This paper introduces the comprehensive architecture of the Eastern Wanuo enterprise, using intelligent power meters to collect various electrical parameters and switching signals at the power distribution site. The system adopts the on-site local networking mode. After the network is connected, it communicates through the field bus and travels to the background. Through the Acrel-5000 building energy consumption monitoring system, the real-time monitoring of the power distribution circuit of the substation is realized.
Yang Junjun (Ankerui Electric Co., Ltd., Shanghai 201801, China)
1 Introduction
At present, China is already the world's second largest energy producer and consumer. Statistics show that China's building energy consumption accounts for about 28% of the country's total energy consumption. Of the 2 billion square meters of new buildings built in China each year, 99% of them It is a high-energy building; only 4% of existing buildings have adopted energy-saving measures. Large public buildings not only have high energy density, but also have very serious energy waste. They have huge energy-saving space. The promotion of building energy conservation is imperative, energy conservation and consumption reduction, and measurement first.
Relevant local regulations require that “the building energy monitoring system should be included as part of the new construction equipment and facilities system and included in the construction plan; the third phase of the nuclear engineering institute belongs to the large public building office building. The design basis of Shanghai energy consumption monitoring is mainly “DGJ68- 2068-2012" Technical Specifications for Energy Monitoring in Public Buildings.
2 Design basis
The building energy consumption monitoring system is designed and developed according to the “State Office Office Building and Large Public Building Energy Consumption Monitoring System†formulated by the Ministry of Housing and Urban-Rural Development. The design basis is sufficient and the standards are perfect.
a. Technical requirements of the Ministry of Housing and Urban-Rural Development
Technical Guidelines for Sub-item Energy Consumption Data Collection of State Organs Office Buildings and Large Public Buildings Energy Consumption Monitoring System
"Technical Guidelines for Sub-item Energy Consumption Data Transmission of State Organs Office Buildings and Large Public Buildings Energy Consumption Monitoring System"
"Technical Guidelines for Building Sub-metering Design and Installation of Office Buildings and Large Public Buildings Energy Consumption Monitoring System"
Technical Guidelines for Construction and Maintenance of Data Centers for Office Buildings and Large Public Building Energy Consumption Monitoring Systems
"Regulations on the Construction, Acceptance and Operation Management of Energy Monitoring System for Office Buildings and Large Public Buildings of State Organs"
"Guidelines for Software Development Guidelines for Office Buildings and Large Public Buildings Energy Consumption Monitoring System"
b. Technical plans for building energy monitoring in various provinces and cities
DGJ08-2068-2012 "Shanghai Municipal Public Building Energy Monitoring System Engineering Technical Specification"
DBJ/T13-158-2012 "Technical Specifications for Public Building Energy Monitoring System in Fujian Province"
c. Energy consumption metering device national and industry standards
DL/T 645-1997 Multi-function Energy Meter Communication Protocol
DL/T 645-2007 Multi-function Energy Meter Communication Protocol
CJ/T 188-2004 Household metering data transmission technical conditions
GB/T 19582-2008 Industrial automation network specification based on Modbus protocol
3 Project Overview
The area of ​​the Eastern Wanuo Enterprise Center project: the total land area is about 95,530 square meters, located at No. 1599, Xinjinqiao Road, Pudong New Area, Shanghai. The project consists of 8 standard factory buildings, 2 integrated office buildings and 2 10KV switch stations. There are also some supporting display rooms with a building area of ​​49,352.07 square meters and a total construction area of ​​284,340.98 square meters.
The construction project includes building units E1#, E2# (second class high-rise office buildings); A1#, A2#, B1#, B2#, B3#, C1#, C2#, D# (standard factory buildings are Class C high-rise buildings) ); E1# (for multi-storey Class C plant); E2# (underground garage and supporting service room in the area is a type of parking garage). The glass curtain wall area is 66,500 m2.
Among them, A1#, A2# standard workshop and E1#, E2# office building total floor is 12 stories, building height is 50m, floor height is 3.9m; B2#, C1#, C2# standard factory building total floor is 11 floors The building height is 49.65m and the floor height is 4.1m; the B1#, B3#, D# standard factory buildings have 10 floors, the building height is 49.90m, the floor height is 4.1m; the E3# standard factory building total floor is 2 The floor has a building height of 10.35m.
The use of the project is as follows:
4 Equipment selection
a. Multi-function network instrument
Function: active energy, current, voltage, active power, power factor
Accuracy class: the feeder of the substation is not lower than 0.5; the accuracy of the transformer: not less than 0.5
Electrical interface: RS-485
Communication protocol: MODBUS, DL/T645
Installation location: all circuits in the substation.
Installation method: embedded
b. Data collection function
1 Providing the static information of the metering device The manual input function can be set according to the relationship between each metering device, each category, and the energy consumption of each item;
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2 It can flexibly set basic communication attributes such as communication protocol, communication channel, metering device name and configuration position of each metering device;
3 It can monitor the communication status of each metering device and transmission equipment in the system online, with fault alarm prompt function;
4 It can flexibly set the data data collection period of each collection device in the system. Not more than 15min.
5 system architecture
Acrylic's Acrel-5000 building energy analysis management system uses the workstation host, communication equipment and measurement and control unit as the basic tools, providing a basic platform for real-time data acquisition, switch status monitoring and remote management and control of large public buildings. The detection and control equipment constitutes an arbitrarily complex monitoring system. The system mainly adopts a layered distributed computer network structure, such as the system structure shown in Figure 1: The East China International Enterprise Center project energy management system station management layer and network communication layer. There are a total of 12 power distribution rooms on the site. Each communication room is equipped with a communication collection box. The communication collection box is equipped with a ring network switch and a communication management machine for data exchange.
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System structure diagram 1
The construction project includes building units E1#, E2# (second class high-rise office buildings); A1#, A2#, B1#, B2#, B3#, C1#, C2#, D# (standard factory buildings are Class C high-rise buildings) ); E1# (for multi-storey Class C plant); E2# (underground garage and supporting service room in the area is a type of parking garage). As shown in Figure 2 of the system structure: for the energy management system of the Eastern Wanuo Enterprise Center project, the field device layer at the lower end of the collection box (see the lower end of the communication management machine 1). The power meter in the power distribution room is directly connected to the communication management machine 1 in the power distribution room by means of a bus connection, and the water meter, the energy meter and the gas meter in the water pump room, the freezer room 3 and the freezer room 4 are all passed through the bus. Connected to the communication management machine 1 for data integration upload; the number of instrument connections on each bus
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System structure diagram 2
6 system software module
a. Comprehensive energy consumption main interface
Reflecting the comprehensive energy consumption of the energy consumption of the buildings and the conversion to standard coal in the current year, and calculating the energy consumption per unit area;
Although there are many energy consumption classifications in buildings, the main energy, water, gas and renewable energy sources that can be measured by the meter are the time-of-day energy consumption curves of the four types of energy consumption at the bottom of the interface; click each The upper area of ​​the classified energy consumption can be jumped to the energy analysis main interface of the energy consumption of the classification;
The building can be switched through the drop-down box, and the building picture can be replaced according to the project requirements;
b. Classification energy main interface
Reflecting the energy consumption and comparison, growth percentage and added value of the energy consumption (eg electricity) of a certain classification on the same day and the same period of the previous year, the current month and the same period of the previous month, the current year and the same period of the previous year;
Reflecting the energy consumption trends of the past 48 hours, the past 31 days, the past 12 months, and the past 3 years of a classified energy consumption;
The energy consumption pie chart for the month reflecting the energy consumption of a sub-item;
Reflecting the energy consumption of a certain classification in each month of the year;
c. Classification energy consumption branch energy consumption report
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The branch road can be flexibly selected, and the daily, monthly, weekly, seasonal and annual energy of the branch road energy can be counted in a certain period of time;
Through the powerful pivot table, users can perform a variety of data statistics and combine and sort the data;
Statistics can be displayed in a variety of charts, such as histograms, dotted lines, stacked charts, and pie charts;
Statistics can be exported to Excel;
d. Classification energy consumption branch time-use energy statistics
It can be used to count the time of each branch (point, peak, flat, valley);
By setting the energy price per unit time (point, peak, level, valley) in the basic data, the amount of energy used in the time period can be counted;
This function is required to use a power meter with a multi-rate function;
Statistics can be exported to Excel;
e. Classification energy consumption branch non-working day energy
Statistics on the working days of each branch and non-working days, non-working days can be flexibly set through the system
Statistics can be exported to Excel;
f. Year-on-year analysis of classified energy consumption branches
Count the monthly energy use of each branch in the same year and use energy in the same period last year;
g. Classification energy consumption branch
Query the meter readings of any two branches of each branch and calculate the difference;
Time accuracy to minutes;
h. Analysis of energy consumption trend of classified energy consumption branches
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It can query the energy parameters (such as voltage, current, power, power factor, harmonics, etc.) of any branch for a certain period of time. The specific queryable parameters are related to the installed instrument and system configuration.
The data is displayed in the form of a chart or a table. The chart can be enlarged, reduced, and moved by mouse operation; the data can be sorted (maximum, minimum);
Data can be exported to Excel;
i. Classification energy consumption branch
Comparing the energy value of the current branch with its lower branch, and calculating the difference and the percentage difference;
When the percentage difference between the two exceeds a certain value, the color is prompted with a bold color;
This function is mainly to ensure the integrity of the energy measurement system and the verification of the data;
j. Departmental performance evaluation
Set the energy consumption plan value of each department in the system and compare it with the actual value.
k. Energy distribution interface for sub-items, regions and departments
l. Configuration options
According to the relevant technical specifications, the basic information of the building is configured, for example: building function, building area, air-conditioning area, building address, etc., wherein the building area and other information will be analyzed by energy consumption per unit area;
Configure the basic information such as the type, model, and manufacturer of the instrument used in the project, and add the monitoring parameter information that can be provided by the instrument. The configuration here affects the energy consumption statistics, the time-use energy statistics, and the parameter query function.
Configure all the meters used in the project, save the address, ratio, corresponding collector, code, name of the monitoring circuit, etc. of the meter;
The information about the meter, the proportion, and the calculation method involved in configuring the energy consumption statistics can be flexibly configured according to the project conditions. The configuration information here will affect the functions of the energy consumption sub-items in each category. ;
Configure each department to use the corresponding meter, calculation method, proportion and department energy consumption plan. After completing this configuration, the department energy consumption analysis function module will be enabled;
Configure the meter, calculation mode, and proportion of a certain energy-using area in the building. After completing this configuration, the area energy analysis function module will be enabled.
7 Outlook
According to the analysis of the energy consumption operation effect of the Eastern Wanuo Enterprise Center, a typical energy consumption analysis model was established and unified analysis.
a. Establish a building energy consumption measurement system, reduce the energy consumption of the building, find the black screen of energy consumption, and make the energy-saving transformation more targeted. At the same time, consolidate the results of energy-saving transformation through management measures such as metering and charging and performance appraisal.
b. Select energy-saving equipment (energy-saving lamps, inverters, heat recovery devices).
c. Even the best energy-saving equipment can not afford to save energy. By increasing the automation energy-saving equipment, formulate equipment operation strategies, reduce human intervention, and centralized control, so that energy-saving equipment is achieving energy conservation.
d. Quantify the results of energy-saving renovation through the same-loop analysis data provided by the energy consumption monitoring system to maximize the energy-saving effect.
8 Conclusion
The total area of ​​large-scale public buildings is less than 4% of the total area of ​​urban buildings, but the total energy consumption accounts for 22% of the total electricity consumption of cities and towns. The annual electricity consumption per unit area of ​​large public buildings reaches 70-300KWh, which is 10 for ordinary residential buildings. ~20 times. Public buildings are the key to energy-saving and energy-saving. It is of great significance to do a good job in the energy-saving work of the third-phase public building office building of the Nuclear Engineering Institute. It is of great significance to promote and promote energy-saving work and achieve energy-saving and emission reduction targets.
references:
[1]. Technical requirements of the Ministry of Housing and Urban-Rural Development
[2].DGJ08-2068-2012 "Shanghai Municipal Public Building Energy Monitoring System Engineering Technical Specification"
About the author: Yang Junjun, female, undergraduate. Position: Now working for Ankerui Electric Co., Ltd., contact number, mobile phone, QQ
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