The Analysis And Implementation Of Harmonic Detection System Based On ARM Embedded

Harmonic is one of the main factors of affecting power quality. In recent years, with the power electronic devices was widely used in electric railway, petrochemical, metallurgy, coal and other industrial areas, the power system harmonic content increased, seriously affecting the safe operation of power grid and power quality, it has caused a wide range of community attention. Thus the harmonic power detection and management has become an important issue for research in the field of power system.The traditional harmonic detection system have certain advantages, but in many respects exist obvious technical disadvantage. ARM Embedded system has big advantage in network and software portability,and it can provd good graphic interface and network services for the harmonic detection system, This is largely offset some deficiency of the previous power grid detection harmonic detection system.The harmonic detection system that based on the ARM Embedded was designed from the angle of harmonic detection in this thesis. First, using the Fast Fourier transform algorithm to analyze harmonic, mainly using 128 points of time-domain extraction that based on 2-FFT algorithm to measure the harmonic signals, and it can obtain the harmonic content within 20 times; Secondly, According to appear spectrum leak problem in analyzing harmonic signal , through adding the hanning window function can inhibit and adding the interpolation double-peak spectral lines correction algorithm for revising the hanning window function , and better improved the measuring accuracy; Finally ,through MATLAB simulation validated the feasibility of the proposed algorithm.The development platform of system was based on ARM9 and C/OS-â…¡. In the hardware, using S3C2410 of the Samsung company as the CPU, has realized the three-phase voltages and currents signal synchronous collection, the analog signal digital processing and lower place machine of serial communication function. The Hardware circuit design includes signal regulate circuit, frequency measurement circuit and CPU peripheral circuit. In the software, has compiled the embedded operating system C/OS-â…¡, completed its transplant in the hardware system, wrote the relevant application and using the LabVIEW completed PC graphics interface development and lower level computer data communications links, make the system has four parts function which constituted made by data acquisition, data processing, data storage and data communications four parts function.The experimental result shows that the harmonic detection system better realized the harmonic signal detection and analysis, for the development of high-performance harmonic detection device and the effective management of harmonic laid the foundation.