Abstract
Phasors are a steady state concept. In reality, a power system is never in a steady state. Voltage and current signals have constantly changing fundamental frequency (albeit in a relatively narrow range around the nominal frequency) due to changes in load and generation imbalances and due to the interactions between real power demand on the network, inertias of large generators, and the operation of automatic speed controls with which most generators are equipped.
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Phadke, A.G., Thorp, J.S. (2017). Phasor Estimation at Off-Nominal Frequency Inputs. In: Synchronized Phasor Measurements and Their Applications. Power Electronics and Power Systems. Springer, Cham. https://doi.org/10.1007/978-3-319-50584-8_3
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DOI: https://doi.org/10.1007/978-3-319-50584-8_3
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