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A Deep Harmonic Decomposition (Deep HarDec) approach is proposed in this paper, being developed by means of a deep neural network, allowing to obtain estimations of the amplitude and phase quantities of a given periodic signal. Consequently, harmonic characterization of periodic signals are explored in this paper, assessing the suitability of the Deep HarDec. Such a method can be potentially applied to the real-time management of electric power systems as well as other control applications, supporting the monitoring of harmonic distortions and providing means to active filtering interventions targeting power quality improvement. In order to build the Deep HarDec model, a dataset comprising diverse combinations of the fifth, seventh, eleventh, and thirteenth harmonic orders was considered, covering a wide range of operational perspectives. A grid search technique was used to find the best configuration …