New method for the calculation of subtransmission and distribution system transients based on the FFT

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17 Citations (Scopus)

Abstract

A method is presented for the calculation of bus voltage transients in an electric power system. The method is specifically intended for application to distribution and subtransmission networks during the application of large industrial loads. In this sense, the calculation is a power quality assessment. In particular, the case of load currents that are electronically switched may be analyzed. The essence of the method is the Fourier transform of Ohm's law. The fast Fourier transform is used for computational efficiency. An interesting method for obtaining the Fourier transform of the bus transfer impedance is developed from the theory of parallel n-port networks. Examples are used to illustrate the calculation of bus voltage transients harmonic content. Although the latter is not a transient, harmonic voltages may be calculated by the proposed method under certain circumstances. The main application illustrated is that a transient which has dynamics which occur in a time interval of similar order as the period of the power frequency (i.e., 1/60 s for a 60-Hz system).

Original languageEnglish (US)
Pages (from-to)1869-1875
Number of pages7
JournalIEEE Transactions on Power Delivery
Volume4
Issue number3
DOIs
StatePublished - Jul 1989
Externally publishedYes

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Fast Fourier transforms
Fourier transforms
Electric potential
Power quality
Electric power systems
Computational efficiency

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

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title = "New method for the calculation of subtransmission and distribution system transients based on the FFT",
abstract = "A method is presented for the calculation of bus voltage transients in an electric power system. The method is specifically intended for application to distribution and subtransmission networks during the application of large industrial loads. In this sense, the calculation is a power quality assessment. In particular, the case of load currents that are electronically switched may be analyzed. The essence of the method is the Fourier transform of Ohm's law. The fast Fourier transform is used for computational efficiency. An interesting method for obtaining the Fourier transform of the bus transfer impedance is developed from the theory of parallel n-port networks. Examples are used to illustrate the calculation of bus voltage transients harmonic content. Although the latter is not a transient, harmonic voltages may be calculated by the proposed method under certain circumstances. The main application illustrated is that a transient which has dynamics which occur in a time interval of similar order as the period of the power frequency (i.e., 1/60 s for a 60-Hz system).",
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