Detection and Classification of Transient Power Quality Disturbances Based on Complex Wavelet Transform
Yi Liu · Power System Technology · 2010
A method that derives complex wavelet corresponding with Daubechies real wavelet is proposed. On this basis, by use of phase information of complex wavelet transform several types of short duration power quality disturbances (SDPQD) are analyzed. To remedy the defect that the characteristic of the phase diagram obtained from complex wavelet transform is not obvious, the improved phase diagram, by which the phase variation can be observed more clearly, is put forward, thus the disturbances can be located more accurately; meanwhile, according to the characteristics exhibited by the improved phase diagram, various disturbances can be easily classified. Simulation results show that using the improved phase diagram several types of SDPQD can be detected and classified easily and effectively.