Research on Harmonic Detection Scheme of New Energy Grid Under New Power System

In recent years, the wide application of power electronics, distributed generation and new energy technologies has led to a large number of nonlinear devices such as rectifiers and frequency converters being used in industrial and civil fields. However, the harmonics injected by these devices into the power grid are more and more complicated, which poses a serious threat to the green operation and safety of the power system. Only accurate harmonic detection can be effectively controlled. This paper analyzes the principle and advantages and disadvantages of harmonic detection methods based on analog filter, Fourier transform, wavelet transform, instantaneous reactive power theory and neural network. The harmonic detection method based on Fourier transform is analyzed, and the problem of fence effect and spectrum leakage is solved by using Hanning window bispectral interpolation to optimize fast Fourier algorithm. Finally, the complex harmonic signal is simulated and analyzed by simulation. The simulation results show that the method is effective and accurate, which improves the method of harmonic detection in power system.