Harmonic Detecting System Based On Dsp Research And Design

In recent years, with the wide application of various kinds of non-liner loads, the harmonic pollution of electric net is more and more serious and the quality of electric power is declining. If the harmonic can't be controlled, it will affect the whole electric net running safe and economical. So, it is necessary to prevent the harmonic peril and to assure safe running of the power system with detecting accurate harmonic content and predominating harmonic practice status firmly.Firstly, the paper generally introduces the theory of the harmonic analysis algorithm. Thereinto, there are difficulties in performing synchronized sampling and integral period truncation for the harmonic analysis in the power system with the Fast Fourier Transform (FFT), the result of the electric power harmonic detection is disturbed by the frequency leakage, so the Window-interpolation FFT is introduced. This paper analyzes and deduces the Window-interpolation FFT algorithm in detail , then analyzes the algorithm by Matlab simulation. The simulation results have verified the effectiveness and practicability of the algorithm. Secondly, the paper uses the DSP processor chip TMS320LF2407A as hardware core and gives detection system's hardware design in detail, such as signal gathering part, A/D converting part, liquid crystal displaying part, data communication part and so on. Finally, the dissertation finishes the main software design and gives corresponding module's procedure process.The software of harmonic detection algorithm has been debugged in laboratory. The practical simulating has proved that the analysis of the theory is correct, the real-time character and accuracy can meet the requirement of harmonic detection. The design of the hardware is simple. So the project has some practical value.