A new method to detect and locate instantaneous voltage disturbances
Tian Li-jun · Power System Protection and Control · 2010
A characteristic method for voltage disturbances based on singular value decomposition is proposed.Hankel matrix is constructed using the time series of voltage signal.Then singular value decomposition is executed to the Hankel matrix and the decomposition of the voltage signal is calculated.At every decomposition layer,the start point and the end point show prominence and then they can be detected.At each side of the start point in the original signal,one cycle signal is taken out to calculate the fundamental component by FFT.The type of the voltage disturbance can be gotten by the relationship between the fundamental components and the index can also be gotten.A circuit to simulate instantaneous voltage disturbance is made.Experiment system is set up based on LabVIEW and data acquisition system.The experiment results show the correctness of the method and its superiority over the wavelet.