Implementation And Research Of ARM-Based Analytical System For Power Quarity

With the development of modern industry, power electronic converter and nonlinear load have witnessed wide applications in power system. However, this has also caused the deterioration of power quality. Therefore, it's essential to conduct research and analysis on such issues as voltage and frequency deviation and harmonics in the power grid.The previous power quality analysis system was mostly based on DSP chip. DSP chip is a kind of micro processor especially tailored for digital signal processing in spite of its shortages in term of network support and portability. Besides, it's inconvenient to extend the software system and load drivers and file system, which in turn result in the incompleteness of its functionalities. Once a segment of code is revised, all the codes must be recompiled. Recently, the embedded systems have become the state of the art technology in the electronics. They are widely applied in industry control, intelligent household appliance, and telecommunication facilities. Embedded systems have great advantage in term of network and software transplantablity, especially for the reason that embedded systems can be implant into the operating systems, which to a great degree, offset the weakness of previous power quality analysis systems. This article builds up a power quality analysis system based on ARM9 and Linux platform.Firstly, this article analyze the commonly used power quality performance indexes and related measurement algorithms, especially those algorithms on harmonic analysis. Harmonic measurement based on FFT has been the most widely used power harmonic analysis method in practice. This article has conducted a detailed analysis on this algorithm and put forward some improvements to make up for its shortcomings.This article has also built up a power quality analysis system based on ARM9 and Linux platform. For the hardware part, the system chooses Samsung's S3C2410 as its CPU. All kinds of peripheral chips, like SDRAM, NOR flash, serial ports, EEPROM, AD chips, provide powerful support for the system's hardware versatility. For the software part, the author has compiled embedded Linux system and finished its hardware transplantation. All kinds of drivers have been written to support the peripheral devices in an attempt to coordinate the whole system. The rest of the work has been the programming of related programs to realize the data acquisition, processing, storage and communication functionalities.In conclusion, this article has built up a power quality system, which is representative in of the application of embedded systems to the power quality analysis system.