Design and Application of Energy Management System in Suzhou Ouchasha Chinese Food City

An Kerui Cui Tingyu

Jiangsu Ankerui Electric Appliance Manufacturing Co., Ltd.

Abstract: This paper introduces the energy management system of Suzhou Ouchasha Zhonghua Food City. It uses smart power meters and prepaid meters to collect various electrical parameters and switch signals at the distribution site. The system adopts on-site local networking method. After networking, it communicates via the fieldbus and transmits it to the background. The Acrel-3000 power management system realizes pre-payment alarm, real-time monitoring and power management of the power distribution circuit.

Keywords: commercial and residential integration; Ouqisha Zhonghua Food City; floor; prepaid meter; Acrel-3000 type; power management system; sales management software

0 Overview

Europa Chinese Food City, a top 500 service company in China, is proudly established by the Europa Group. The project is located in the Vice Center of Yuexi City, the center of a million square meters shopping center, the center of a 5 million square meter community, close to the Xingang Road Station on Line 4 of the rail transit, west of Youxin Elevated Highway, south of the Ring Expressway, and north of Wuzhong. Avenue, the Suzhou-Jiahang-Hangzhou Expressway is within easy reach, 5 minutes north to Renmin Road and Unicom to Guanqian.

This project is Suzhou Ouqisha Chinese Food City Electric Energy Management System. According to the requirements of distribution system management, it is necessary to perform power management on the floor distribution box circuit of Suzhou Ouyuesha Chinese Food City, and to cooperate with the power selling system to charge shops to ensure the transparency, safety, reliability and high efficiency of electricity consumption.

Acrel-3000 low-voltage intelligent power distribution system makes full use of the latest developments in modern electronic technology, computer technology, network technology and field bus technology, and performs distributed data collection and centralized monitoring and management of the power distribution system. The secondary equipment of the power distribution system is networked, and the field devices scattered on the floor are connected into an organic whole through the computer and communication network to realize the remote monitoring and centralized management of the power grid operation and to assist the pre-paid electricity sales management.

1 System Structure Description

The monitoring system mainly realizes the power monitoring and prepayment management of the 0.4kV floor distribution system of China Food City, with a monitoring range of 52 DTSY1352-C floors, 602 DDSY1352-C, 35 PZ96, and 17 PZ72. A total of 38 buses are connected to three serial servers respectively. The main building is set up with background monitoring and charge management. The two auxiliary buildings are connected to the back office via fiber-optic communication through the local networking of the collection box.

The monitoring system adopts a hierarchical distributed structure, namely station control layer, communication layer and bay layer;

As shown in (1), (2), (3):

Figure (1) Network topology

Figure (2) Network topology

Figure (3) Network topology

Interval device layer is mainly: multi-function network power meter. These devices are corresponding to the corresponding primary equipment installed in the electrical cabinet, these devices are used RS485 communication interface, through the on-site MODBUS bus network communication, data acquisition on the spot.

The main network communication layer is: a communication server. The main function of the communication server is to collect the scattered data at the site collection device, and transmit it to the station control layer at the same time, to complete the data exchange between the field layer and the station control layer.

Station control management: equipped with high-performance industrial computers, monitors, UPS power supplies, printers and other equipment. The monitoring system is installed on the computer to collect and display the operating status of the field equipment and display it to the user in the form of human-computer interaction.

The above network instruments use RS485 interface and MODBUS-

RTU communication protocol, RS485 uses shielded cable transmission, generally use two connections, the connection is simple and convenient; the communication interface is half-duplex communication that both parties can receive and send data, but can only send or receive data at the same time. The maximum data transfer rate is 10Mbps.

The RS485 interface is a combination of balanced drivers and differential receivers. It has enhanced noise immunity and allows up to 32 devices to be connected on the bus. The maximum transmission distance is 1.2 km.

2 main functions of the power management system

2.1 Data Acquisition and Processing

Data acquisition is the basis of power distribution monitoring. Data collection is mainly accomplished by the underlying multi-function network instrumentation, realizing local real-time display of remote data. The signals that need to be collected include: three-phase voltage U, three-phase current I, frequency Hz, power P, power factor COSφ, power Epi, and remote device operating status.

The data processing mainly displays the electrical parameters collected according to requirements in real time and accurately to the user, so as to meet the requirements of automation and intelligence of the power distribution monitoring, and store the collected data in the database for user query.

2.2 Human-computer interaction

The system provides simple, easy to use, and good user interface. Using the Chinese interface, the CAD graphic shows the electrical main wiring diagram of the low voltage distribution system, shows the status of the distribution system equipment and the corresponding real-time operating parameters, the screen timing switching tour; dynamic refresh of the screen real-time; analog display; switch display; continuous Record display and so on.

2.3 Historical events

The historical event viewing interface provides convenient and friendly human-computer interaction for the user to view fault records, signal records, operation records, and over-limit records that have occurred. You can view the platform through historical events. You can easily locate your own according to your requirements and query conditions. The historical events that you want to view provide you with good software support for the overall system operation.

2.4 Database Establishment and Query

It mainly completes the remote measurement and remote signal acquisition, and establishes a database to generate reports regularly for users to query and print.

2.5 User Rights Management

For different levels of users, different permission groups are set to prevent the losses caused by human misoperation to production and life, and to realize the safe and reliable operation of the distribution system. You can use user management to perform user login, user logout, password change, and add/delete operations to facilitate user modification of accounts and permissions.

2.6 Remote Report Query

The main function of the report management program is to design the report style according to the needs of the user, and the data processed in the system is filtered, combined and statistically generated to generate the report data required by the user. This program can also be based on the needs of users of the report file to save, print or summon save, print mode. At the same time, this program also provides users with management functions for generated report files.

The report has the functions of freely setting the query time to realize daily, monthly, and annual energy statistics, data export, and report printing.

3 Power selling software function

1 Login Management: Mainly manage the operation of login system, including operator management, modify operator password, and authority management.

2 system settings: System-related parameter maintenance management.

3 customer management: including new forms of accounts, changing tables and make up electricity, transfer processing, cancellation of customer information and so on.

4 IC card operations: Including card reading, clearing cards, selling electricity to write cards, and making various kinds of parameter cards.

5 data query: various types of detailed reports, statistical reports, general queries.

6 Data Management: System Database Backup, Database Management

4 Case Studies

Suzhou Ouqisha Zhonghua Food City Electric Power Management System is the management of the floor distribution box. This project aims at the 0.4kV distribution of this floor and distribution box, as well as the power management and sales recharging.

Each circuit adopts DTSY1352-C and DDSY1352-C series network power meters. The meter mainly measures all conventional power parameters such as: three-phase voltage, current, active power, reactive power, power factor, frequency, active power, and reactive power. Electricity, remaining power, table number. The rest of the public measurement section uses the PZ series multi-function electric meter for energy metering and management.

The secondary diagram of low-voltage power distribution is shown in Figure (4) and Figure (5). The function has the power of telemetry to mainly monitor the electrical parameters of the operating equipment, including: line three-phase voltage, current, power, power factor, energy, frequency and other electrical parameters. And the three-phase current of the circuit; the remote signal function is used to display the operating status of the field device, mainly including: the switching and closing operation state of the switch and the communication failure alarm; when the circuit breaker is dislocated, an alarm signal is issued to remind the user to deal with the problem in time. Fault; remaining battery display and alarm.

Figure (4) Prepayment management diagram

Figure (5) secondary diagram of low voltage distribution

The remote signaling and telemetry alarm functions mainly complete the monitoring of the switching operation status and load incoming line of the low-voltage outlet loops, and indicate the specific alarm position and audible alarm to the switch displacement and load over-limit pop-up alarm interface to remind the on-duty personnel to deal with it in time. The load limit can be set freely under the corresponding authority. With history query function. See Figure (6).

Figure (6) Real-time remote alarm information

The parameter reading function mainly inquires into the electrical parameters of the low-voltage outlet circuit. Supports electrical parameter query at any time, with functions such as data export and report printing. The report queries the parameters for all meters, mainly including: three-phase current, active power and active power, and transformer temperature. The names of the loops in this report are associated with the database to facilitate the user to modify the loop name. See Figure (7).

Figure (7) Parameter reading

The electricity consumption report function can select the time period to inquire, supports the accumulated electricity inquiry at any time, and has the functions of data export and report printing. Provide accurate and reliable power report for duty personnel. The names of the loops in this report are associated with the database to facilitate the user to modify the loop name. As shown in the figure below, the precise power consumption of each distribution circuit in a certain period of time can be displayed. The user can directly print the report and can save it in EXCEL format to another location. See Figure (8).

Figure (8) Energy Report

The schematic diagram of the system communication structure mainly shows the networking structure of the system. The system adopts a hierarchical distributed structure and simultaneously monitors the communication status of the equipment at the bay level. Red indicates normal communication and green indicates communication failure. See figure (9).

Figure (9) System Communication Structure

5 Concluding remarks

With the development of society and the wide application of electricity, the power monitoring system has become an inevitable choice for large-scale multi-substation users, such as key construction projects, landmark buildings, and large-scale public facilities throughout the country. The Acrel-3000 energy management system introduced in this paper is introduced. The application of Suzhou Ouchensha Chinese Food City can achieve real-time monitoring and power management of floor distribution, and real-time alarms for pre-paid electricity sales to inform shops to pay in time, not only displaying the power status of the circuit, but also Network communication function can be combined with serial server, computer and other components to form a power monitoring system. The system analyzes and processes the collected data, displays the running status of each distribution circuit in the substation in real time, has a pop-up alarm dialog box and voice prompts for the closing and closing of the load, and generates various energy reports and analysis curves. Graphics, etc., to facilitate remote meter reading and analysis, research. The system is safe, reliable and stable. It provides real and reliable basis for users of substations to solve electricity problems and has achieved good social benefits. [2]

references:

[1]. Ren Cheng, Zhou Zhongzhong. Principles and Application Guide for Digital Meters for Electric Power Measurement [M]. Beijing. China Electric Power Press, 2007. 4

[2].Zhou Zhouzhong, et al. Product Selection and Solution for Smart Grid User-end Power Monitoring and Power Management System[M]. Beijing. Machinery Industry Press. 2011.10

About the author: Cui Tingyu, male, undergraduate, Jiangsu Ankerui Electric Manufacturing Co., Ltd., the main research direction for intelligent building power supply and distribution monitoring system. Email:el.cn QQ Mobile Phone Fax Website: http://