| Along with the development of electronics and the automated technology, the electric power electronic installation linkd variable current equipment, the frequency conversion equipment and so on. The capacity expands day by day and the quantity increases day by day, which cause more and more serious harmonic in the electrical network. How to minimize the damage harmonics has become an urgent problem to be sloved. The component of harmonic in the power network is very complicated. Therefore, harmonic detecting and analysis has become the premise for avoiding or reducing harmonic pollution. Research a kinds of harmonic measurement device application based on arm has very wide application prospect.Based on the analysis of harmonic detection technology at home and abroad on the status and development direction of the foundation, this paper analyzes and studies all kinds of harmonic detecting methods in the world. Including gives emphasis to introduce the method based on FFT theory.In this paper, we use ARM9 Samsung S3C2410 processor hardware architecture of the building and the use of Linux Embedded operating system for harmonic detector design program. Design of the program on the basis of this paper,the harmonic detection of hardware and software systems for each specific design. Hardware, the Selection from the CPU, the core S3C2410 circuit module design, LCD interface circuit design, keyboard interface circuit design, IDE interface circuit analog interface circuit design described in detail; Through the Synchronizing circuit in this article, we can obtain the cycle of three-phase voltage and current in the power network, by Multi-channel synchronized gathering, to avoid or reduce the spectrum leakage and hurdle effect of FFT. Software for embedded Linux gave a detailed presentation discussed in the Linux platform S3C2410 transplantation of specific methods and steps to develop the IDE, keyboard interface circuit and IDE in Linux hardware drivers, and then write the applications incluiding the main program, harmonic detection procedures, communication procedures and so on. Finally, through the test of sample machine, the harmonic detecting and analysis system which designed in this article can achieve harmonic content of the detection and analysis exactly and reliably. |
