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I. Introduction
With the rapid development of society and economy, urban construction, especially infrastructure construction, has also been rapidly developed in various places, and local areas have also paid more and more attention to the construction of urban images. The construction of urban roads and landscape lighting systems has become an important part of displaying the image of the city. Therefore, it is bound to put forward higher requirements for municipal road lighting and landscape lighting, and it also represents a city’s economic development and modernization level.
The traditional lighting control method is usually for individual and decentralized control of street lights in a small area such as a road, a district, etc., by installing timing automatic control equipment in the street light distribution box, and controlling the street lights at a fixed time set every day Switches, and even some street lights require manual switch control. However, the monitoring of the on-off status and fault status of street lights can only be done through manual inspection. This control method cannot adjust the switching strategy of street lights in time according to actual needs. For example, the time of switching lights in different seasons is different, and the time of switching lights needs to be temporarily adjusted during various major festivals and major events, and if adjustments are required, it takes a lot of money. It is time-consuming and labor-intensive and error-prone. The running status of street lights cannot be monitored in time, failures cannot be discovered in time, and maintenance costs are extremely high.
With the development of wireless communication technology, especially the maturity of GPRS wireless communication technology, the use of GPRS to realize wireless remote control has been applied to various application fields in various industries, such as the temperature remote monitoring of refrigerated trucks and refrigerated containers in cold chain logistics. Remote monitoring of various environments, such as PM2.5, wind speed, water quality, water flow, etc., is also an extremely convenient means for remote control of municipal lighting and high-speed street lamp systems.
This article takes the remote control scheme of a municipal street lamp in Guangdong as an example to introduce the realization of the GPRS street lamp remote monitoring scheme.
Two, the system plan
1. Basic application scenarios
The plan is mainly aimed at upgrading the existing urban municipal street lamp control system, and uses GPRS wireless communication technology to realize the remote control of the municipal street lamp system.
Since the city has already built a large number of municipal street lights, for these existing street light systems, it is obviously not feasible to realize the remote street light control scheme through complete reconstruction, and it will cause great social waste. Only through the transformation and upgrading of the existing system and realizing the remote control of street lights at a relatively small transformation cost can better social benefits be achieved. The plan in this article is to upgrade the existing municipal street lamp system, integrate a GPRS wireless data communication module in the control electric box of each street lamp control point, and upgrade the electric box equipment to realize the entire municipal street lamp at a lower cost. Remote control realizes good social benefits.
2. System composition
The system mainly includes the following components:
(1) Monitoring Center Server (MCS)
The monitoring center server is a set of server software running on the hardware server of the street lamp monitoring center. The software needs to run continuously and stably for 7×24 hours, providing the function of monitoring all street lamp control equipment (distribution boxes), and receiving power distribution in real time. The equipment operating status data reported by the box, the development instructions for manual control or automatic control of street lights and other system maintenance instructions are issued in time, and the interface function of management and maintenance is provided for the maintenance of the client software.
The monitoring center server software also customizes the docking function with the customer’s existing information management system for customers, and reports the system data to the customer’s existing information management system in a timely manner, seamlessly connecting with the customer’s existing information management system, and making full use of the customer’s current information management system. There are resources.
(2) Remote monitoring and maintenance terminal (RMMC)
The remote monitoring and maintenance terminal is a set of software provided to operation management personnel for system maintenance and management. It provides users with functions such as street light distribution box equipment management and equipment status monitoring. The management and maintenance personnel can access any Internet network. Locally monitor the street lighting system.
(3) Street light controller distribution box
The controller is part of the function of the street light control system distribution box, which is used to specifically control one or more circuit street light systems. Each distribution box can control up to 32 circuits of street light systems. According to the existing functions of the distribution box, the software upgrade or partial transformation of the distribution box is required to complete the line control and status reporting lamp functions.
(4) RDT-G500 embedded GPRS DTU module (or RDT-G510, 511GPRS DTU terminal)
The module provides wireless network communication function through GPRS network, realizes real-time and remote upload of data to the monitoring center server, and provides network status monitoring and automatic reconnection functions to ensure the timeliness and accuracy of data upload. Integrate the data communication module with the distribution box, and work with the circuit control module of the distribution box to jointly complete the control of the street lights.
The basic structure of the system is as follows:
Composition diagram of street lamp remote monitoring system
3. System workflow
Integrate the GPRS wireless transmission module (DTU) into the street light controller power distribution box, and communicate through the UART (TTL, RS-232, RSA85) interface, through the GPRS DTU module, the monitoring center can send to the street light controller power distribution box Control instructions, the street light controller distribution box can also send the current line status and the results of the control instructions to the monitoring and control center.
The GPRS module in the distribution box maintains the communication connection with the monitoring center server, and timely transmits the data sent by the distribution box circuit control module. At the same time, it monitors the communication connection with the monitoring center server. If network communication is found to be abnormal, it will be initiated regularly (settable) Reconnect the request until the connection is successful.
The monitoring center server provides 7×24 hours of uninterrupted and stable operation, and timely receives and processes status data from the distribution box and saves it to the database system. It can save at least the latest 6 months of historical data, which is convenient for data information management and accidents. Backtracking query.
4. Maintenance and management
The system provides maintenance management client software to provide effective distribution box equipment management and monitoring and maintenance methods for management and maintenance personnel. The software adopts the C/S system structure and communicates with the monitoring center server through the TCP/IP protocol to ensure the real-time nature of maintenance operations. Management and maintenance of the client software must pass through the monitoring center server to perform system-related database operations and equipment real-time status query, etc. This can isolate the database system from the outside world and enhance the security of system data.
The software implements hierarchical authority management for administrator accounts. Different authority personnel only have the management and maintenance authority of corresponding distribution box equipment, and cannot view other users’ distribution box equipment. The upper-level account can be assigned to the lower-level account. At the same time, an encryption strategy is implemented for the login password of the account to ensure the security of the system account.
The software provides managers with functions such as adding, registering and modifying distribution box equipment information, automatic street light switch control scene settings, equipment location query, status monitoring and other functions.
Maintenance function diagram
Three, system function
1. Monitoring center server software
The main functions include:
(1) Service monitoring
After the monitoring center server software starts running, it starts the monitoring service on the designated (settable) server port, receives external connection requests including distribution boxes, maintenance clients, etc., and checks the validity of the connection request. The communication data adopts The private protocol immediately discards invalid and illegal data to avoid being attacked by invalid connections. At the same time, it will verify the legitimacy of the connection to the distribution box and maintain the client’s identity, and the illegal connection request will also not be processed.
The legally verified street light controller distribution box and maintenance client can normally send data to the server through the service monitoring port.
(2) Implementation of street lamp automatic switch strategy
According to the street lamp automatic switch strategy set by the system, the monitoring center server automatically sends the corresponding control instructions to the street lamp controller distribution box to control the automatic timing switch of the street lamp circuit (remote control: remotely control the switch of street lights and landscape lights; remote adjustment: remote Adjust the brightness of each lamp).
(3) Data collection
The monitoring center server software receives real-time data collected by the street light controller distribution box (remote measurement: remote measurement of the actual operating status of the street light distribution cabinet, with three-phase main circuit voltage and current measurement functions and current detection of six branches; remote signaling: remote monitoring Terminal status information, high voltage and current alarm information, contactor failure information, etc.; remote viewing: remote live video or photos).
(4) Data storage
The reported data is saved in the database in real time for query.
(5) Maintenance order processing
The maintenance client needs to connect to the monitoring center server to manage and maintain the system. The monitoring center server is responsible for providing maintenance interfaces such as account login, equipment management, automatic street lamp switch strategy settings, status monitoring, and data query for maintenance clients.
(2) Communication interface
The monitoring center server provides the software interface function with the third-party information system, and reports the collected data to the customer’s existing information system.
2. Maintain client software
The main functions include:
(1) User login
Provides the account login function for the administrator. The maintenance administrator must have a legal user name and password to log in and use the maintenance client normally. The system login interface is shown in the figure:
(2) Monitoring center server parameter settings
The IP address and service port number of the monitoring center server that the client software needs to connect to can be set, and the monitoring center server can be accessed through the domain name. The server parameter setting interface is shown in the figure:
(3) Account management
System accounts are divided into three levels of authority, system administrator, first-level user, and second-level user, with authority from high to low. Users with permission levels can assign accounts with low permissions. User hierarchical management makes it easy for customers to independently manage the equipment of subordinate units without interfering with each other. Maintenance personnel of subordinate units can only have the authority to view the relevant distribution box equipment in the area or road under their management.
The system provides the password modification function for the logged-in user.
(4) Distribution box equipment management
Different users can manage the distribution box equipment they are responsible for, and can add new registration and modify the necessary parameters of the distribution box, including: device number, device name, mobile phone number bound to the device, device location, etc.; provide “batch “Import equipment” function, can import multiple distribution box equipment information into the system database for registration at one time; query the online or offline status of the current distribution box equipment; query the location information of the current distribution box, etc. The main interface of device management is as follows:
The parameter configuration interface of the GPRS module of the distribution box is as follows:
(5) Street lamp automatic switch strategy (working scene) setting
You can set the work scenes of street lamp automatic switch according to your needs, such as setting different street lamp automatic switch strategies according to different seasons, important festivals, important events and other scenes. The implementation of the street lamp automatic switch strategy can be specific to a certain area or road. The street lamp work scene setting interface is as shown in the figure:
Work scene configuration interface:
Set the application area, section of the electric box or the specific circuit switch of the electric box for the work scene, and the work scene can be applied to a specific circuit switch.
(6) Remote upgrade of equipment software
Provide system administrators with the remote upgrade function of DTU device software in the distribution box, and support to upgrade all devices at once or upgrade a certain device individually.
4. System technical indicators
(1) Software technical indicators
Project name technical index description
Monitoring center server software system capacity 10,000 distribution box equipment
Stability 7×24 hours stable operation
Reported data processing time within 1 second
No limit on the number of maintenance terminals
Security communication data uses a private protocol, and does not support connection requests from invalid or illegal distribution boxes, maintenance clients or other systems
The client does not respond and automatically disconnects after timeout
Communication interface with third parties According to user needs, different data interfaces including TCP/IP, WebService, etc. can be provided
Database system The database system MySQL is a free database, and other database systems can be replaced according to customer requirements.
Data storage is not less than 6 months, which is related to hardware capacity.
Remote monitoring and maintenance terminal software security user login password using MD5 encryption
Account authority hierarchical management
Performance maintenance commands are sent to the monitoring center server in real time
Operability graphical operation interface, intuitive and easy to operate
Fourth, the benefits of using the system
1. Increase the lighting rate
After the system is put into operation, the problems in the operation of street lights can be found at any time, and they can be dealt with at any time to improve the lighting rate.
2. Save energy and reduce electricity expenses
After the system is put into use, in the case of sparse pedestrians and reduced traffic in the middle of the night, the lighting method of “one light every other” or “one light every two” can be implemented, which not only brings convenience to pedestrians traveling at night, but also saves a lot of money. Electricity expenses. After the single control is realized, the control by turning off the lights is generally realized by laying a two-wire cable, and now at least 50% of the cable cost and construction cost can be saved. This is very convenient for the transformation of the existing system, without the need to lay additional cables.
3. Extend lamp life
After adopting the energy-saving operation of the intelligent voltage regulation mode of the street lamp intelligent control terminal, the voltage of each lamp can be kept relatively stable, especially when the voltage rises in the second half of the night. According to tests, under normal voltage (220V), the voltage of the sodium lamp is 100V. After the voltage is increased (230V-240V), the voltage of the sodium lamp can be increased to 120V-150V; after the normal voltage environment is reduced, the voltage of the sodium lamp is generally 85V. , The voltage of the sodium lamp can be maintained at about 100V in an environment with increased voltage. From the theory and actual use environment, the use of voltage regulation control energy saving can prolong the service life of street lights. Therefore, the voltage regulation method has a double energy saving effect.
4. Save manpower and material resources and improve management
Because it can monitor the working status of each street lamp, each road section and lighting project in real time, the computer can summarize the faults in time and write them into the database for maintenance the next day; use dynamic real-time simulation display screens to monitor the city’s street lights and attendants In the central control room, you can have an overview of the on-site operation of street lights, thereby reducing the maintenance cost of the patrol lights and reducing the work intensity of the inspectors, greatly improving work efficiency. In addition, in severe weather, analyze the data collected by the intelligent terminal controlled by each street lamp, and take corresponding emergency measures to avoid major traffic accidents.
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