The street lamp system is an integral part of the urban infrastructure and is a municipal public facility closely related to people's daily lives. At the same time, green lighting is an inevitable trend in today's lighting industry. With the acceleration of urbanization and the expansion of the size and quantity of cities, China's increasingly tight energy supply has been aggravated. Therefore, the street lamp energy-saving monitoring system is established to realize centralized control, detection and management of street lamps, and combined with the corresponding control network to ensure that each street lamp is illuminated on time and on demand, which can effectively save electricity for street lamps, prolong lamp life and reduce maintenance. Cost is the goal of a modern energy-efficient society.
The application of remote monitoring technology to the field of urban road lighting began in the 1990s. In developed countries, the application of streetlight remote monitoring system has been very common, and all of them have realized automatic monitoring of computers. With the support of today's advanced computer and communication technologies, city managers can use computers to centrally manage and monitor the city's streetlight systems, thereby enabling remote computerized monitoring and management of street lighting facilities. To achieve the goal of energy saving, and to allow the system to operate automatically and reliably in the absence of people, it can be seen that the development direction of urban street lighting monitoring system is to combine intelligent monitoring management technology, electronic communication technology and computer control technology. This kind of system can effectively improve the efficiency and service quality of street lamp management, and has important application value and significance. The street lamp monitoring system is an important part of urban construction, ensuring that the city street lights are in good condition, which is not only related to people's life, production development, traffic safety and social security, but also plays an important role in providing a good investment environment and promoting economic development. effect.
1 Monitoring system In this paper, based on the analysis of ZigBee wireless transmission technology and GPRS wireless transmission technology, the intelligent street lamp control system based on ZigBee wireless transmission technology is designed to realize the real-time monitoring of street lamps. And management to ensure efficient and stable operation around the clock. The design of the street lamp monitoring system network system, such as 1.1 main control system street lamp control system, the main components: monitoring center server, main control box, field control terminal. The monitoring center server only communicates with the main control box, and the two communicate through the GPRS mode; the field control terminal also communicates only in the main control box, and the two communicate through the ZigBee mode. The main control box is the intermediate node of the monitoring center server and the field control terminal. The monitoring center server controls all the street lights through the main control box.
Communication, a global mobile communication system) based on the development of mobile packet data services. Compared with the circuit-switched data transmission method adopted by the GSM communication system, GPRS adopts packet switching technology. By introducing a functional entity of packet switching in the GSM digital mobile communication network, GPRS can implement data transmission in a packet manner. Due to the use of "grouping" technology, users can avoid the trouble of dropping the Internet. The biggest advantage of GPRS is the fast data transmission speed. At present, the data transmission speed of the GSM mobile communication network is 9. 6 Kbytes per second, and the data transmission speed of the launched GPRS mobile phone has reached 115 Kbytes per second. In addition to its advantages in speed, GPRS also has the characteristics of real-time online, that is, users can keep in touch with the network at any time.
As the central control room of the urban street lighting remote monitoring system, the monitoring center contains the software and hardware systems of the monitoring center, which is the “superstructure†of the system, which indicates the level of intelligence of the system. The main task is to organize all kinds of relevant information transmitted by the main control box to facilitate management and to send relevant control commands of the management personnel to the main control box. Its hardware components are: computer, GPRS communication module, projector, printer, router, server and Internet access equipment.
Its software consists of: Windows monitoring system running platform, database and related application software.
For the system software control interface.
The role of the main control box in the street lamp monitoring system is to upload and act as a bridge. It mainly includes: GPRS communication module, main module, switching module, transfer switch, voltage detection board and other parts. The main work of the software department system software control interface is the receiving and sending of signals; the main work of the hardware part is the transmission of control commands and the collection and transmission of information. Due to distance or some interference limitations, the signal cannot be reached when it is sent to the target single-lamp controller, and it needs to be combined with ZigBee technology.
ZigBee technology is an emerging short-range, low-rate wireless network technology, mainly used for short-range wireless connections. The ZigBee network supports three topologies: star network, cluster tree network and mesh network. The mesh network is a highly reliable AdHoc network. Unlike the cluster tree network, nodes with routing functions can communicate with each other, so that the mesh network can provide multiple data paths through the functions of self-organization and wireless lines. When the optimal path fails, the redundant other paths provide the corresponding paths. Therefore, the mesh structure shortens the delay of information transmission and improves the reliability of the communication network.
Based on the above situation, this design fully applies ZigBee technology to street lamp monitoring, and better transmits control commands to the single-lamp controller through ZigBee technology and enables the main control box to receive the information collected in the single-lamp controller in time. .
The system can realize the following functions: by analyzing the latitude and longitude of the geographical location, and using the global positioning system and computer technology to achieve accurate calibration of the system, generating a year-round switch light schedule, and realizing the time control scheme. For special smog and other weather, the photosensitive induction control kinetic energy automatically runs, automatically discriminates the intensity of the light, thereby automatically adjusting the on/off time of the day to realize the light control scheme. The system can divide the street lamp and the landscape lamp into several groups according to different types of street lamp control requirements, respectively adopting a time control scheme or a control scheme combining time control and light control, and automatically remotely turning on/off the night light, the midnight light and Landscape lights; you can also manually turn on/off the night light, midnight light and landscape light; in special cases, you can turn on the day and turn off the lights at night.
The automatic patrol, manual patrol and optional test can automatically perform the timed patrol according to the different cycles before and after the on/off lamp. The operator can also manually patrol and select the operation of each field control terminal at any time.
When the on-site control terminal encounters an abnormal situation, it will report to the monitoring center server through the main control box, and the server will automatically respond to these abnormal situations. The alarm content includes: daylighting, abnormal lighting, power failure, communication failure, overcurrent, cable security, etc.
The monitoring center server analyzes and displays the arbitrary timing data and the annual, monthly and daily statistical data of the field control terminal, and the displayed data can be printed.
1.2 Single-lamp control system In response to the call for energy conservation and environmental protection, street lighting monitoring systems also need to adopt new technologies to achieve green lighting, improve management rate and reduce operating costs.
The single-lamp monitoring system installs the monitoring device in each street lamp and detects and controls the status of each street lamp through remote communication.
In this way, the status of each street lamp and the condition of the line can be detected, and problems such as street lamp failure, aging and disconnection can be found in time, and maintenance management can be facilitated, and the lighting can be dispersed while ensuring the lighting rate.
The single-lamp controller can directly realize the feedback of the street light switch control and the street light working condition information, and when the signal sent by the main control box cannot reach the target single-light controller, the single-lamp controller should perform the relay transmission of the signal, so that In order to ensure reliable transmission of signals. Conversely, when the operating status signal of the single lamp controller cannot be transmitted to the main control box, the relay of the signal is also transmitted through the other single lamp controller. The single-lamp controller consists of the following components: power line interface, current-voltage signal acquisition and conversion unit, status indication circuit, and serial communication circuit. Its software part mainly involves the relay transmission of signals and the collection of signals.
The system can implement flexible group control mode, and the user can perform various control modes by grouping the software, such as “clearingâ€
To control the switch lights of the specified lamps at any time.
2 Workflow When the terminal fails, it will report to the monitoring center. The staff on duty will immediately process the alarm and distribute the tasks and related responsibilities to the relevant staff. The staff will promptly handle the fault and feedback the repair result to the monitoring center, and confirm the fault that has been handled in time.
The specific workflow is as shown.
3 Summary The street light control system based on ZigBee and GPRS has been applied in engineering applications due to its simple installation, convenient networking and low maintenance cost. In the actual project, the street lamp energy-saving control system is realized (down to page 43). IAUDP protocol and UDP protocol performance comparison 3 Conclusion This paper proposes an improved UDP protocol IAUDP for industrial wireless sensor networks, which mainly improves the industrial site. The weak reliability of the transport protocol in an environment where the data is not continuous and the amount of data is unpredictable.
The basic principle of IAUDP is analyzed, and the confirmation retransmission mechanism is introduced to ensure the reliability of IAUDP transmission. The protocol header of IAUDP is only 3 bytes more than UDP. It is simple to control, easy to use, simple and flexible. This protocol has been tested in a wireless sensor network monitoring system, which reduces the burst error rate and data loss, ensures the successful arrival of data, and improves the reliability and efficiency of data transmission of the entire system.
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