Design and Application of Remote Prepayment Energy Management System of Suning Square in Ganzhou
Zhuozhou Suning Plaza is a comprehensive complex that integrates commercial, residential, and apartment areas. The shopping area spans nine floors, with two underground levels, including a supermarket and parking lot, while the seven above-ground floors are dedicated to retail shops. This project aims to create a true pedestrian street in Zhangzhou, becoming a landmark of the city's future and symbolizing new developments in its urban core.
This project involves a remote prepayment energy management system for Suning Square in Zhangzhou. It requires pre-paid energy management on the 7th floor of the commercial distribution system to ensure electricity is charged before use.
1. System Structure Description
The monitoring system focuses on the 0.4kV power distribution system on the Suning Plaza floor in Zhangzhou, managing tolls and assessing energy efficiency. It covers 257 DTSY1352 prepayment meters, with three acquisition boxes set up for data collection and analysis via serial port servers. Through fiber-optic networks and background communication, the system completes energy efficiency and charge management by enabling data exchange between the instruments and the monitoring host.
The system adopts a hierarchical distributed structure: station control layer, communication layer, and bay layer.
As shown in Figure 1:
[Image: Diagram of the system architecture]
The interval equipment layer mainly consists of multi-function network power meters and prepaid multi-function electricity meters. These devices are installed in electrical cabinets and communicate via RS485 interfaces through a MODBUS bus network for local data acquisition.
The communication layer primarily includes a communication server, which collects scattered field data and transmits it to the station control layer, facilitating data exchange between the field and station control layers.
The station control layer is equipped with high-performance industrial computers, monitors, UPS power supplies, and printers. The monitoring system runs on the computer, collecting and displaying the status of field equipment, providing users with an interactive interface.
All network instruments use RS485 interfaces and MODBUS-RTU communication protocols. RS485 uses shielded cables, typically with two wires for connection, offering simple and convenient installation. It supports half-duplex communication, allowing data to be sent or received at any time, with a maximum transmission rate of 10 Mbps. The RS485 interface combines balanced drivers and differential receivers, enhancing noise immunity and supporting up to 32 devices on the bus with a maximum transmission distance of 1.2 km.
2. Main Functions of Remote Prepaid Power Management
The system software is divided into three main parts: a centralized meter reading service system, a remote prepayment energy management system, and a user query system.
The centralized meter reading service runs continuously, performing remote meter readings at regular intervals. The remote prepayment system includes account opening, electricity sales, remote control, and reporting functions. The user query system allows shops to check personal information, recharge, and monitor their electricity usage. Mobile terminals can also be configured for inquiries, recharging, and remote control via mobile websites. If conditions permit, users can also purchase electricity through Alipay, UnionPay, and other online methods.
Key features include:
1. Quick configuration and ready-to-use: Meter and communication management machine configurations can be imported directly.
2. Remote centralized meter reading: Eliminates manual meter reading, achieving real-time updates within 3 minutes.
3. Support for single price, multi-rate, and tiered pricing: Prices, rates, and tiers can be set separately for each meter.
4. Remote electricity sales: Centralized financial management with real-time delivery and comparison of recharges to prevent fraud.
5. Data security: Financial 3DES encryption ensures secure data transmission and prevents tampering or theft.
6. SMS reminders: Three levels of alerts notify users when balances are low or in arrears.
7. Remote control: Enable remote power-up or power-saving operations on any meter for efficient management.
8. Energy analysis and query: Users and administrators can access daily energy consumption data from prepayment meters.
9. Mobile website support: Allow users to independently purchase electricity and perform self-inquiries.
Traditional IC card-based prepaid systems rely on physical cards, leading to delayed data and inefficiencies in power management and real-time control. In contrast, the remote prepayment system enables centralized meter reading, real-time monitoring, remote recharging, and control via computers. Combined with SMS notifications and mobile websites, property management can complete meter reading, billing, control, and verification efficiently, significantly improving automation and reducing labor costs while enhancing economic benefits and protecting against data leaks.
3. Case Analysis
The Luzhou Suning Square remote prepayment energy management system manages charges and fees for floor distribution boxes, implementing prepayment energy management for the commercial area remotely. The distribution box uses ADF300 series multi-loop prepayment meters, measuring parameters such as three-phase voltage, current, active power, power factor, frequency, and remaining power.
4. Site Achievements
Centralized Meter Reading Service System
The centralized meter reading service consists of three major modules. It not only performs remote meter reading at regular intervals but also integrates alarm message sending services, requiring hardware SMS cats for shop users.
By default, the system reads all meters every half hour, with customizable intervals. The system is divided into five modules: operator login, system configuration, user (shop) management, power sales management, and report center. The general operation flow is as follows.
[Image: System interface layout]
The system supports one household per meter or multiple meters per household, solving issues with old meter balance transfers during upgrades. It also allows setting electricity prices and thresholds for overload and alarms.
[Image: Configuration screen]
In batch remote operations, the system provides color-coded statuses for account opening, alarms, arrears, and more. It supports remote commands such as electricity price delivery, threshold setting, protection, recovery, braking, and meter reading export.
[Image: Remote control options]
Electricity Sales
The system connects energy meters to the system for remote centralized meter reading and provides auxiliary energy consumption reports, aiding in energy analysis and safe electricity use. This function replaces some energy management systems, though specialized systems like Acrel 5000 may still be needed.
[Image: Reports overview]
The system offers multiple reports, including financial sales statistics, loss lists, energy consumption queries, and alarm history, with export support. Here is a sample of the daily financial report and prepayment schedule.
[Image: Daily report]
Login Interface
The system can customize the login interface according to user preferences.
[Image: Login screen]
When selling, refunding, or opening accounts, the system supports triple-sheet printing, with customizable formats after confirmation.
5. Conclusion
With increasing power consumption and demand for quality, commercial users often face significant electricity arrears, increasing operational risks for power companies. To improve tariff collection and avoid losses from malicious arrears, our company provides a comprehensive prepayment solution. The system enables "pay first, use later" and allows selective power limitation based on user needs, especially during tight supply or in response to energy-saving policies. Remote prepayment systems allow immediate electricity use after payment, avoiding property company fee replenishment and easing financial pressure for new businesses. Additionally, isolation between owners and power distribution areas prevents unauthorized electricity theft.
Reference Standards:
ISO/IEC11801 International Integrated Cabling Standard
GB/50198 "Technical Specifications for Monitoring Systems"
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., research direction: smart grid power distribution. Email: Contact: 021-69156950 QQ
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