One. introduction
Renewable energy has attracted more and more worldwide attention, and wind energy resources are widely understood as a clear renewable resource. There are many successful uses of wind power generation, for example, some such as stand-alone off-grid wind turbine systems and independent wind-solar hybrid power generation systems have moved from the modeling stage to the large-scale construction stage in many countries, especially in China. However, in most cases, these wind power generation systems are located in remote areas, so how to manage these wind power generation systems and ensure that they operate well is a meaningful question.
At present, there are some urgent problems that need to be solved in off-grid wind turbines:
? Irregular management and low maintenance costs often result in loss of assets from capital sources, which will result in huge waste and the inability to provide electricity to areas without electricity.
? Off-grid wind turbines are usually in remote and relatively backward places. The service life of wind turbines will be shortened because professionals and managers cannot have off-grid wind turbines that are regularly maintained and repaired.
? Management increases the difficulty because wind management turbine contractors and sellers usually do not participate in the management of later off-grid wind turbines.
? With the development of communication technology and embedded technology, remote monitoring technology has made great progress. This article is based on remote monitoring and monitoring technology to achieve remote monitoring and maintenance and repair of off-grid wind turbine mode.
two. Remote wireless GPRS-based system monitoring of design projects
A. System structure
The remote monitoring system is composed of three parts: control terminal, central monitoring computer and communication network. The control terminal constitutes a microcontroller, a data acquisition module and a GPRS communication module.
The structure of the remote wireless monitoring system is shown in Figure 1.
Figure 1. Structural model of the remote monitoring system
B. System function
The control terminal, central monitoring computer and software perform different tasks respectively.
1) Control terminal
The control terminal is responsible for data collection, data transmission fee processing, data transmission and data storage, including direct current (DC) output voltage and current signals, alternating current (AC) output voltage and current signals, speed generator and wind speed signals, and a central monitoring computer. In addition, these projects must be real-time.
2) Central monitoring computer
The central monitoring computer needs to be responsible for receiving, storing and displaying data. At the same time, it stores the data in these data servers. According to the information theory of the principle, the data is more unstable, and the amount information is relatively large. And the disk space is limited in the data server. For this reason, we should use the corresponding program of data management, so that the data storage contains more information, in order to facilitate the evaluation of the operating conditions of wind turbines in the future. The system selects Microsoft's Access database, which is not only powerful but also relatively easy for users. For some simple management, even if we don't have any code, it can be achieved. These advantages meet our requirements.
3) Monitoring software
The monitoring software is an important channel for obtaining direct data on the operating status of wind turbines. It puts the data into the database and displays the corresponding window after they receive it in real time. Using Visual Basic software to integrate Mapx control, our electronic map includes monitoring the geographic range displayed on the main interface.
three. GPRS remote data transmission design
Considering the user's consumption level and chip performance, Lumina's ARM7 LM3S1138 chip is the best choice because the extreme sensitivity of the ARM7 embedded microcontroller application brings high-performance 32-bit computing power. This cutting-edge technology allows users to enjoy the 32-bit performance of chips and only has to pay the same price for traditional 8-bit and 16-bit devices.
The WAVECOM module Q2406B is a wireless module that supports GPRS and embedded TCP / IP protocol. [6] This is based on the Q2406B demo board and is connected to the serial interface UART (asynchronous serial communication interface) of the LM3S1138.
Figure 2. Hardware composition
A. GPRS communication protocol
The data acquisition module sends the wind turbine operating state parameters to the ARM chip through the LM3S1138 ADC module, and sends the data to the GPRS module through the LM3S1138 UART. The work of GPRS and other modules is that it begins to send location data to the central monitoring computer continuously within a predetermined time interval. [6] Compressed packages require the central monitoring computer to return a date after confirming receipt of the message, non-compressed packages do not require this message. If the GPRS terminal does not receive the confirmation message, it will be resent until the data packet is sent. The data packet contains the ID number of the wind turbine (the SIM card loading number of GPRS), which represents its identity, and the "information serial number "Send package. The center will determine the data packet according to the ID number of the wind turbine, so as to make it obvious, where the wind turbine's data packet is sent, and judge whether the data packet is lost according to the continuity sequence number information. When important information is transmitted, the center also requests confirmation messages.
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