基于FRFT的電能質(zhì)量擾動(dòng)濾波算法研究
[Abstract]:With the large input of electronic equipment and the harm of large load, the power quality of the power grid is gradually decreasing. The problem of power quality has attracted more and more attention from all walks of life and consumers. The correct filtering and detection of the disturbance signal is a important prerequisite for improving and improving the power quality. It can be divided into two classes of steady state and transient state. For a few disturbances, the time domain or frequency domain analysis can be used. The current mainly uses the time frequency combination to analyze the power quality problem. The main research is the transient power quality disturbance signal. In order to improve the power quality, we should choose the appropriate method to treat it. The signal is filtered, and then a variety of transient problems can be detected, evaluated and classified. According to the non-stationary of the transient power quality, this paper describes several transient signal filtering methods. Based on the fast Fourier transform (FFT) filtering method, it is the most widely used algorithm, but it is only suitable for the analysis of stationary signals. For non-stationary signals, the transient power quality disturbance filter based on fractional Fourier transform (Fraction fouriertranform, FRFT) is used in this paper. Although the transient signal processing effect is better, it can not characterize the local characteristics of the signal, but the traditional wavelet is not enough in the time-frequency domain, and in some cases the noise is not sound. In order to make up these shortcomings, the fractional wavelet transform is studied and analyzed on the basis of FRFT. The simulation platform of MATLAB/Simulink is used to build the model, and the result of the filtering of FRFT to the noise signal is simulated. The comparison and analysis of the experimental data shows that the filtering effect of the FRFT is better than that of the FFT, and the validity of the FRFT filter is confirmed and the fractional order is small. The wave transform filter has less computation, better filtering effect, better reduction waveform and its characteristics, overcomes the shortcomings and shortcomings of the single algorithm, and verifies the feasibility of the filtering algorithm. The filtering method of this paper has good filtering effect on transient signals and can effectively analyze transient disturbance signals.
【學(xué)位授予單位】:安徽理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TM711
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