1 Remote monitoring refers to the remote monitoring and control of street lamps by computer through the Internet network system. Main realizations: (1) Telemetry: Realize the collection of data such as switch lamp status, voltage, current and power, and transmit the information to the monitoring center for analysis and processing. The real-time data of telemetry can be used as the original basis for adjusting the status of each monitoring point. (2) Remote control: Perform the opening and closing actions and adjust the parameter settings of the control terminal (such as the switch light time, alarm parameters, etc.). (3) Remote communication: The street light operation status of each section of the jurisdiction, the alarm information of the monitoring point (including over current, over voltage, abnormal switch, theft, etc.) will be timely and reliably transmitted back to the control center.
2 management system design and overall structure
2. 1 management system design
The management system is based on GPRS wireless communication technology, realizes remote switch control of street lamps through remote terminal equipment installed on site, and collects various power parameters and fault alarms in real time. The GPRS terminal module is connected to the back end of the monitoring terminal to get rid of the wired constraint.
2. 2 management system architecture
The street lamp management system consists of three parts: the terminal system, the communication system and the control management center, as shown. The terminal system consists of a single-chip microcomputer system, a power parameter acquisition module, and a digital input and output module. Through the control of the single-chip system, the power parameters, the switch quantity and the alarm information are transmitted remotely through the communication system, realizing the purpose of real-time monitoring. The communication system adopts GPRS communication network, which is the data transmission channel of the monitoring center and the terminal. The fixed IP address mode is selected, and the collected working parameters are actively and timely uploaded to the control management center through the GPRS network. Based on the BS structure, the Control Management Center is developed in the ASP environment. The user interface is completely a WEB page presented in the browser. It can be operated anywhere without installing special software to achieve zero maintenance of the client. The data is stored in the database server. The client does not store any business data and database connection information. The data is real-time and the security can be reliably guaranteed. The Control Management Center also integrates GIS functions to facilitate monitoring and management of the terminal system.
2. 3 Control Management Center Workflow
The workflow of the Control Management Center is shown in Figure 2. The specific operation process is as follows:
(1) The remote monitoring computer sends a request to the WEB server through the browser. After the WEB server processes, the corresponding ASP file is called to the database server for query, and the monitoring webpage browseable by the client is listed according to the customer authority, and the query result is sent back to the WEB server. After that, it returns to the browser as an HTML page and displays it to the user.
(2) The operation or parameter setting instruction issued by the client is directly saved to the database server through the WEB server, and the communication server periodically calls the parameter information from the database and sends it to the remote terminal.
(3) The remote terminal transmits the collected power parameter information and alarm information to the communication server through the GPRS communication module, and transfers it to the database server for the WEB server to call.
3 key technical analysis and system configuration
3. 1 key technical analysis
3. 1. 1 data transmission
The communication server is a data transmission and transmission module that implements data transfer between the client and the remote terminal. According to the function module to be implemented, it can be divided into: monitoring the client running status and operation request; establishing communication with the remote terminal, receiving the live real-time data sent by the terminal; and transmitting the control information to the remote terminal. The threads of the communication server include:
The main thread, whose function is to initialize the thread, establish a socket listening socket, is responsible for opening a thread for the new client connection request, establishing a data transmission socket; the data transmission thread, the thread is a concurrent service process, and simultaneously responds to multiple The client (remote terminal) requests the data and sends the operation command and parameter setting information.
The data transmitted by the communication server can be divided into three categories: periodic data (such as daily switching time, etc.), burst data (such as manual operation, etc.) and non-real-time data. Therefore, the priority queue is used in the implementation to define the priority of the data type, to ensure that the data with the highest priority is sent from the transmission queue first, and the data with the same priority is sent in the order. At the same time, the data transmitted remotely must be filtered, legally checked and stored in three steps to ensure the reliability of the data.
3. 1. 2 system security
In order to ensure the security of the management system and prevent malicious attacks by illegal users, several aspects of network access security control need to be done: (1) using authorized access control technology. Only authorized users are allowed to access the database with appropriate rights, restricting them from modifying or deleting data information at will.
(2) The system security control is implemented by binding the IP address, and the client's IP address is obtained by using the ASP Request object.
3. 2 system configuration and software components
The monitoring system uses Windows 2003 Server + IIS 6.0 as the system service platform, using SQL Server2000 database; the client recommends using Widows XP 2000 + IE 6. 0 for browsing query. The web development environment adopts ASP, selects MapInfo profession 7. 5 as the GIS+ platform, and uses MapXtreme engine as the map integration development tool. 3 is the remote client monitoring screen.
4 control management center main functions
4. 1 basic parameter settings
It is mainly composed of function modules such as switch lamp time setting, midnight light function setting, alarm parameter setting, and remote terminal basic information management. It realizes remote setting of street lamp running parameters and updates to each terminal system in real time. 4 shows the switch light time setting interface and time curve.
4. 2 remote control
It consists of data summoning, time calibration, manual control and other modules to realize the remote control function. It can also call the data operation to check the working status of the street lamp and the power information of each branch at any time. The manual switch light operation interface is shown, which can be controlled separately for the three-phase branch.
4. 3 data management
The control management center has the functions of intelligent classification management and statistical analysis on various data reported, and manages the data reported by the remote terminal by several modules such as data query, operation record query, alarm record query, and electricity consumption statistics, which is convenient for querying. Relevant historical records, and by analyzing relevant data, estimating electricity consumption and generating reports for management's reference. The historical data query interface reported by the remote terminal is shown.
5 Conclusion
The remote street lamp management system based on BS structure realizes the system remote monitoring and data browsing, and has the advantages of simple structure, uniform interface, easy maintenance, good expansibility, strong portability and high sharing degree. It is the municipal lighting management of modern cities. development trend. At present, the system has been adopted by many users, with good performance, real-time data transmission, high reliability, and can meet user requirements.
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