Summary:In this paper, the classification and main functions of the intelligent energy metering management system are introduced, and the electrical design of the system is expounded through engineering examples.
Keywords:intelligent energy metering; Key features; Project examples.
0 Introduction. As the main place to inherit the achievements of human civilization, its social status is self-evident. School electricity is an important part of many electricity units, how to rationally use and manage the school's power resources and meet the students' electricity requirements, improve the quality of life of students is a very worthy research topic. The intelligent electric energy metering management system came into being to solve these problems.
1. Classification of smart metering systems.
The intelligent electric energy metering management system is mainly divided into intelligent centralized electric energy metering system and intelligent distributed electric energy metering system, of which the intelligent centralized electric energy metering system includes single-phase intelligent centralized electric energy metering system and three-phase intelligent centralized electric energy metering system; It integrates many functions such as electric energy metering, time period control, load control, and real-time monitoring, which is not only convenient for management, but also effectively prevents the occurrence of all kinds of leakage and overload electricity. Most schools use intelligent centralized electric energy metering systems (hereinafter referred to as smart metering systems), which are also described in this article.
2. The main functions and characteristics of the smart metering system.
1) The intelligent metering system is composed of system software, network, data manager, metering control module and motor control cabinet. The system adopts multi-threaded distribution technology, supports a variety of connection modes, and uses RS485 private network communication or TCP IP protocol to use campus communication, without the use of IC card for data transmission. There are two types of control cabinets: centralized cabinets and hierarchical embedded cabinets, each centralized cabinet can manage up to 112 rooms, and the layered embedded cabinet can manage up to 32 rooms.
2) The intelligent metering system can mainly realize the following functions: unit electricity metering and billing, residual electricity low limit alarm prompt, pre-purchased electricity, no fee shutdown, real-time monitoring, short circuit protection, timing power control, unit current limit setting, unit electricity inquiry, automatic fault alarm, free basic electricity setting, refund management, user switching and locking, power failure data protection, electricity consumption data statistical analysis, etc.
3. Management mode.
The management mode of the smart metering system is divided into stand-alone version and network final version.
1) The stand-alone version adopts a single management mode, and a series of management such as electricity sales, inquiry, and monitoring are carried out in the rooms under its jurisdiction through the installation of the power control platform on the computer.
2) The network version adopts a composite management mode, through the local area network, the functions of the power control system are separated, and the management is supervised by each other, as detailed in the following block diagram
4Acrelems-EDU comprehensive energy efficiency management platform for universities.
4.1 Platform Overview.
Acrelems-EDU Campus Comprehensive Energy Efficiency Management Solution provides an information management platform for colleges and universities for campus energy statistics, logistics billing management, campus operation and maintenance management, etc. From the perspectives of "source, network, load, storage and charging", the current and future energy consumption problems and energy demand of colleges and universities are analyzed, and the management mode of "energy complementarity and information exchange" is realized under the unified demand. Help school management to be intelligent, digital, and integrated, and realize energy-saving campuses, green campuses, and low-carbon campuses.
4.2 platform composition.
The Acrelems-EDU comprehensive energy efficiency management platform adopts an open hierarchical distributed network structure, which is mainly composed of equipment layer, transmission layer, data layer and application layer. The platform integrates functions such as power monitoring, power statistics, electrical safety, power quality analysis and governance, intelligent lighting control, prepayment, etc., and users can obtain data through browsers and mobile apps, and can carry out centralized monitoring, unified scheduling, and unified operation and maintenance of enterprise electricity consumption globally and as a whole through a platform, while meeting the requirements of reliable, safe, economical, efficient and orderly electricity consumption of enterprises.
4.3. Platform architecture.
Figure 1: Architecture topology of Accuray's comprehensive energy efficiency management scheme for universities.
5.1. Campus power monitoring and operation and maintenance.
Integrate all equipment data, comprehensive analysis, collaborative control, optimized operation, centralized control, centralized monitoring, digital inspection, mobile operation and maintenance, team re-optimization and integration, and reduce manpower allocation.
5.2. Logistics billing management.
Adopt advanced network meter reading payment management technology to realize comprehensive billing of electricity, water, gas and other energy, realize remote meter reading, rate setting, bill statistics summary, etc., support WeChat, Alipay, Yi** and other recharge payment methods, and can set up subsidy schemes. Through the management of energy payment, cultivate the awareness of energy conservation of energy-using groups and departments.
5.2.1. Dormitory electricity management.
Management and control of electricity consumption in student dormitories: basic electricity quota and timing on/off function can be issued in batches;
It can identify vicious loads, detect illegal electrical, and obtain illegal electricity trip records;
5.2.2. Shop water and electricity charges.
Prepaid management for campus supermarkets, shops, canteens and other individual water and electricity consumption.
5.2.3. Charging pile management platform.
Charging piles are indispensable in the information energy structure of "source, network, load, storage and charging". The application management of charging piles is also an indispensable part of campus life services.
5.2.4. Intelligent lighting management.
Through the global monitoring of street lamps in colleges and universities, it provides flexible and intelligent management of street lights, realizes the timing switch, forced switch, brightness adjustment, and flexible setting of any line and any street lamp on campus, as well as the flexible setting of timing control scheme, so as to ensure the intelligent control and high efficiency and energy saving of street lighting.
5.3. Energy management system.
Statistical analysis is carried out on various types of connected energy sources such as water, electricity, and gas on campus, including year-on-year analysis, month-on-month analysis, and loss analysis. Understand the total amount of energy used and where the energy flows.
Various types of building power consumption data collected and counted according to the classification of campus buildings. For example, the power consumption of office buildings, teaching buildings, student dormitories, etc., the analysis of data categories provides leadership decision-making and improves management efficiency.
Build a database that meets the content and requirements of campus energy-saving supervision, automatically complete the collection of energy consumption data, automatically generate various forms of reports, charts and systematic energy consumption audit reports, monitor the operation status of energy-consuming equipment, set control strategies, and achieve the purpose of energy saving.
5.4. Intelligent fire protection system.
Based on modern information technologies such as the Internet of Things, big data, and cloud computing, the smart fire cloud platform connects scattered automatic fire alarm equipment, electrical fire monitoring equipment, smart smoke detectors, smart fire water and other equipment to form a network, and intelligently perceives, identifies and locates the status of these equipment, collects fire information in real time, and conducts data analysis, mining and trend analysis through the cloud platform to help achieve the goals of scientific early warning of fire, grid management, and implementation of multi-responsibility supervision. It realizes the unmanned on-duty smart fire protection, and realizes the "automation", "intelligence" and "systematization" needs of smart fire protection. From fire prevention, to fire alarm, to control linkage, operating in a unified system platform, users, security personnel, and supervision units can intuitively see the operation status of various fire-fighting equipment and sensors in each building through the platform, and can quickly notify the relevant personnel in the event of emergency and non-emergency situations such as hidden dangers and fires in a few seconds.
6. Platform deployment hardware selection.
6.1. Power monitoring and operation and maintenance platform.
6.2. Logistics billing management.
6.2.1 dormitory commercial prepaid platform.
6.2.2. Charging pile management platform.
6.2.3. Intelligent lighting management.
6.3. Energy management system.
6.4. Intelligent fire protection system.
6.4.1. Electrical fire monitoring system.
6.4.2. Power monitoring system for fire-fighting equipment.
6.4.3. Fire door monitoring system.
6.4.4. Fire emergency lighting and evacuation indication system.
7 Concluding remarks. Compared with the ordinary meter metering system, although the equipment investment will be larger, the intelligent metering system can achieve centralized management and centralized control, eliminating the cumbersome on-site meter reading of the personnel on duty, simplifying the management process, saving manpower management resources to the greatest extent, and reducing power loss, which is a sustainable development measurement method. Therefore, it is worthy of extensive use in schools or other public buildings.