Time-frequency based instantaneous power components for transient disturbances according to IEEE Standard 1459

Summary form only given: IEEE Standard 1459 defines the power components based on the fast Fourier series. However, Fourier series assumes the signal is periodic in nature, and provides erroneous assessment of the power components in the presence of transient signals. Therefore, a new method is proposed for the evaluation of the IEEE Standard 1459 power components based on the time-frequency distribution (TFD) and the cross time-frequency distribution (XTFD) of transient signals. The TFD and XTFD preserve simultaneous time and variable frequency information of transient signals, and estimate the instantaneous power components according to the IEEE Standard 1459. Results of computer simulated and real-world power quality (PQ) disturbance case studies justify the effectiveness of the proposed method for the assessment of instantaneous power components under transient condition.