, so as to monitor the power distribution situation in real time, whether there is a short circuit or overload, etc., which is convenient for the staff to solve. The details are as follows:
2.3.5 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 to record and store data information for a long time. Secondly, the data recording function of the power management system also includes the recording of fault information, that is, recording and storing data such as real-time current and real-time voltage when the fault occurs. The power management system can monitor the voltage, current and power through the management personnel, so as to monitor the power distribution situation in real time, whether there is a short circuit or overload, etc., which is convenient for the staff to solve. The details are as follows:
2.3.6 User Rights Management
Power Management System For the safe and stable operation of the project system, user rights management can prevent unauthorized operations (such as power distribution loop name modification). You can define login names, passwords, and operation rights for users of different levels, and provide reliable security for system operation and maintenance management.
3 Significance of applying power monitoring system in power supply and distribution design
In summary, in response to the above problems, and according to customer requirements, the original power distribution system is transformed, and the modified power management system can not only realize remote monitoring and centralized management of each power distribution circuit, but also realize The monitoring equipment performs classification energy statistics. Through the setting of the power management system, the staff can make correct judgments and input operations in a short time. With a comprehensive understanding of the state of the grid, staff can handle faults in a timely and accurate manner. In addition, he has more important social benefits. Reducing the working hours of human beings in strong electric fields is of great significance to the health of employees, and can avoid many occupational diseases and human-induced electric shocks.
references
[1] "Guidelines and Application Guidelines for Digital Measurement of Electric Power Measurement", Ren Zhicheng, Zhou Zhong, China Electric Power Press
[2] "Application of Power Management System in Power Supply and Distribution Design", Gao Shihong, Technology Wind
[3] DL/T448-2000 "Technical Management Regulations for Electric Energy Metering Devices [S]
[4]. "Communication Technology in Power Centralized Meter Reading System" [J]. Power System Communication, Xu Pingping, Qiu Yuchun
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