The paper deals with an originai application oj the Short-Time Fourier Transform (STFT) to instantaneous power measurements. This technique can be easily implemented in a dedicated instrument to perform accurate time-frequency analysis ofthe time-varying harmonic contents ofnetwork powers (in their active and imaginary components), which are typically non-stationary signals. Moreover, new algorithms have been examined carefully and developed to attain high levels ofaccuracy,flexibility and efficiency through STFT-PD (Power Distribution). Particularly, optimized interpolationformulas were used, derivedfrom the windowing theory to reduce the negative effects due to leakage during instantaneousfrequency changes. The effectiveness ofthe suggested technique and, particularly, the high level of accuracy achieved in time-varying amplitude andfrequency measurements ofthe analysed components of instantaneous powers and currents has been proven by means of suitable simulations.
|Titolo:||Instantaneous power measurement in time‐frequency domain|
|Data di pubblicazione:||1996|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1002/etep.4450060517|
|Appare nelle tipologie:||1.1 Articolo in rivista|