Abstract: This paper introduces the power distribution system and energy management system of the VIP Living Hall in Shanghai World Expo Village. It utilizes intelligent power meters and microcomputer protection to collect various electrical parameters and switch signals from the power distribution site. The system is networked, and after networking, data is transmitted to the backend via fieldbus communication. The Acrel-3000 energy management system enables automatic management of building energy consumption and provides the functions of the Acrel-3000 energy management system, providing statistical data on building energy consumption and a basis for energy conservation decisions.
Keywords: Expo Village; smart power meter; Acrel-3000 model; power management system
The application of Energy Management System in VIP Living Museum in Shanghai World Expo Village
LU Ming 1
1.Shanghai Acrel ltd,Shanghai 201801
Abstract: Introducing distribution system and power management systems of VIP Living Museum in Shanghai World Expo Village, adopting the way of systmen network that collecting a variety of electrical parameters and switching signals of Intelligent Power Meter and the Computer Protection Acquisition distribution scene, and later conveying to the backstage through field bus communication, through Acrel-3000 energy management system to achieve automated construction power consumption management and the functions, to statistic building energy data, to offer the strategic decision basis of energy conservation.
Key words: Expo Village; Intelligent Power Meter; Acrel-3000; Energy Management System
0 Overview <br />The Shanghai Expo Village VIP Lifestyle Hotel is a five-star hotel and the highest-standard hotel among the Expo Village projects supporting the 2010 Shanghai World Expo. The hotel covers an area of approximately 25,500 square meters, with a total building area of 66,000 square meters and a building height of approximately 95 meters. It has 26 floors above ground and 2 floors underground, with a total of 443 guest rooms.
The power distribution system of the VIP Living Hall in Shanghai Expo Village is divided into two main parts: high voltage and low voltage. The high voltage section consists of two 10KV incoming lines and four transformers. The InterContinental Expo Hotel is a significant power load user; as the highest-standard hotel in the Expo Village project, the importance of a stable power supply is self-evident. The low voltage section includes a low-voltage distribution room, a chiller room, a water pump room, and emergency diesel generator sets. There is also a low-voltage distribution room on each floor to supply power to the various equipment circuits on that floor.
The Acrel-3000 power management system for this power distribution system fully utilizes the latest advancements in modern electronic, computer, network, and fieldbus technologies to perform distributed data acquisition and centralized monitoring and management of the power distribution system. It networks the secondary equipment of the power distribution system, connecting the distributed field devices of the substations into a cohesive whole through computers and communication networks, thereby achieving remote monitoring and centralized management of the power grid equipment operation.
1. Power Management Requirements Analysis and System Configuration
As this project involves a five-star hotel, it requires monitoring all circuits equipped with smart meters on-site. Furthermore, it necessitates categorizing and statistically analyzing the electricity consumption of air conditioning, lighting, and power systems, with daily reports to be automatically generated. The operational status of on-site equipment, including circuit opening and closing status, also needs to be displayed in real time. Due to the large number of on-site instruments, a network configuration of three serial port servers plus a switch was employed.
This system adopts a hierarchical distributed computer network structure:
The three layers—interval layer, communication layer, and station control layer—are shown in the diagram below:
The main equipment in the field monitoring and control layer includes: multi-functional network power meters, microcomputer protection devices, etc. These devices are installed in electrical cabinets corresponding to the primary equipment. All of these devices use RS485 communication interfaces and network communication through shielded twisted-pair cables to achieve on-site data acquisition.
The communication control layer mainly consists of a communication server, whose main function is to centrally collect data from the scattered field acquisition devices and transmit it to the station control layer, thus completing the data interaction between the field layer and the station control layer.
Station control management layer: Equipped with high-performance industrial computers, monitors, UPS power supplies, printers, and other equipment. The monitoring system is installed on the computer, centrally collecting and displaying the operating status of field equipment, presenting it to the user in a human-machine interactive format.
All the above network instruments use RS485 interface and MODBUS-RTU communication protocol in the field. RS485 uses shielded cable for transmission and generally uses two wires, which is simple and convenient to connect.
2. Main functions of the power management system
2.1 Data Acquisition and Processing Data acquisition is the foundation of power distribution monitoring. It is primarily accomplished by underlying multi-functional network meters, enabling real-time local display of remote data. The signals to be acquired include: three-phase voltage U, three-phase current I, frequency Hz, power P, power factor COSφ, electricity consumption Ep, and the operating status of remote equipment.
Data processing mainly involves displaying the collected electrical parameters to users in real time and accurately, in order to achieve the automation and intelligence requirements of power distribution monitoring. At the same time, the collected data is stored in a database for users to query.
2.2 The human-computer interaction system provides a simple, easy-to-use, and user-friendly interface. It adopts a fully Chinese interface, displays the primary electrical wiring diagram of the low-voltage power distribution system using CAD graphics, shows the status of power distribution system equipment and corresponding real-time operating parameters, and features timed screen rotation, real-time dynamic screen refresh, analog quantity display, digital quantity display, and continuous recording display.
2.3 Fault Alarm and Accident Recall When an operational fault occurs in the power distribution system, an audible and visual alarm will be issued in a timely manner to prompt the user to respond to the faulty circuit. At the same time, the time and location of the event will be automatically recorded so that the user can query and recall the cause of the fault.
2.4 Database Establishment and Query: This mainly involves the timed collection of telemetry and teleindication data, the establishment of a database, and the periodic generation of reports for users to query and print.
2.5 User Access Management: Different access groups are set for users at different levels to prevent losses to production and daily life caused by human error and to ensure the safe and reliable operation of the power distribution system.
2.6 The system periodically collects current load parameters of incoming lines and important circuits, and automatically generates operating load trend curves, making it convenient for users to understand the operating load status of the equipment in a timely manner.
2.7 The electricity cost management system automatically performs daily, monthly, and yearly electricity statistics, and allows for the setting of peak, off-peak, and valley periods, enabling time-of-use billing for electricity and generating daily, monthly, and yearly reports.
3 Case Analysis
The low-voltage power distribution system of the VIP Living Hall in Shanghai Expo Village mainly consists of four 10kV/0.4kV distribution transformers. This system is primarily responsible for real-time dynamic monitoring of the low-voltage incoming lines and corresponding outgoing circuits, as well as monitoring the circuits of the power meters installed on each floor.
The incoming circuit uses the ACR230ELH multi-functional harmonic meter, a network power meter designed for power monitoring needs in power systems, industrial and mining enterprises, public facilities, and intelligent buildings. It can measure all conventional power parameters, such as three-phase voltage, current, active power, reactive power, power factor, frequency, active energy, reactive energy, and can monitor the 2nd to 31st harmonic components of voltage and current, among other electrical parameters. Furthermore, this meter has 4 opto-isolated switch input contacts and 2 relay control output contacts, which can be used in conjunction with intelligent circuit breakers to achieve remote signaling and remote control operation of the circuit breakers. This series of network power meters is mainly used in substation automation, distribution network automation, community power monitoring, industrial automation, energy management systems, and intelligent buildings.
The important outgoing circuits use ACR220EFLK series network power meters, which mainly measure three-phase current, three-phase voltage, active energy, multi-tariff energy, and detect switch signals and relay remote control output.
Figure 1 shows the real-time view of the high-voltage side, which is the main monitoring screen of the system. It mainly monitors the operating status of the high-voltage circuit in real time. Red represents closed circuit and green represents open circuit.
Figure 1. Primary Diagram of High Voltage System
The low-voltage power distribution system of the VIP Living Hall in the Expo Village is shown in Figure 2. Its functions include: remote power measurement, which mainly monitors the electrical parameters of the operating equipment, including: incoming three-phase voltage, current, power, power factor, energy, frequency and other electrical parameters, as well as the three-phase current of the outgoing circuits; remote signaling function, which displays the operating status of the field equipment, mainly including: the opening and closing status of switches and communication fault alarms; and remote meter reading function, which mainly completes the remote centralized meter reading of each major circuit, and can select the time period for querying (see Figure 3).
Figure 2 Low-voltage power distribution system diagram of the VIP Living Hall in Expo Village
Figure 3 Remote meter reading
The power consumption report function allows users to query the power consumption of each circuit according to a time period, as shown in Figure 4.
Figure 4 Electricity Report
The event logging function allows for real-time viewing of event logs and alarms, as shown in Figure 5.
Figure 5 Event Log
The system communication structure diagram allows you to view the communication operation status of each device in the system in real time, as shown in Figure 6.
Figure 6 System Communication
The load curve provides a visual overview of the circuit's load operation, as shown in Figure 7.
Figure 7 Load Curve
4. Conclusion
With social development and the widespread application of electricity, power management has become an inevitable choice for large public buildings. This article introduces the application of power meters and the ACREL3000 power management system in the VIP Living Hall of Block A in the World Expo Village. This system enables sub-item and time-of-use multi-rate metering of electricity, displaying not only the status of electricity consumption but also network communication capabilities, allowing it to integrate with computers to form a power monitoring and management system. The system analyzes and processes the collected data, generating various power reports, analysis curves, and graphs, facilitating remote meter reading, analysis, and research. This series of power meters and the system operate reliably and stably, providing statistical data on building power consumption and a basis for energy conservation decisions, achieving significant social benefits.
References:
[1] Ren Zhicheng, Zhou Zhong. Principles and Application Guide of Digital Instruments for Power Measurement [M]. Beijing: China Electric Power Press. 2007. 4
About the author:
Wang Xiaoming (1982–), male, Han nationality, Bachelor's degree, Engineer, major research direction is intelligent building power supply and distribution monitoring system.
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