陈蓉,杨勇,樊明迪.新型电力系统下电能质量信号的分数域降噪方法研究[J].电测与仪表,2023,60(9):81-87. Chen Rong,Yang Yong,Fan Mingdi.De-noising method based on fractional Fourier transform for power quality signals in the new power electronic power systems[J].Electrical Measurement & Instrumentation,2023,60(9):81-87.
新型电力系统下电能质量信号的分数域降噪方法研究
De-noising method based on fractional Fourier transform for power quality signals in the new power electronic power systems
Under the background of "dual carbon", a large number of distributed generation connected to the grid cause power quality disturbances, which pose challenges to the stable operation of the grid. With the integration of nonlinear and high-speed loads, power quality disturbance will exhibit non-stationary characteristics in the new power electronic power systems. By analyzing the energy distribution characteristics of different types of power quality disturbance in the fractional domain, an improved de-noising algorithm based on fractional Fourier transform (FRFT) is proposed. In addition, the estimation method of the optimal fractional transform angle is discussed. Based on the fourth order origin moment of fractional spectrum, the calculation complexity can be effectively reduced by using one-dimensional peak search to determine the best transform angle. The experimental results show that the improved algorithm can effectively reduce the noise of both stationary and non-stationary transient disturbances and retain the location information of transient disturbances.
