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Ankerui Electric Co., Ltd. Shanghai Jiading
0 Preface
With the development of society, the consumption of energy is also growing rapidly. In particular, the growth of building energy consumption is particularly rapid, and it has become the third largest energy consumption in addition to industry and transportation. According to the current development trend of the construction industry, the energy output of the society will not be able to meet the energy demand after a certain number of years, so reducing the energy consumption is a very important issue that needs to be solved as soon as possible. In the energy consumption of buildings, the energy consumption of large public buildings occupies a large share. Although the total energy consumption is far less than the consumption of residential buildings, the energy consumption per unit area is very large, so the large public buildings Energy saving work has great potential. The construction of large-scale public building energy consumption monitoring system enables people to fully understand the energy consumption of large public buildings, and lay the foundation for proposing effective energy-saving and emission reduction policies and decisions. With the advancement of China's urbanization process and economic development, China The total energy consumption of buildings has continued to grow, and the growth rate is getting faster and faster. If the building energy consumption is allowed to grow at this speed, it will inevitably bring great pressure on China's energy supply security. Therefore, building energy conservation is imperative.
Taking the People's Procuratorate of Yuecheng District of Shaoxing as an example, this paper introduces the application of online monitoring system of energy consumption in large-scale co-construction through the construction, data collection and analysis of data transmission network of energy consumption online monitoring system.
1. Project overview and construction goals
The Yuecheng District People's Procuratorate was established in January 1984. It is the only urban academy in Shaoxing City and is responsible for the procuratorial duties of Yuecheng District and Zhejiang Shaoxing Economic Development Zone, Paojiang New District and Jinghu New District. The Yuecheng District People's Procuratorate's case handling and professional technology building new construction project is located at No. 2, Wolong Road, Shaoxing Economic Development Zone, Shaoxing City. The basement is mainly used for garages, equipment houses and above-ground parts. The main function is office. This building is a second class high rise building.
The whole building adopts two independent 10KV high-voltage incoming lines, and is powered by the 10/0.4KV substation in the basement. The working voltage is three-phase five-wire 380/220V. The basement of the project is equipped with a 10/0.4KV transformer substation, and the sub-item is measured in the floor distribution box. There are 48 measuring nodes, including lighting, sockets and air conditioners. The specific construction objectives are as follows:
â— Realize the classification and measurement of energy consumption data;
â— Partial areas to achieve household monitoring, measurement and centralized management;
â— Clearly describe the current energy use status, identify problems in energy management, and provide directions for energy management improvement;
â— Enable energy management departments to effectively monitor and manage energy systems;
â— Provide reference data for energy conservation and consumption reduction research, design and construction.
Comprehensive energy consumption: automatic, real-time, online data collection, transmission and storage of the court's electrical resource consumption.
Classification measurement: According to the user's energy composition, statistics on each energy consumption for overall management.
Sub-item measurement: The electric energy consumption should be subdivided according to the type of electricity consumption: electricity for lighting and socket, electricity for air-conditioning, power for power, and other special electricity.
2. Design of online energy consumption monitoring system
The design of the entire energy consumption online monitoring system is based on the “Technical Guidelines for Energy Transmission Data Transmission of State Organs Office Buildings and Large Public Buildings Energy Consumption Monitoring Systemâ€, and the “Measurement of Office Buildings and Large Public Buildings in Zhejiang Provinceâ€. The system design standard and other related technical guidelines are based on the construction of an energy consumption online monitoring system that meets the actual needs of the user. The entire system completes the installation of the internal energy consumption meter and the energy consumption data collection device, and realizes the energy consumption data collected from the building. , remote transmission of data, data statistics and display functions. The whole system includes the original collection of energy consumption data, the online transmission of energy consumption data, and the online analysis and diagnosis of energy consumption data. The original collection of energy consumption data is realized through the installation of energy consumption metering device; the installation of communication management machine is realized. Online transmission of energy consumption data; through the collection of energy consumption data, form a visualization trend, determine the cause of high consumption in the diagnosis of higher energy consumption range; improve the operation and management mode through the later configuration of energy-saving and energy-saving products, and save energy and reduce consumption; Compare the data before and after energy saving and consumption reduction, and check the implementation effect of energy saving and consumption reduction.
2.1 Raw collection of energy consumption data
The original collection of energy consumption data is the basis of the entire energy consumption online monitoring system, and is the basic component of the entire energy consumption online monitoring system. It refers to the division of main energy types consumed by state offices and large public buildings. Including power consumption, water consumption, gas consumption, central heating and heat consumption, centralized cooling and cooling consumption and other energy consumption, sub-item energy consumption data refers to one or more types of classified energy consumption data subdivision For a number of items. For example, electric energy can be divided into four categories, socket lighting, air conditioning, special electricity and power, and each sub-item can be subdivided into several sub-items. The power for socket lighting includes the lighting of the main working area inside the building, and the electricity used for ordinary equipment. It can be subdivided into three parts: socket lighting, emergency lighting and corridor lighting, and outdoor lighting. Air-conditioning electricity mainly refers to the electric energy consumed for cooling and heating inside the building. It also includes two sub-items, the use of electric energy in the hot and cold station and the use of electric energy at the end of the air conditioner. Power consumption is the power used to provide power services in the building, including three items: elevator power, water pump power, and fan power. These classified item data are calculated and stored inside the collector, and a connection is established with the data center to transmit the original data. In this building, the energy consumption information involved mainly includes power consumption. According to the design requirements of the classification and sub-metering system, the electricity metering in this building adopts multi-function watt-hour meter, lighting distribution box and air-conditioning in each floor. Multi-function electric meters are installed in electric boxes, power distribution boxes and other special power distribution boxes to realize the sub-item collection of electric energy.
The multi-function meter adopts AC sampling technology, which can measure the current, voltage, power, power factor and electric energy parameters in the power grid separately. The multiplier can be set by the panel membrane switch. With RS-485 communication interface, using Modbus-RTU communication protocol, all multi-function meters have an active energy measurement accuracy of 0.5.
2.2 Data transmission
Data transmission refers to the process of uploading raw energy consumption data from a discretely distributed building group to a data center via a data collector through a remote communication method such as the Internet or GPRS, and processing the data to complete the original data storage process. . In the process, the data collector accumulates the timed data to form an extensible markup language (
2.3 Software function design of energy consumption online monitoring system
1) Energy consumption online monitoring data processing
Data validation
The general verification method for collecting data by the measuring device: verifying according to the maximum value and the minimum value of the measuring device range, and the collected readings smaller than the minimum value or greater than the maximum value are invalid data.
The meter active energy verification method: in addition to the general verification, it is necessary to carry out secondary verification. The method is: calculating the power by two consecutive data acquisition data increments and time differences, and judging that the power cannot be greater than the energy consumption equipment of the branch. 2 times the maximum power.
Itemized energy consumption data calculation
The energy consumption increment of each sub-item should be mathematically calculated according to the original data increment of each metering device, and the sub-item energy-stack daily data is calculated. The sub-item energy-saving daily data is a sub-item energy consumption in one day. The increment, the maximum value, the minimum value, and the average value during the collection interval; according to the daily data of the sub-item energy consumption, the monthly and yearly energy consumption data and their maximum, minimum, and average are calculated. value.
When the active energy of the meter appears full-scale jump, the maximum output of the meter must be increased on the number of acquisitions to ensure the correctness of the calculation results.
2) Energy consumption online monitoring management software architecture
The energy consumption online monitoring system adopts the distributed network structure of C/S (client/server) architecture. The system adopts standardized, networked and functionally distributed architecture with high reliability and maintenance convenience. The system has the ability to expand software and hardware, and supports the expansion of the system structure and the upgrade of functions. According to the scale and special needs of the system, the resources of each node of the network and the balance network load can be fully optimized, and the system can be implemented in stages.
3) Energy consumption online monitoring management software system
The whole management system consists of four parts: OPC data collection terminal, data split storage terminal, data monitoring terminal, data analysis and display terminal. The functions of each part are as follows:
OPC data acquisition terminal
Through the international OPC interface, the acquisition terminal stores the current values ​​of all the parameters in the smart meter in the database every 15 minutes for later energy analysis.
Data split storage terminal
The data collected by the collection terminal is first stored in the original value table of the database. In order to facilitate the subsequent data analysis and speed up the analysis, the data of the table needs to be split, and the results of the table data split are respectively stored in the energy consumption. Time summary table (summary by hour), energy consumption daily summary table (summary by day). The system ensures the accuracy of the splitting result by establishing a logically rigorous data splitting stored procedure in the database.
Data monitoring terminal
By reading data from the data collection terminal, the current real-time status information of all smart meters is displayed centrally, the running status of the entire system is displayed, and the alarm information is actively displayed according to the customer configuration, and the abnormal data is stored for future analysis.
Data analysis and display
Multi-dimensional analysis and drilling of energy consumption data in the database, using the current mainstream data graphical display components, visually reflecting and comparing various energy consumption data in the form of graphs, and counting the values, trends and distribution of energy consumption data. Chart display methods include: pie chart, histogram, stacked chart, line chart, area chart, dashboard, etc.
4) Software function module
Energy consumption integrated main interface
Through the comprehensive energy consumption main interface, it can reflect the comprehensive energy consumption of the energy consumption of the building in the current year and convert it into standard coal, and calculate the energy consumption per unit area; the energy consumption curve of the day is displayed at the bottom of the interface; Click on the upper area of ​​each classified energy consumption to jump to the energy analysis main interface of the classified energy consumption; the building can be switched through the drop-down box. .jpg)
Itemized electricity statistics
The electricity consumption is measured hour by day, day by day, month by month, and yearly. The statistical data uses various graphic display methods such as pie chart, bar chart, line chart and area chart to visually reflect the numerical values, trends and distribution of various statistical data. .jpg)
Trend analysis of power branch
Count the power consumption of various regions and equipments, accurately locate large consumers of electricity consumption, formulate energy-saving performance appraisal systems, and promote the effective implementation of energy conservation and consumption reduction. In order to establish operational record files with key equipment, long-term tracking and recording of energy efficiency analysis and evaluation results during equipment operation, combined with equipment maintenance records, provide a basis for equipment operation and maintenance. .jpg)
Energy consumption data with the same ratio analysis
The energy consumption of various types and major energy-consuming equipments was compared with the same period last year and the previous month value, and the energy-saving effect was tested. The energy-saving performance assessment and the improvement of energy-saving targets were performed based on the analysis results.
Energy consumption data time-sharing statistics
The energy type, load type, and regional energy consumption are differentiated according to time, and the energy consumption data is comprehensively analyzed on time, day, month, year, weekday, non-working day, etc., to accurately grasp the specific consumption of energy. It can be used to set peaks, flats, and valleys according to time of day, and count energy consumption in each period to reduce idle energy consumption. .jpg)
Real-time monitoring and early warning of energy data
Through high-precision intelligent instruments, automatic real-time, high-density real-time energy monitoring can be realized by technical means to reduce the "run, run, drip, leak" and measurement error of energy use. Real-time monitoring of the return data of the field instrument, reasonable control and early warning of the electric energy, timely detection and correction of the abnormal power consumption in the operation, and processing at any time. Set the over-alarm warning value of important equipment as needed, and highlight the alarm when it exceeds the standard and record it actively.
3. Significance of the construction of energy consumption online monitoring system
The large-scale public building energy consumption monitoring system is a multi-level, multi-functional, multi-regional, cross-regional, two-way exchangeable information complex system designed in accordance with the relevant technical guidelines for the construction of energy storage monitoring systems for state offices and large public buildings. By constructing such an energy consumption monitoring system, it is possible to monitor the energy consumption of buildings in real time, through the classification and calculation of energy consumption data, the time-sharing statistics of data, and the public display platform, which can promote the improvement of office buildings and large public buildings of state organs. The level of energy-saving operation management provides reference and strong support for government agencies to formulate effective policies and decisions, and implements on-line measurement, dynamic monitoring, centralized management, and scientific assessment of the electricity consumption of each energy metering point by the integrated energy management system software. Through effective end-of-end monitoring and management, comprehensive energy saving is realized comprehensively, which provides a basis for further energy-saving renovation of high-energy buildings.
references
[1] "Energy Efficiency Management System Design and Installation Atlas"
About the author: Yang Junjun, female, undergraduate. Position: Now working for Ankerui Electric Co., Ltd., contact number, mobile phone, QQ
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