Method based on independent component analysis for harmonic extraction from power system signals

• We proposed a method based on ICA to extract harmonics from power system signals.
• The method is able to extract harmonics with a rapid dynamic response.
• It presents a good performance in the presence of interharmonics and sags.
• It presents a good performance for signals with power frequency variations.
• The proposed method requires simple filtering in operational stage.

This paper presents a new application of independent component analysis for harmonic component extraction from power system signals (voltage and current). The harmonics to be extracted can be time varying and the method does not require synchronous sampling, which means it is able to work in off-nominal frequency. The proposed method has shown to be simple in the operational stage. The method was tested using both simulated and real signals, and performance was evaluated using measures in both frequency and time domains. Results were compared with another method available in the literature.