Yang Junjun
Ankerui Electric Co., Ltd., Shanghai Jiading
1 Project overview and construction goals
Shaoxing Golden Age Building is located in Shaoxing City, Zhejiang Province, close to Meilong Lake, and on the west side is the Caizhi Building of Di Dang B5 Block. The project has three high-rise buildings. The 25-300m2 hardcover layer is 4.5 meters high and can be innovatively superimposed, mainly 100. In the office above the square meter, the three buildings are the three buildings A, B and C, all of which are 19-storey buildings.
According to the requirements of the design drawings, the project needs to manage the power consumption of each power circuit in the power distribution box of the power box and lighting box of the Golden Age Building. The system passes the multifunctional energy meter, communication network and computer software. Real-time data acquisition, data calculation, data statistics, power analysis, etc. in the operation process of various electrical equipment to ensure the safety and reliability coefficient of complex power supply and distribution systems, achieve rapid response to failures; comprehensively grasp the cost structure of building energy consumption To ensure the smooth implementation of energy-saving plans and measures; scientific and intelligent management, improve efficiency, reduce losses, and optimize operating costs. The system consists of the station management layer, the network communication layer and the field device layer. The system requires that devices that collect data intensively be minimized to ensure the communication reliability of the system.
2 Design of power management system
In the design of the monitoring system, the characteristics of the building itself, the actual structure of the power system, the actual load capacity of the power system, and other factors are fully considered, and the monitoring equipment is reasonably selected, which is beneficial to reducing the cost of the system operation, and also has Conducive to the realization of system functions.
The Shaoxing Golden Age Building consists of 19-storey buildings, all of which are office buildings and hotel-style apartments. The electrical energy consumption of the entire building is mainly for the electricity used by offices and hotel-style apartments and for public parts. In the design of the power distribution system, one distribution box is ensured for each floor of each building, which is responsible for the electricity used by the equipment in this layer, and the power of the distribution box is led to the substation. This guarantees the integrity and clarity of the power distribution system. Therefore, when doing energy metering, we need to separately measure the incoming and outgoing circuits of the floor and build a complete measurement system, because for the power distribution, the incoming power and the feeder power The sum of the consumption errors should be within a reasonable range. The incoming line energy metering is taken as the first level metering, and the feeder line energy metering is the second level metering. Then the sum of the first level metering and the second level metering value should be within a reasonable range, and the limit value is 2%. If the error exceeds the reasonable range, then the power consumption outside the measurement system occurs, that is, stealing electricity and private use for private use, which not only causes economic losses, but also has potential safety hazards. Building a complete measurement system can detect such abnormal power problems in time.
2.1 Selection of measuring equipment
The on-site metering part of the energy management system of the Golden Age Building in Shaoxing is realized by the electric energy metering meter. According to the power consumption characteristics of the incoming and outgoing lines and different electrical equipment, the metering meter that meets the respective power consumption characteristics is selected: the power distribution box incoming circuit adopts three Phase multi-function electronic metering meter, secondary access; three-phase outlet circuit adopts three-phase electronic ordinary electric meter, direct access; single-phase outlet circuit adopts single-phase electronic ordinary electric meter and directly accesses. All electric meters are installed by rails, and a total of 1,645 rail-type watt-hour meters are available in three buildings.
2.2 Power Management System Network Composition
The system adopts a layered and distributed system structure, which is vertically divided into three layers: the monitoring layer, the communication network layer, and the field control layer. The system uses high-reliability industrial control computer and software and hardware systems, high-performance fieldbus technology and network communication technology. The whole system runs safely, stably and reliably, and is easy to use and maintain.
The monitoring layer includes the engineering station and the telecontrol communication station, including the monitoring computer, network switch, printer, UPS and Acrel-3000 power management software. The software part has a good human-computer interaction interface, and the communication management machine collects the data through the data transmission protocol. The various types of data information on the site are automatically calculated and processed to reflect the operation status of the site in the form of graphics, digital display, sound, etc. The energy measurement management function is designed to conform to the user's report format, and the data in the report is strictly measured according to various standards. To build a complete measurement system, users only need to find and print, which greatly facilitates the operation and improves the work efficiency.
The communication network layer includes communication management machines, photoelectric converters, data acquisition boxes, and communication optical networks. The network structure is shown in the following figure:
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2.3 Main design reference standards
GBT 14598.300-2008 "General technical requirements for microcomputer transformer protection devices"
DL/T 5430-2009 "Technical Regulations for Design of Remote Monitoring Center for Unattended Substation"
GB/T 50063-2008 "Design specifications for electrical measuring instrumentation of electrical installations"
"18 major power grid major anti-accident measures of State Grid Corporation"
DL 448-91 "Management Regulations for Electric Energy Metering Devices"
ISO/IEC11801 "International Integrated Cabling Standards"
2.4 Power management system software function design
The system is designed according to the actual needs of the customer, and realizes a main wiring diagram interface display; electrical parameter telemetry and electrical parameter over-limit alarm; event record; system operation abnormal monitoring; fault alarm and operation record; report query and printing; system load real-time Main functions such as history curve and user rights management.
Data collection and processing
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.
Energy sub-item, branch road metering
The electricity consumption (lighting socket, power, etc.) consumption is divided into statistics. The realization of the sub-item helps the user to know the electricity consumption of each sub-item; counts the energy consumption of each area, each floor and each loop, and accurately locates the large consumers of electricity consumption. Formulate an energy-saving performance appraisal system to 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.
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Construction of electricity management and measurement system
In order to realize the supervision of the electricity consumption of each circuit of Shaoxing Golden Age Building, the system designed the electricity management report. The system collects the active energy according to the different circuit names. According to the principle of construction of measurement system, the daily report, monthly report and annual report are automatically generated, and the energy consumption of each incoming loop and outgoing loop is reflected in the same report, and the sum of the power consumption of the loop loop is calculated, and the outgoing loop and the incoming loop are Line loop error, percentage error (whether the error percentage exceeds the standard), etc., help users find this abnormal power problem in time.
At the same time, the power management system can query the electricity consumption in a certain period of time of a certain loop, which 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 the office workers in each enterprise has been greatly improved, and the energy consumption of the enterprise management office has been effectively saved.
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3 Significance of applying power management system in power supply and distribution design
In summary, the power management system helps the power unit to improve efficiency, reduce losses, and reduce operating costs. The power management system can effectively ensure grid management efficiency, reduce power operation costs, and become an indispensable component in power supply and distribution design. section. The power management system's communication, fault alarm, data storage and record functions make the staff more convenient in actual work. They can directly understand the operating status of the power system through the man-machine interface, and can quickly transmit the operation commands. The data transmission of the device is realized through network transmission. Therefore, different power management systems can design different networking modes to ensure that data information can be transmitted quickly and accurately. On the other hand, in the design of building and enterprise power distribution system, the power management system should be used, and the monitoring equipment should be selected according to the actual situation.
The power management system is installed in commercial buildings, office buildings and other places, which can realize the sub-item, branch and sub-area management of electric energy in the building. It can not only accurately indicate the power consumption status of the loop, but also has the functions of network communication and the like. The computer, serial server and other equipment are combined to display the operation status of each distribution circuit in the building in time. When the load of the power system in the building exceeds the standard, the power management 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 relevant personnel can analyze the power consumption status of various parts of the building, and make the electricity activities in the building safer, thus ensuring the safety of the people in the building and improving the office. Staff efficiency.
references
[1] Ankerui "Design and Installation of Energy Efficiency Management System"
About the author: Yang Junjun, female, undergraduate. Position: Now working for Ankerui Electric Co., Ltd., contact number, mobile phone, QQ
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