Abstract:Accidents of electric vehicle charging causing fires occur from time to time across the country, posing a great threat to the safety of people's lives and property. The electric vehicle charging station charging platform introduced in this article adopts wireless communication technology, Internet of Things technology, and electrical fire detection and protection technology to monitor the status and charging process of electric vehicle charging stations, and timely warn and protect against a series of faults such as overvoltage, undervoltage, no-load, insulation detection faults, leakage, overheating, and short circuit of charging stations.

KeywordsElectric scooter charging station；school；hosting；cloudplatform

1 Project Overview

A certain college in Fujian University City is a provincial public college organized by the people of Fujian Province, covering an area of1388Mu, with13A secondary college and2A teaching department with a total of full-time teachers771People, full-time undergraduate students nearby1.5**.

The college aims to meet the needs of the campusgrow with each passing dayThe charging demand, at the same timeIn order to standardize the management of campus electric vehicles and avoid safety accidents such as disorderly parking and unauthorized charging, it is planned to install a batch of electric vehicles10Intelligent charging station for electric vehicles.

2 Project Requirements

Based on the audit requirements of universities, the school proposes to use the existing WeChat merchants of the school for payment collection, unified management of funds, and operation through a mini program. The system requirements mainly include:

Under the custody mode, it supports direct use of school affiliated merchants for payment collection

Under the hosting mode, it supports the use of the school's mini program for operation

Under the hosting mode, it supports configurable charging and recharging levels for mini programs

3 system architecture

On site adoption10Intelligent charging station for electric vehicles, which collects data from the charging circuit and usesRS485The interface communicates with the wireless communication terminal to achieve monitoring, warning, and protection of power parameters. The wireless communication terminal then uploads the data to the charging station charging platform built in the data center via Ethernet.

The platform is designed with a hierarchical distributed structure, and the detailed topology structure is as follows:

The system is divided into four layers: data collection layer, network transmission layer, data center layer, and client layer.

Data collection layer: The communication protocol of the intelligent charging station for electric vehicles is standardmodbus-rtuThe intelligent charging station for electric scooters is used to collect power parameters of the charging circuit, and perform energy metering and protection

Network transport layer: includes wireless communication terminals. The wireless communication terminal actively collects data from the data collection layer and uploads the data to the established database server through Ethernet.

Data center layer: includes application servers and data servers, with application servers deploying data collection servicesWEBDeploy real-time databases, historical databases, and basic databases on websites and data servers. The application server and data server are deployed within the local area network and isolated from the external network.

Client layer: The system administrator accesses the electric scooter charging station charging platform through the local area network in the browser. Terminal charging users start charging by swiping their cards.

4 System functions

4.1 home page

Display the geographical location, station information, and charging equipment status of the charging station, including charging in progress, idle, faulty, offline, etc. Collect operational and charging data of charging stations, including charging amount, charging degree, charging frequency, charging duration, and conduct trend analysis and comparison for today, yesterday, and this month.4.2 real-time monitoring

4.2.1Charging station monitoring

Display the current status and real-time charging data of each charging station and charging station, collect today's charging data of the station and each charging station, and support charging unit price, equipment restart, and charging/call the police/Remote batch distribution of protection and other parameters, with permission control for remote parameter settings. Unauthorized users are not allowed to operate, ensuring the normal operation of on-site equipment.

4.2.2Charging station monitoring

Display the status and charging data of each circuit of the charging station, collect today's charging data, order records, and fault information of the charging station, and view details of orders and faults.

4.3 Equipment Monitoring

Display the status of current limiting protectors, including residual current, temperature, and abnormal alarms in the circuitWhen a short circuit occurs in the circuit, it automatically150Cut off the circuit within microseconds, no dangerous sparks are generated, and it plays a role in short-circuit arc extinguishing.

4.4Transaction Management

4.4.1Account Management

Display the account information of all associated charging users, and perform operations such as recharging, *, freezing, unfreezing, and canceling.

4.4.2charging record

Display all order data, classify and query orders by charging station, charging station, payment method, transaction status, etc., and stop charging operations for charging stations in progress.

4.4.3transaction record

Display the transaction flow details of all orders, including prepaid, consumption, * and other types, WeChat, AlipayICPayment methods such as cards, wallets, and transaction amounts.

4.4.4Recharge record

Display wallet account recharge records, including WeChat, Alipay, cash and other payment methods, recharge amount and wallet balance, which can be printedRecharge amount receipt.

4.5 fault management

4.5.1faultquery

Display the fault information and processing progress of the charging station, including types of faults such as overvoltage, undervoltage, no-load, insulation detection faults, leakage, overheating, short circuit, etc.

4.5.2faultdistribute

4.5.3Fault handling

4.6 statistical analysis

4.6.1Operational Trends

You can view the number of charging times, charging duration, and charging amount by day, month, quarter, or year, and display the corresponding curve chart.

4.6.2Energy Consumption Analysis

You can view the electricity consumption of charging stations and charging piles during the * time period, display the corresponding energy consumption trend chart, and conduct a month on month analysis.

4.6.3Fault Analysis

You can view the number of faults, fault status, fault type, trend analysis, and fault list within the relevant time period.

4.6.4financial statements

You can view the financial data of associated sites based on time, including prepaid amount, consumption amount, * amount, recharge amount, account balance, etc., which can be exported asexcelTable.

4.6.5Revenue inquiry

You can view the total revenue statistics, revenue change curve chart, payment proportion pie chart, and actual revenue report.

4.6.6Energy Consumption Report

You can view the electricity consumption of each charging station by day, month, and year, and export it asexcelTable.

4.7 report analysis

You can view the operation status of the site based on the selected time and site, and display it in the form of a report, supporting export asPDFDocuments and printing.

4.8 ICcardmanagement

Charging stations can be paid and charged by swiping a cardC/SThe program performs operations such as opening, recharging, and refunding RF cards.

4.9 operationsAPP

Intended for operation and maintenance personnel, it can manage stations and charging stations, handle faults in a closed-loop manner, check the usage of data cards, and inquire about charging\\Recharge status, set remote parameters.

5 System application*

5.1 social benefits

Ø Charging**

Real time monitoring of the charging process, alerting for input and output overvoltage, undervoltage, insulation detection faults, leakage, overheating, short circuit and other faults of the charger, and sending SMS messagesAPPNotify relevant personnel in a timely manner through push notifications, mini programs, DingTalk, etc., to avoid problems such as overheating, fire, and circuit aging, and * * charging. At the same time, the circuit is cut off during a short circuit, and no dangerous sparks are generated, which plays a role in extinguishing the short circuit arc and preventing fire accidents in a timely manner.

Ø Solving the problem of difficult charging

Unified installation of charging equipment, end users only need to park the electric scooter in the charging area and follow the instructions to charge, achieving orderly charging for end users.

Ø Solving difficult management problems

Electric scooters are centrally parked and charged, making them easy to manage and better preventing theft,Solved the problem of unauthorized charging by users.

Ø environmentally friendly

By innovating power topology and designing electromagnetic shielding, we aim to reduce electromagnetic radiation and minimize its impact on electrical equipment and human health.

5.2 economic benefits

Ø advertising revenue

Charging stations can advertise commercially to increase additional revenue for businesses. Expected revenue per screen for a single advertisement1yuan/Oh my god. Mini programs can connect to WeChat Advertising Alliance, with average revenue40yuan/Oh my god.

Ø Charging price difference income

Usually, charging stations are charged based on charging time, and each device is charged based on1Yuan Chong4Calculated by hour, the power of a two wheeled electric vehicle is200WDuring the charging period, press200WCalculate, then4Hourly energy consumption0.88Kilowatt hour. If each kilowatt hour is0.6Yuan, then4Total consumption per hour0.88*0.6=0.528The profit for charging one yuan is1-0.528=0.472Yuan. Each charging station charges daily10Then, the daily revenue of each charging station is4.72Yuan, monthly income is141.6The annual income is1722.8Yuan.

Charging by power level, compared to charging by time, increases revenue30%-60%.1Gear:0-150W480minute/Yuan;2Gear:150-285W360minute/Yuan;3Gear:285-400W240minute/Yuan;4Gear:400-600W120minute/Yuan.

Ø Enjoy government subsidies

Various regions attach great importance to the centralized parking and charging of electric scooters, and have repeatedly issued various red headed documents. They attach great importance to the construction of such infrastructure, usually accompanied by subsidies for carport construction. Refer to the subsidy documents of Zhejiang Province100yuan/Point position.

Ø recoup funds

Withdraw funds through member recharge rebate activities.

6 Product Features

6.1 Intelligent charging station for electric vehiclesACX10A-YHW

● Carrying current: not exceeding2

● Each output current:not exceed3A

● Standby power:3W

● Protection level:IP65

● Can be charged simultaneously 10 An electric scooter.

● Large size and ample internal space.

● Physical button design, with a realistic touch and long service life.

● displayICCard swiping frequency,ICCard balance, voice broadcast of card balance.

● Each deduction and charging time can be adjusted, and multiple card swipes and QR codes can be used to automatically accumulate charging time.

● Charging function can be activated according to customer needs.

● You can use WeChat and Alipay to scan the code and charge by swiping the card.

● Automatically identify faulty lines, accompanied by letter and voice prompts.

● Equipped with power-off memory function, when there is a power outage, the remaining time can continue to be used for charging after an incoming call.

● It has a power-off function, which automatically shuts off the power when the user unplugs the charger.

● Equipped with a fully charged self stop function, it automatically detects the charging status of the electric scooter. If it is fully charged, the power supply will be stopped and the billing time will be reset to zero.

● Equipped with overload protection function, it can recognize high-power electrical appliances, automatically suspend power supply, and prevent users from privately connecting power strips to charge multiple electric scooters.

● Equipped with short-circuit protection function, when a short circuit occurs, the fuse will melt to ensure safety.

● Equipped with power grading function, charging is started according to the time set for different power levels based on the detected power.

Over temperature protection function, stops charging when the chassis temperature is detected to be too high

7 Conclusion

All levels and departments attach great importance to the hazards of electric vehicle charging causing fires,GB51348-2019Electrical Design Standards for Civil BuildingsIt is also stipulated that current limiting electrical fire protection devices should be installed in the end circuits of storage warehouses, electric vehicle charging and other places.AcrelCloud-9500The charging platform for electric vehicle charging piles will connect the discrete electric vehicle charging piles on site to the platform for centralized management, reducing management difficulty and facilitating user operation and maintenance. At the same time, through the safety monitoring and protection of the charging piles themselves, combined with current limiting protectors, it can timely and reasonably eliminate fire hazards during the charging process, making charging more reliable and reassuring, and effectively ensuring the safety of people's lives and property.

References

[1]Q/320281DGB57-2019Enterprise Standard for Intelligent Charging Station for Electric Vehicle of Jiangsu Ankerui Electric Appliance Manufacturing Co., Ltd

[2]GB51348-2019Electrical Design Standards for Civil Buildings

[3]Notice on Standardizing the Parking and Charging of Electric Vehicles and Strengthening Fire Prevention