1 system structure of the street lamp monitoring system
The system consists of three parts: the central control station master station system, the slave station measurement and control system, and the wireless communication network system.
1.1 Central Control Room Master Station System Structure
Dedicated data server; dedicated maintenance workstation: responsible for maintaining system parameters, managing operator privileges, etc.: multiple operating workstations, attendants and related functional staff can be used simultaneously; multiple redundant communication front-end machines to ensure the entire system The real-time and reliability of data communication; a GPS receives the satellite clock to ensure the accuracy of the entire system control time. An illuminance data acquisition machine that collects ambient light levels. And large screen display systems, sound equipment and related network equipment.
1.2 slave station measurement and control system structure
The slave station is installed in the on-site electrical control box. Including communication module, smart meter module, AC sampling module, latitude and longitude time and switch control module. The slave station measurement and control system can perform different configuration combinations according to the actual situation of the site, such as the number of lines, street lights and landscape lights.
1.3 wireless communication network structure
It mainly includes the digital radio station of the main station and its antenna feeder system, the digital radio station of the relay station and its antenna feeder system, the digital radio station of each slave station and its antenna feeder system, and the maintenance vehicle radio system to form a plurality of 1:N communication groups. .
How 2 street lighting monitoring systems work
This article uses a simple example to illustrate how the streetlight monitoring system controls the on/off state of the streetlights in a closed loop manner. When the monitoring center sends the first branch and the second branch turn-on command to the slave station, the slave station opens the AC contactor through the J1 contact after receiving the command. Since the system is in automatic mode, the independent switches of the two branches should be closed, and the street light is turned on. The slave station detects state information such as phase currents of the two branches, and forms a response frame to be sent to the monitoring center through the wireless network. The program of the monitoring center judges whether the street light has been turned on according to the current voltage change information contained in the received response frame. If it is determined that the street light is turned on, it sends an acknowledgement frame to the slave station, otherwise the system is considered to have failed. If the monitoring center does not receive the response frame, it considers that the communication failed and re-issues the light-on command.
The main function of the 3 street lighting monitoring system
3.1 remote control
The control center computer wirelessly controls the on/off of the street lights of each station according to the local standard switch light time and illuminance meter, or can be manually remotely controlled or directly set on the field. A proofreading command can be issued from the microcomputer or the master console to calibrate the internal real time clock of each slave station microcontroller system. You can also reset the time of switching lights every day. Each slave station's single-chip system has the actual switch light time of yesterday. If it is not reset, the slave station still performs the switch control of the street light according to the actual switch light time of yesterday when the master console is out of control.
3.2 Telemetry
Patrol or random detection of street light parameters such as voltage and current at each station. Randomly detecting the parameters of the slave street light line, only the monitoring center needs to send the corresponding command to the slave station. After receiving the command, the communication module that the slave station is listening to transmits the recently collected parameters to the master station, and the master station receives the command. The parameters are analyzed and stored, and the data is stored in the database as historical information of the site. The inspection is in the unsupervised time period, and the monitoring center continuously checks all the slave states that meet certain conditions in a certain order according to a preset time interval. The computer screen of the monitoring center can dynamically display the streetlight conditions and parameters of the most recently queried site.
3.3 remote letter
Acquisition of switch status and fault information at each site. Similar to the operating parameters of the station line, the switch status and fault information of the station can also be transmitted to the primary station in a similar manner. In order to detect street lamp faults in time, the slave station needs to be equipped with some specific sensors to monitor specific faults that are not necessarily reflected in the current voltage, such as street lamp pole tilt. The monitoring system can quickly issue an alarm when a fault occurs.
3.4 Management
The monitoring center's database contains site information such as site location, street lamp count, and historical data of site operations, which can be easily managed. The curve display is the basis for data statistics and analysis of system operation. For example, analyze various data of the startup process when the lamp is turned on, analyze whether there is a need for improvement and methods; analyze various data of the entire lighting time, and study ways to save energy and prolong the service life of the lamp.
4 Conclusion
The urban street lamp monitoring and management system based on wireless communication is the inevitable result of the development of modern computer centralized control technology and wireless transmission technology, and is the inevitable direction for the development of urban street lamp management system. The system involves the latest scientific research and technical research results in many fields such as computer technology, communication technology and automatic control technology, which is an important symbol of the degree of urban modernization. Its adoption and promotion can not only improve the management level and service quality of street lamps, but also generate large economic and social benefits in terms of energy conservation, environmental protection and public safety.
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