The Study Of Mathematical Morphology In Power Quality Disturbance Detection

As a new theory,mathematical morphology has the advantages of less computation steps,simplicity and fast response.It has been widely applied to nonlinear signal location problems.Under this background,the research of power quality disturbance detection algorithm is carried out in this paper.First of all,the basic concept of power quality and the signal models of several transient disturbances are clarified,and the waveforms corresponding to the corresponding disturbances of voltage signals are simulated by simulation.The basic theory of mathematical morphology is introduced.From the angle of filtering,the basic operation of mathematical morphology,the basic operator of morphology,the morphological gradient and the basic principle of the morphological filter operator are expounded in detail.Secondly,the dq transformation is studied deeply,and an improved single phase dq transformation method is adopted.By this method,the initial phase of the disturbance signal and the depth of the disturbance amplitude change can be obtained.A mathematical morphology filter is constructed.After filtering the original signal,the start and stop time of the disturbance is located by the edge detection method.A power quality disturbance method based on flexible morphological filtering and short window power is proposed.The basic concept of flexible morphology and the principle of flexible morphological filter and flexible morphological gradient machine operator are expounded.The method of weighted statistical sorting is used to replace the maximum and minimum operation of standard morphology.On this basis,a flexible morphological filter is constructed.After filtering,the mutation and end time of the signal are determined by the change of the morphological gradient and the short window power algorithm.Finally,a power disturbance location algorithm based on morphological empirical mode packet(EMD)and simplified entropy is proposed.Combining EMD and mathematical morphology,a morphological EMD filter is constructed.By simplifying the entropy method,the singularity detection method is given.Through Matlab simulation experiments,the experimental conclusion is obtained.The filtering methods and location methods proposed in this paper are compared.