Research On Algorithm Of Harmonic Analysis In Electric Power-Net

Recently, harmonic analysis is an important area in the electric power system. Because of large-scale applications of electrical instruments, the harmonic pollution of electric net is gradually serious and the quality of electric power is declining. As a result, real-time measurement of harmonic is very important for avoiding the harmonic peril and improving the quality of power supply. First, the dissertation amply analyzes the principles of several harmonic analysis algorithms which are used frequently, then generally introduces the researching,application situation and existed problems of several preferable harmonic analysis algorithms used home and abroad. Thereinto, this paper analyzes and deduces the interpolating windowed FFT algorithm in detail, then systematically analyzes the error features and bounds of the algorithm by computer simulation. At the same time, we can obtain some important conclusions of the harmonic analysis applications.Secondly, the dissertation presents more valid and practical project of harmonic analysis based on the several problems of different algorithms. This harmonic analysis algorithm presented in this paper gets sampling datum using asimultaneous sampling technology, then alters these sampling datum by the interpolation algorithm in order to achieve the effect of simultaneous sampling. It deduces the interpolation formula of simultaneous sampling datum calculated by the asimultaneous sampling datum and uses Fast Fourier Transform (FFT) technology to calculate harmonic parameters. In the end, it gives harmonic errors' datum and curves by means of math model and computer simulation.Finally, on the base of the theory and project mentioned above, the dissertation gives this project's hardware design in detail, such as signal disposing part, computer controlling part and A/D converting part, then compiles corresponding harmonic analysis software and other datum processing programs. The software of harmonic analysis algorithm has been debugged and passed in laboratory. The practical simulating proved that theory analysis is correct. The hardware is simple, the real-time character and accuracy can meet the requirement of harmonic detection. So the projecthas some practicability.