| Distribution monitoring terminal is a device used for real-time monitoring of running state . With the development of communication technology, the communication mode of terminal equipment in power system is constantly enriched,the single function of communication terminal obviously can not meet the requirements for modern management. To monitor electric parameter data, running status and fault of the power distribution terminal. At the same time, in order to satisfy the requirements of establish communication link in different environment,we studied the methods of data sampling and communication technology about distribution monitoring terminal .In this paper, the platform terminal based on multi communication mode is designed,which can provide users with data acquisition,storage and communication platform.Based on the research status in china and abroad of low voltage power distribution monitoring terminal ,and combined with the design requirements of the terminal, a kind of low voltage distribution intelligent monitoring terminal ,which takes into account the data acquisition and data communication was put forward in this paper. The AC voltage, current and other electrical parameters of the power network are collected and processed by the three-phase power acquisition chip, and the processed data is transmitted to the man-machine interface on the control chip.The common communication interface for wired and wireless communication is realized on the terminal, so that the data stored on the monitoring terminal can be transmitted to the background for data analysis. The wired communication interface includes 485, Ethernet; wireless communication interface includes WiFi, 3G/4G. The basic components of power distribution monitoring intelligent terminal include data sampling module, processor module, communication module, human-computer interaction module, control module, power module and some peripheral hardware interface.Distribution monitoring intelligent terminal have sampling module, the basic component of the processor module, communication module, key processing circuit, power supply module and some other peripheral hardware interfaces.Sampling module support collection, analysis and processing, storage and data transmission of analog voltage, current, power, frequency and other parameters in the secondary side. The control output module takes control of the external equipment based on the collected information. In addition to providing the power supply module chip voltage, but also to provide other DC, the DC power supply modle ensures the safety of other modules. The processor module adopts the TI chip AM335X ,which has powerful multimedia function, rich interface and strong anti-interference ability. The communication module is provided with a plurality of communication interfaces to realize the real-time transmission of data with the main station and the sub station according to the actual situation. The choice of other peripheral hardware function according to the actual need to fill the parallel port,serial port circuit. Through the processing of the data in the data buffer area of ATT7022B, the harmonic measurement can be realized. In order to solve the problem that the sampling frequency is not synchronized, the method of software synchronization is used to correct the sampling value of a period.The software design of the system includes two parts: PC server software and the MCU software. The lower computer software design includes the device drivers and the design of QT graphical man-machine interface; PC server software design includes the MFC interface design, ACCESS database design, communication acquisition program design, mainly to complete the receiving ,analysis and processing of the measured data. |
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