Research On The Application Of Embedded ARM-Linux System In Interharmnics Detecting

Inter-harmonic problems in power system has become more and more serious at the present time. The effects of them caused an increasing interest among electrical power engineers. Basing on kinds of theory and literature on interharmonics, many methods for solving the inter-harmonic problem were proposed. However, most of these methods can not harmonize the precision and the real-time performance of detecting interharmonics in power system, which emptying a place to further study on inter-harmonics problems. To solve this problem, it's very important to select a good breakthrough point and a point of balance. This paper takes this aspect as a study content. Besides, the works on inter-harmonic at present mostly concentrate in theory, few people make actual application to test the algorithm on actual platform, especially on embedded platform. This paper lay particular emphasis on this aspects. A high precision algorithm with new idea was introduced in this paper, which was improved as a basis to suit for the embedded ARM-Linux system. The major content in this paper are as follow:(1) Introduce the sources and negative effects of inter-harmonics. Explain the definitions to inter-harmonics with a summary form according to the description to interharmonics by IEEE61000-2-1.(2) Simulate Interpolation FFT Algorithm and Adaptive Algorithm by Correlation which are two existing detection algorithms on Matlab after analyzing much present detection algorithm to interharmonics. Test and compare these two algorithm's simulation result. Reduce the miscellaneous part of the later algorithm, the complexity of correlation was reduced based on the repeatability of data while calculating the length of numerical vector. The improved algorithm can run on the embedded ARM-Linux platform steadily.(3) Fling up a Interharmonics Detection System based on embedded ARM-Linux according to the principle of optimization, including the works to plant the embedded Linux system to the ARM9 platform and to plant the drivers of LCD and keyboard to the embedded Linux system.(4) Obtain a signal sequence through equidistant extracting the simulant signal which including the interhamonics in the real world, then settle the sequence by the improved adaptive algorithm, and show out the operation result by means of embedded GUI named MiniGUI at the end.(5) Assess the actual effect while the impoved adaptive algorithm running on the embedded ARM-Linux system, and propose the orientation for further study.