Ankerui Qingqing
Jiangsu Ankerui Electric Appliance Manufacturing Co., Ltd. Jiangyin, Jiangsu 214405
Abstract: Based on the current rapid development of science and technology, people rely more and more on power resources. At this stage, the operating costs of domestic power systems are relatively high. Therefore, it is imperative to improve the work of all aspects of the power system. The power management system plays an important role in the entire power system. It can effectively promote the efficiency of grid management and reduce the operating costs of the power system. This article describes the application of the energy management system of the Kunming No. 9 WWTP. The power management system is in the factory. Applications.
Key words: power system; data acquisition; sewage treatment plant; monitoring 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.
With the continuous development of the electric power network and the continuous increase in the power load, various new types of loads have emerged. Users are paying more attention to the issue of power quality. At the same time, they also put forward more stringent requirements for power quality. Users need more effective power management and management solutions to meet the challenges brought about by these changes, in order to achieve a continuous, reliable, efficient and low-cost operation of the power distribution system. This article describes the application of the power management system in the factory through the construction of Kunming No. 9 Wastewater Treatment Plant's power management.
1 Project Overview and Construction Objectives
90% of the 9 sewage works are all buried in the ground. They are also called "groundwater sewage treatment plants." Only a comprehensive office building is built on the ground. Sewage treatment plants in developed countries are generally built underground, and underground sewage treatment plants are suitable for construction in areas with high land resources and high environmental requirements. In foreign countries, underground sewage treatment plants are technically mature and widely used. Modern, closed, compact, zero-pollution, and wastewater treatment plants coordinated with the surrounding environment can prevent the depreciation of surrounding land. The treatment process of the sewage plant adopts the world's most advanced membrane bioreactor (MBR) sewage treatment process, which uses a full-buried arrangement to save land and minimize the impact on the surrounding environment. In this project, there are 12 ACR220ELH smart meters and 61 ACR220EL electric meters connected to the background monitoring system.
In this power management system, the monitoring requirements mainly include the following aspects:
1. Remote observation. The system is required to accurately detect current, voltage, active power, reactive power, active power, reactive power, apparent power, power factor, frequency, switching status, and residual current.
2. Remote communications. The system is required to deliver the operational status of the equipment and fault information in a timely manner.
3. Alarm. The system is required to set alarms for various kinds of information.
4. Display. The system is required to be able to display the operational information of each part on the spot.
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 the real-time monitoring of the low-voltage distribution circuit in the plant, which is beneficial to the management of power. On the other hand, the energy management system can not only accurately show the power status of the loop, but 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 factory. When the load of the power system in the plant exceeds the standard, the power management system can quickly alarm and issue voice prompts. 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 plant and makes the power activities in the plant more secure, thus ensuring the safety of life of the people in the factory and improving the enterprise. Personnel work efficiency.
2.1 System Structure
According to the distribution situation of newly-built factories, the online monitoring system construction adopts a hierarchical distributed structure. The system includes: station management layer, network communication layer, and field device layer. The system network structure is shown in Figure 1:
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 NPORT5610-16 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 power distribution system. ACR220ELH, ACR220EL energy meter is configured on site to realize the protection of each high-voltage loop, three-phase current, three-phase voltage, frequency, power and four-quadrant electrical energy. The three-phase current, three-phase voltage and frequency of the low-voltage loop are monitored. , power, four-quadrant electrical energy and other electrical parameter monitoring; and the monitoring of each circuit breaker switching status.
2.2 Network Design The network system in the power management system can transmit data in time and quickly transfer operation instructions, which is the basis for realizing various functions of the power management system. Connect each device on the spot with the bus in the scene, and then connect all 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 telemetering 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 Data Acquisition and Processing
Data acquisition mainly includes analog and digital acquisition. The acquisition of analog quantity mainly collects the information of line voltage, current, power, power factor, frequency, etc., and realizes the 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 requirements of automation and intelligence of the power distribution monitoring, and store the collected data in the database for user query.
2.3.2 Data Record
The data recording function of the power management system is mainly to record the sequence of the circuit breakers and the sequence of the protection operations. It 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 data such as real-time current and real-time voltage when the fault occurs. It can be seen that the data recording function can accurately reflect the problems existing in the system through the recording of the working status of the protection device and the recording of the fault information, thereby facilitating the solution of the staff.
2.3.3 Power Management
In order to realize the supervision of the power consumption of each circuit in the factory, the system has designed the power management report. The system automatically generates daily, monthly and annual reports and prints the report by collecting the active power , according to the name of the circuit . , It can also inquire about the power consumption in a certain period of time of a certain loop, and can help the property to establish an effective energy management assessment system. Through the construction of the system and the establishment of the system, the energy-saving awareness of all registered management personnel has been greatly improved, and energy consumption has been effectively saved.
3, the significance of application of power management system in power supply and distribution design
In summary, the power management system helps power units to improve efficiency, reduce losses, and reduce operating costs. The power management system can effectively ensure the efficiency of power grid management and reduce the cost of power operations. It has also become an indispensable part of modern power supply and distribution design. component. The system passes the power, electricity and power quality signals of the distribution network collected by the main power points in the enterprise power grid and the power monitoring devices in the power distribution cabinet, and then converts the signals into data for transmission to the computer. The computer stores the data. , calculation and classification are stored in the database, and then the electrical energy is displayed in the form of a chart through the calculation software. Power management personnel can see the entire process of inputting, transmitting and consuming power through the computer. Since monitoring equipment transmits data through network transmission, different power management systems can design different networking methods to ensure that data information can be transmitted quickly and accurately. On the other hand, in the power supply and distribution design using the power management system, monitoring equipment should be selected based on the actual situation. The general electric energy management system usually adopts the equipment with the function of long-distance communication, long-distance observation,etc., and some high-end electric energy management systems need to choose the more complete and more intelligent equipment. Can identify other influencing factors (such as higher harmonics, three-phase asymmetry, transients, short-term interruption, over-current, over-voltage, etc.) to extend equipment life.
The installation of energy management systems in factory buildings and other places can realize the real-time monitoring of the low-voltage power distribution circuits in the plant, which is conducive to energy management. The system can carry out electric energy audit and assessment according to the needs of the users according to shifts, personnel, time and equipment. The system calculates the power consumption of each workshop, shifts, personnel, and equipment in real time, accurately and flexibly, and combines it with the assessment mechanism of the company to automatically calculate the assessment results. On the other hand, the energy management system can not only accurately show the power status of the loop, but 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 factory. When the load of the power system in the plant exceeds the standard, the power management system can quickly alarm and issue voice prompts. 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 plant so that the power activities in the plant are safer and more reasonable, thus ensuring the safety of life of the people in the factory. Improve work efficiency of staff.
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