Research On Analysis Method Of Power System Disturbance Behavior Based On Adaptive Iterative Filtering Algorithm

As the power system in recent years,large-scale power grid and large-capacity power electronic equipment widely used,making the power system to increase the probability of interference at the same time,after the disturbance of the power system waveform also showed a strong non-smooth,Non-linear oscillatory characteristics.Power system disturbance behavior has been a serious threat to the system safe and stable operation,so through the disturbance behavior analysis of power system operation has become the main technical means.Based on the above situation,the main work of this paper is as follows: Firstly,through the structural characteristics of the existing power system,the main types of disturbances and their hazards are analyzed,and the existing disturbance analysis methods based on the measured signals are classified.Secondly,the basic characteristics of the disturbance signal of the existing power system are analyzed,and the extraction process of the natural modal components in the multivariate coupled disturbance signal of the power system is summarized.On this basis,the difference of the different methods in the extraction process is analyzed.The iterative filtering algorithm and the adaptive iterative filtering algorithm based on FP function are described.Thirdly,the negative damping mechanism of the power system low frequency oscillation is analyzed briefly.The parameters of the low frequency oscillation are obtained by understanding the mechanism.According to the actual oscillation behavior of the power system,the parameters are extracted by the Hilbert transform and the least squares method.And the effectiveness of the proposed algorithm is verified by the low frequency oscillation simulation of power system.Last,the adaptive iterative filtering algorithm is introduced into the power quality analysis of the power system.The types of power quality disturbance and the corresponding indexes in the power system are expounded.According to the different power quality categories,the parameters are identified,the analysis of the algorithm to verify the adaptability of this algorithm.