Zhuozhou Suning Plaza is mainly divided into commercial, residential and apartment complexes. Shops are nine floors, two underground floors, one underground supermarket, one underground parking lot, and seven floors above ground shops. Suning Plaza will create a pedestrian street in the true sense of Zhangzhou. Suning Plaza symbolizes the future of landmark buildings in Zhangzhou and new things in the heart of the city.
This project is a remote prepaid energy management system for Suning Square in Zhangzhou. According to the requirements for pre-paid electricity sales, pre-paid energy management needs to be performed on the 7-floor commercial distribution floor circuit in Suning Plaza in Zhangzhou to ensure that electricity is charged first.
1, system structure description
The monitoring system mainly implements the 0.4kV power distribution system on the Suning Plaza floor in Zhangzhou to conduct toll management and energy efficiency assessment; the monitoring scope is 257 DTSY1352 pre-paid metering meters on the floor, three acquisition boxes are set, and the instrument is collected and analyzed by the collection box after the serial port server. Through the optical fiber network and background communication, the data communication between the instrument and the monitoring host on the bus is finally realized, and the system functions of energy efficiency management and charge management are completed.
The monitoring system adopts a hierarchical distributed structure, namely station control layer, communication layer and bay layer;
As shown in Figure 1:
Interval equipment layer is mainly: multi-function network power meter and prepaid multi-function electricity 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 all adopt RS485 interface and MODBUS-RTU communication protocol. RS485 adopts shielded wire transmission. Generally, two wires are used to connect the wires. The connection is simple and convenient. The communication interface is half-duplex communication, that is, both parties can receive and send data. Only data can be sent or received at the same time. The maximum data transmission 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, the main function of remote prepaid power management
The entire system software design is divided into three large blocks, which are a centralized meter reading service system, a remote prepaid energy management system, and a user query system.
The centralized meter reading service program runs all year round, and remote meter readings are performed on all tables at regular intervals. The remote prepaid system includes all functions for account opening, electricity sales, remote control, and reporting. The user query system is used for shops to check personal information, recharge and use electricity. In addition, the mobile phone terminal can also be configured to inquire about personal information, recharging, remote control, and daily power consumption on the mobile website terminal. If the conditions are met, users can also use Alipay, UnionPay, and other remote self-help methods. Purchase electricity.
The main features are as follows:
1. Quick configuration, ready to use: The meter and communication management machine configuration can be used to import the system;
2. Remote centralized meter reading: eliminating the need for manual meter reading, the maximum real-time meter status can be accurate to within 3 minutes;
3. Support single price, multi-rate, and ladder price: The price, rate and ladder price can be set separately for each meter;
4. Remote electricity sales: Financial centralized management, electricity delivery in real time, and comparing the number of recharge to prevent cheating;
5. Data security: The network data transmission adopts financial 3DES encryption algorithm to prevent data from being cheated and steal.
6. Mobile phone text message reminder: When the amount is insufficient or the amount is in arrears, a total of three levels of early warning can be notified by SMS in time;
7. Remote control: A remote control operation such as remote power-up or power-saving can be performed on any meter to facilitate management;
8. Energy analysis and query: Users and administrators can query daily energy consumption status of prepaid meters or various types of connected meters.
9. Personal mobile phone search website: Support mobile phone users to purchase electricity independently and make self-inquiry.
The traditional IC card prepaid electricity sales management system implements the management mode of paying electricity before payment. However, since the meter data is relied on the electricity purchase card, the user electricity data lags behind the occurrence time, and not only the manual meter reading but also the Effective power management, monitoring and real-time control.
The use of remote prepaid energy management system, without IC card, can realize remote centralized meter reading, real-time monitoring, remote recharging and remote control of the computer, and then through the warning information and SMS notification, as well as the mobile website, the property management department can complete the entire meter reading , Fees, control and verification work, to achieve a high degree of information and automation, greatly improve the efficiency and level of electricity marketing management, save manpower and material resources, but also improve the economic benefits, but also has anti-electricity information leakage protection features.
3, case analysis
Luzhou Suning Square remote pre-paid energy management system charges and collects fees for floor distribution boxes, and implements pre-paid energy management for the commercial part of the floor, which can be remotely implemented.
The distribution box uses ADF300 series multi-loop prepaid metering meters. The meter measures all conventional power parameters such as: three-phase voltage, current, active power, power factor, frequency, active power, remaining power, and remaining amount.
4. The site has achieved the following functions:
Centralized meter reading service system
The centralized meter reading service program consists of three major modules. In addition to centralized remote meter reading for all instruments at regular intervals, it also integrates an alarm message sending service. Shop users, this feature needs to be used with hardware SMS cats.
By default, the system performs remote centralized meter reading for all tables for half an hour. The interval supports personalized configuration.
The system is divided into five modules, namely the operator login module, the system configuration module, the user (shop) management module, the power sales management module, the report center module. The general operation and operation flow of the system are as follows:
The system's opening of accounts for shops not only supports one household and one table, but also supports the need for one household to hang multiple tables. At the same time, it supports and solves the problem of old table amount transfer when the old and new tables are switched after the project is transformed; Table 1 Electricity prices; the power overload threshold can be set for a single table and the two-level threshold for single table amount alarms can also be set.
In the batch remote operation scenario, the system provides multiple functions, with different colors for account opening, alarm 1, alarm 2, arrears, no account opening, and missing status; and supports remote control of the instrument remotely, remote command type as follows:
1. Delivery of electricity price; 2. Setting of delivery (announcement of alarm threshold and overload threshold); 3. Protection of electricity (forced meter closing); 4. Recovery of prepayment (automatic payment of arrears); Pull the brake (forced power off); 6. Meter reading export (export all current table status is EXCEL)
Sale of electricity
The system will also connect the energy metering instrument to the system for remote centralized meter reading and provide an auxiliary energy consumption query report, providing a strong basis for energy consumption analysis, energy use comparison, and safe electricity use. This function is used to replace the functions of some energy analysis and management systems. If professional energy analysis and management are required, an Acrel 5000 energy consumption system needs to be additionally configured.
The system also provides multiple reports for inquiries, namely, date/month/year financial sales statistics report, loss of list/communications management machine query report, energy consumption query report, real-time alarm/history alarm query report, and support for export. The following is a daily report of the financial statements and prepaid schedules:
Login interface
The system can customize the personalized system login interface according to user requirements.
When selling electricity, retreating electricity, and opening an account, the system supports the function of triple-sheet printing. The default format of the document is as follows, and can be freely customized by the customer after confirmation.
5. Concluding remarks
With the progress of social production, while the power consumption of commercial users is increasing, and the demand for power quality is constantly increasing, there are also a large number of arrears in electricity charges, which greatly aggravates the operational risks of power supply companies. In order to increase the tariff collection rate of electricity supply companies and avoid the economic losses caused by malicious arrears, our company provides a complete set of prepaid solutions. The system not only can receive electricity charges in advance, but also realizes “pay first, then use electricityâ€, and can also target users. The different nature of electricity consumption can selectively limit electricity when the electricity supply is tight or in response to the government's call for “energy saving and emission reductionâ€. On-site remote pre-paid systems enabled the use of electricity after the first payment, which can avoid the problem of the property company's electricity fee replenishment, thereby alleviating the financial pressure of the business just put into operation. In addition, the owner and the power distribution area are isolated, preventing private Solve the problem of stealing electricity.
Reference standard:
ISO/IEC11801 International Integrated Cabling Standard
GB/50198 "Monitoring System Engineering Technical Specifications"
GB50052-2009 "Design Specification for Power Supply and Distribution System"
GB50054-2011 "Low Voltage Distribution Design Code"
IEC 61587 "Electronic Equipment Mechanical Structure Series"
DL/T448-2000 "Technical Management Regulations for Electric Energy Metering Devices"
DL/T 698.1-2009 Part 1: General Rules
DL/T 698.2-2010 Part 2: Master Specifications
DL/T 698.31-2010 "Section 3.1: Technical specifications for energy information collection terminals - General requirements"
DL/T/814-2002 "Functional Specifications for Distribution Automation Systems"
DL/T5137-2001 Technical Specification for Design of Electrical Measurement and Energy Metering Devices
GB2887 "Technical Conditions for Computing Station Sites"
GB/T18460.3 "IC card prepaid electricity sales system Part 3: Prepaid meter"
About the author: He Meifang, female, Ankerui Electric Co., Ltd., the main research direction for the smart grid power distribution, Email: Contact: 021-69156950 QQ
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