ARM-Based Human-machine System Of Power Quality Monitor

Recently, with the rapid development of electric utilities and the continuous expansion of power system scale, the amount of non-linear load is increasing. Power quality is seriously contaminated. Power quality problem is one of the most pressing issues in power industry in the current stage. It is significant to ensure the security and economy of the electrical equipment by developing a new type of power quality monitoring device to monitor power quality.This thesis firstly makes a deep analysis of the research status and development trends of power quality monitoring system, and the definition and significance of power quality standard are debated. Then, aiming at meeting the demand of high-precision, multifunction, network and intelligent, a design scheme of power quality monitor based on ARM and DSP is proposed. Meanwhile, this paper discussed the overall design scheme and the detail function of ARM S3C2440module. Besides, dual-port RAM which has increased the data transfer rate is adopted as the transmission media between ARM and DSP. Meanwhile we use SD card as storage media of power quality data, that has solved the problem of mass data storage. The transplantation of embedded Linux system and GUI library are realized above hardware platform. In design progress of ARM-side system software, Qt/Embedded is adopted as the embedded GUI development tool, and the embedded database is used for storing and managing the statistical power quality data. Besides, the TCP-based network communication is achieved in hardware platform. Finally the software function of ARM is tested and verified.Experiment results show that the design pattern of multiple documents based on Qt/Embedded can improve the human-machine interaction. Besides, using SQLite database can save the storage space. The function of human-machine interaction system in the thesis basically achieves the expected design purpose.