Application of Electric Energy Management System in 1788 International Center
Abstract: Introduce the application of the power management system in the 1788 International Center.
Second, the system design plan![]()
3. System function![]()
Figure 2 35kV / 10kV distribution system parameter display interface![]()
![]()
![]()
![]()
![]()
![]()
V. Conclusion
Keywords: commercial center building; itemized measurement; centralized monitoring; electric energy management system
Electric Energy Management System Applied in 1788 International Center
HAO jian-chun1 GUO Yi 2 DONG Jian-feng2
SHANG HAI ACREL CO., LTD JIADING, SHANG HAI 201801
Abstract: The application of electric energy management system in 1788 international center is introduced
Keywords: Commercial center buildings; Subentry metering; Centralized monitoring; Energy management system
1. Project Overview
1788 International Center is powered by 35kV mains power from Anshi 7802 and Anshi 7829, and two 35kV / 10kV transformers on the basement of the main building after entering the house are stepped down. Anse Line 7802 passes through the 35kV / 10kV / 0.4kV transformer, and is supplied to the distribution circuit under the transformers T1, T3, T5, T7, and T9 in the building. In the distribution circuit under the T10 transformer, two emergency diesel generators are placed on the basement floor.
Second, the system design plan
       The 1788 International Center is designed with a 35kV power distribution room, a 10kV power distribution room, four 0.4kV power distribution rooms and an emergency diesel generator room, all located on the ground floor, with a total of about 360 distribution circuits, each The circuit is equipped with intelligent power meters to monitor the working status of all power distribution circuits in the power distribution room. Each transformer is equipped with a temperature controller to collect its temperature. In addition, power meters are installed on the distribution boxes of the strong electricity rooms, air-conditioning rooms, exhaust fan rooms, submersible pump rooms, elevator machine rooms, and heat exchanger rooms on each floor. The lighting, air conditioning, fans, elevators and other equipment and equipment Office tenants use electricity and monitor about 700 circuits in total. According to the design plan of the design institute, except for the tenants, air conditioners and fans using electricity meters for local sub-metering, the electricity consumption of lighting, power, elevators and other electrical equipment is in the low-voltage distribution room For centralized measurement, the distribution circuit of the distribution box only uses an ammeter to monitor the operating status [1].
       The design requires the distribution automation energy management system to centrally display the operating status of the distribution room and the designated circuit of the floor in front of the staff on duty. ; Remote detection of the three-phase current, active power and opening and closing status of the 0.4kV feeder circuit in the distribution room; the three-phase current and active power of the tenant distribution box, air conditioning distribution box and fan distribution box on the floor Telemetry, and telemetry of the three-phase current of distribution box circuits such as floor lighting, power, and elevators. The real-time requirements for telemetry in distribution rooms are high, and the real-time requirements for floors are relatively low. In addition, all power consumption data must be shared with the IBMS system.
        In this project, considering the large number of on-site instruments, two system hosts are placed in the 35kV duty room to monitor the power distribution system and floor power distribution system respectively. The system topology is 3 layers, namely field device layer, communication management layer and station control management layer [2], drawing on the definition of physical layer, data link layer, network layer, transport layer and application layer in ISO-OSI network model.
Figure 1 Schematic diagram of system topology
        On-site equipment layer equipment includes Ahaifa Comprehensive Insurance, Dandong Huatong's multi-function instruments and Jiangxi Huada Electronics' dry-type transformer temperature controller, etc. These devices are installed on the corresponding distribution circuits according to the requirements of the design institute.
Referring to the OSI network structure model, all devices at the field device layer are agreed to be RS-485 interfaces at the physical layer.
       Because all the power distribution rooms and generator rooms are in the main building B1F, the distance from the 35kV duty room is not more than 100 meters, so all the instruments in the power distribution room are connected to a communication management machine in the 35kV duty room by RS-485 bus, and the bus length Within 200 meters, no more than 25 instruments are connected to ensure the real-time and reliability of communication.
       Due to the large number of instruments on the floor and the loose distribution of power distribution boxes, considering the project cost, 4 RS485 hubs are used, which are installed in the main building 16F, 4F, B1F strong power room and podium B1F strong power room, within a certain range. After the instrument communication bus is centralized, each is connected to the serial port of the communication management machine in the 35kV duty room with an RS-485 bus. This solution sacrifices the real-time nature of part of the communication (the RS-485 hub has limited drive capacity, resulting in a large communication delay), which greatly reduces the number of cables required in the project construction (the actual number of cables used in construction is about Use 1/5 of RS-485 hub).
       The main equipment of the communication management layer is two communication management machines, 32 protocol conversion isolators and one industrial Ethernet switch. The lower serial ports of the two communication management machines are connected to the RS-485 buses of each instrument through the RS-485-232 protocol conversion isolator, and the upper ends are connected to the two monitoring hosts through switches and Ethernet TCP / IP protocol.
       The station control management layer is composed of two DELL mainframes, displays, printers, UPS power supplies and other equipment. It controls the data collection, processing and interaction through Acrel-3000 power management system software to complete the function of the application layer in the network model.
       The data exchange between the monitoring host and the field instrument is realized in the form of a message, and the main protocol of the data link layer is Modbus-RTU. Because this system needs to synchronize the active power values ​​of all loops to the IBMS system, it is agreed to use Modbus-TCP protocol to forward data to the intelligent building management system.
3. System function
       (1) 35kV, 10kV transformer parameter display: As shown in Figure 2, the energy management system collects the three-phase phase voltage, three-phase line voltage, three-phase current, total active power, total Reactive power, total power factor and active power cumulative value, the data on the 35kV side and 10kV side are listed together, which is convenient for the duty personnel to compare and check. The three-phase temperature of the transformer collected by dry-type transformer temperature control is also reflected on this interface in the form of values ​​and curves.
Figure 2 35kV / 10kV distribution system parameter display interface
       (2) A schematic diagram of the 35kV / 10kV power distribution system: In addition to displaying the conventional parameters of the power distribution system, the power management system of the host of the power distribution room also draws the software interface in the form of a power distribution system primary diagram. The trend of the power distribution system is more clear. The schematic diagram of the 35KV power distribution system is shown in Figure 3. In addition, conventional electrical parameters such as voltage and current can also be viewed on a schematic interface.
Figure 3 A schematic diagram of the 35kV distribution system
       (3) A schematic diagram of the 0.4kV distribution system (as shown in Figure 4): The operation status of the distribution circuit of the 0.4kV distribution room is displayed in a graphical form, and the collected electrical parameters, transformer temperature and circuit breakers are opened and closed. The parameters are displayed on the interface, the entire 0.4kV distribution system is divided according to the power distribution room and the transformer, and the interface is displayed separately. Each circuit is marked with its cabinet number, circuit number, circuit use, and low-voltage system total number to further clarify the configuration. The direction of the electrical system.
       Figure 4 A schematic diagram of 0.4kV distribution system
       (4) Data collection and display of the floor distribution box (as shown in Figure 5): The floor energy management host collects the data of the instruments on the distribution boxes around the B1F ~ 30F of the 1788 center, divided by floor, according to the location of the distribution box And number to sort the data, display the three-phase current and active power of the tenant, air conditioner and fan circuit, and display the three-phase current of lighting, emergency lighting, power, elevator, water pump and some other circuits.
Figure 5 Data display interface of the floor distribution box
       (5) Report function: The power management system of the power distribution room has customized two function reports for the user. One is shown in Figure 6. For a main circuit, the user can choose the time to generate the circuit at this time. The historical value of the parameter. The other type of report is generated by the user after a simple operation, and the system will automatically generate daily, monthly, and annual reports on all circuits in the power distribution room, part of the air-conditioning circuits on the floor, and electricity consumption of the tenant's electricity meters.
Figure 6 Customized All Electric Parameters Report
       (6) Accident alarm and recall: For electrical duty personnel, the real-time and accuracy of the trip alarm are very important indicators. The alarm function customized by the energy management system is mainly for the switching of the low-voltage circuit breaker in the distribution room When the gate is shifted, an alarm sound is emitted through the alarm window shown in Figure 7 and an external speaker prompts the shift personnel that the low-voltage feed circuit breaker has shifted. According to the content displayed in the alarm window, the alarm circuit can be immediately located and responded to ensure The power distribution system of the building is stable.
Figure 7 Alarm function interface
       (7) Communication status display (as shown in Fig. 8): Display the communication status of all meters, according to the bus, power distribution room or floor location where the meter is located, mark its communication address and communication status.
Figure 8 The communication status diagram of the equipment of the floor energy management system
       (8) Data forwarding: This system is mainly responsible for front-end data collection and processing, and forwards the data to the higher-level building automation system, and other building automation systems no longer collect metering data. The forwarded data mainly includes the electrical energy data of all circuits in the 35kV / 10kV / 0.4kV distribution room; electrical energy data of floor tenants, air conditioners and fan circuits.
4. Problems and solutions
       1. The general contractor of the project mentioned that the collection points of the electrical energy management system are about 900 points, while the actual collection points are more than 1,000 points, which is large and widely distributed. The temporary distribution box and the wrong distribution box number used by the construction unit of the strong power construction cause a lot of trouble to the communication construction of this system. During the construction of the project, check the completeness and accuracy of the distribution box information, and promptly point out the errors in the work of the strong power construction unit and require their rectification.
       2. Four RS485 hubs are installed in the strong electricity room on the floor. The 220VAC power supply is taken from the nearest distribution box. The preliminary plan does not regulate the 220VAC power supply, that is, it is directly taken from the nearest distribution box. During the late commissioning of the project, it was found that because the 1788 center was not completed, the floor part was often powered off due to construction, and sometimes the power supply of the hub was disconnected, resulting in the disconnection of the system data link. Therefore, the auxiliary power supply of the field communication equipment was rectified. The power supply-powered emergency lighting box takes the 220VAC power supply at the lower end of the spare air switch and attaches a label to inform the maintenance personnel that they cannot be turned off at will to ensure the stability of the data link.
       3. The Ethernet cable used by the system to forward the data to the IBMS system has been damaged three times due to the rodent infestation in the 35kV duty room, and then the owner of the 1788 center was contacted to solve the problem.
       4. Most of the instruments in the power distribution room and distribution box of the 1788 International Center were provided by Dandong Huatong. After the system was put into operation, many problems with instrument configuration were found, such as the emergency lighting box 9PME on the 9th floor of the main building and the emergency on the 2nd floor. In the lighting box 2PME1, etc., the meter current transformer transformation ratio is 100/5 and 300/5, and the power management background shows that its three-phase current is about 0.006A, 0.016A, 0.008A. After checking with the owner management personnel on site, it was found that the decimal point was set to 3, that is, the highest display value was only 9.999A, and the setting was obviously wrong. During the on-site acceptance of the project, it was also found that many instruments had similar problems. Party A shall notify Dandong Huatong for rectification.
V. Conclusion
       The 1788 International Center Energy Management System was officially put into operation in April 2012. Through the coordinated work of the host in the distribution room and the floor host, the on-duty personnel do not need to go to the distribution site to check it under normal circumstances, realizing the unattended distribution room 1. Automation of distribution system.
       The article comes from: "Automation Application" 2012 issue 7.
references
       [1]. Ren Zhicheng Zhou Zhong. Principles and Application Guide of Electric Power Measurement Digital Instruments [M]. Beijing. China Electric Power Press. 2007. 4
       [2]. Edited by Zhou Zhongzhong. Product selection and solutions of smart grid user-side power monitoring and energy management system [M]. Beijing. Machinery Industry Press. 2011.10
About the Author:
Yu Jing, female, undergraduate, engineer of Wuhan Ankerui Electric Co., Ltd., the main research direction is intelligent power monitoring and power management system
This type of led power supply offers adjustable current for high mast lighting application with constant power(wide range selection),universal input voltage(90~!605Vac).Overall protection:Short circuit/Over temperature/Over Voltage.IP67, protect against more elements, suitable for dry/wet/damp location.0-10V&PWM dimmable,deliver maximun flrxibility with customized operating setting.Surge immunity: DM-5KV, CM-10KV.MOSO`s World wide distribution net gurrantee fast delivery&waranty service.
Approvals: in preparation if not already printed on product label.
High Mast Light LED Driver, LED High Power High Mast Driver,Outdoor High Mast Light LED Driver,Quality High Mast Light LED Driver
Moso Electronics , https://www.mosoleddriver.com