skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A development of a generalized frequency - domain transient program - FTP

Abstract

A generalized frequency-domain transient program (FTP) is developed in the paper. The FTP is based on a frequency-time transform method adopting nodal analysis, admittance parameter and modal theories. Discontinuous and nonlinear elements are solved as initial condition problems using a piece-wise linear approximation of the nonlinear characteristics. The FTP is used to solve the transient and steady states of a network composed of an arbitrary interconnection of basic circuit elements. The FTP is structured to be compatible with the EMTP so that the same input data and output formats are those of the EMTP can be used. The present version of the FTP can deal with a network with over a hundred of nodes and branches. Comparisons of calculated results by the FTP with field test results and calculated results by the EMTP confirm a high accuracy and a satisfactory efficiency of the FTP. The FTP is of great advantage to offer the most accurate or theoretically exact solutions of transients on distributed-parameter lines.

Authors:
;  [1]
  1. (Doshisha Univ., Kyoto (JP))
Publication Date:
OSTI Identifier:
6627938
Alternate Identifier(s):
OSTI ID: 6627938
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Trans. Power Del.; (United States); Journal Volume: 3:4
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; INTERCONNECTED POWER SYSTEMS; ELECTRICAL TRANSIENTS; ACCURACY; CALCULATION METHODS; DATA ANALYSIS; FREQUENCY RESPONSE TESTING; NETWORK ANALYSIS; NONLINEAR PROBLEMS; ENERGY SYSTEMS; POWER SYSTEMS; TESTING; TRANSIENTS; VOLTAGE DROP 200104* -- Fossil-Fueled Power Plants-- Components

Citation Formats

Nagaoka, N., and Ametani, A.. A development of a generalized frequency - domain transient program - FTP. United States: N. p., 1988. Web. doi:10.1109/61.194010.
Nagaoka, N., & Ametani, A.. A development of a generalized frequency - domain transient program - FTP. United States. doi:10.1109/61.194010.
Nagaoka, N., and Ametani, A.. Sat . "A development of a generalized frequency - domain transient program - FTP". United States. doi:10.1109/61.194010.
@article{osti_6627938,
title = {A development of a generalized frequency - domain transient program - FTP},
author = {Nagaoka, N. and Ametani, A.},
abstractNote = {A generalized frequency-domain transient program (FTP) is developed in the paper. The FTP is based on a frequency-time transform method adopting nodal analysis, admittance parameter and modal theories. Discontinuous and nonlinear elements are solved as initial condition problems using a piece-wise linear approximation of the nonlinear characteristics. The FTP is used to solve the transient and steady states of a network composed of an arbitrary interconnection of basic circuit elements. The FTP is structured to be compatible with the EMTP so that the same input data and output formats are those of the EMTP can be used. The present version of the FTP can deal with a network with over a hundred of nodes and branches. Comparisons of calculated results by the FTP with field test results and calculated results by the EMTP confirm a high accuracy and a satisfactory efficiency of the FTP. The FTP is of great advantage to offer the most accurate or theoretically exact solutions of transients on distributed-parameter lines.},
doi = {10.1109/61.194010},
journal = {IEEE Trans. Power Del.; (United States)},
number = ,
volume = 3:4,
place = {United States},
year = {Sat Oct 01 00:00:00 EDT 1988},
month = {Sat Oct 01 00:00:00 EDT 1988}
}
  • In order to design more efficient photoelectrochemical cells and photovoltaic devices, it is necessary to identify the limiting processes and to determine the kinetics of the controlling reactions. In this paper the authors report on a technique for the analysis of relaxation of photoprocesses at illuminated semiconductor electrodes in the frequency domain by transformation of the perturbating function and the transient response. Results are presented for simulated photocurrent transients showing that diagnostic parameters can be extracted from both real-axis and imaginary-axis transformation.
  • In a previous paper, a simple frequency-domain stability criterion was proposed for networks near the stability limit subjected to a 3-phase fault with no loss of line. The criterion can be summarized as follows: if a system is stable, the phase angle of the Fourier transform of a network`s transient voltage response exhibits a clockwise polar plot behavior at all buses (i.e. for increasing frequency); if the system is unstable, it exhibits a counterclockwise behavior in at least one location. Though these results are of interest, the criterion would be of greater practical use in mechanizing dynamic security analysis ifmore » it could be extended to the types of contingencies actually used in security analysis, namely normal contingencies. Normal contingencies are commonly defined as the loss of any element in a power system, either spontaneously or preceded by a fault, and such changes in topology impact post-contingency steady-state voltages in addition to their transient behavior. The present paper shows how such cases can be treated, thereby extending the applicable range of the criterion to normal contingencies.« less
  • Single-shot ultrafast transient absorbance spectroscopy based on the frequency encoding of kinetics is demonstrated. The kinetics are sampled in the frequency domain using linearly chirped, amplified 33 fs pulses derived from a Ti:sapphire laser. A variable length grating pair compressor is used to achieve sampling of 512 channels with a 2-160 ps window with sensitivity>5 x10{sup -4}. In terms of the acquisition time, frequency-domain 'single-shot' (FDSS) spectroscopy has an advantage over pump-probe spectroscopy when 'noise' is dominated by variations in the amplitude of the signal due to pump and flow instability. Unlike some other single-shot techniques, FDSS can be usedmore » for fluid samples flowing in a high-speed jet and for thin solid samples that exhibit interference fringes. Another advantage is that, due to interference of quasimonochromatic components of the chirped probe pulse, an oscillation pattern near the origin of the FDSS kinetics emerges. This pattern is unique and can be used to determine the complex dielectric function of photogenerated species. The advantages of FDSS are illustrated with the kinetics obtained in multiphoton ionization of aqueous iodide and one-photon excitation of polycrystalline ZnSe.« less
  • In this paper, a two-dimensional symmetric-Galerkin boundary integral formulation for elastodynamic fracture analysis in the frequency domain is described. The numerical implementation is carried out with quadratic elements, allowing the use of an improved quarter-point element for accurately determining frequency responses of the dynamic stress intensity factors (DSIFs). To deal with singular and hypersingular integrals, the formulation is decomposed into two parts: the first part is identical to that for elastostatics while the second part contains at most logarithmic singularities. The treatment of the elastostatic singular and hypersingular singular integrals employs an exterior limit to the boundary, while the weaklymore » singular integrals in the second part are handled by Gauss quadrature. Time histories (transient responses) of the DSIFs can be obtained in a post-processing step by applying the fast Fourier transform (FFT) and inverse FFT to the frequency responses of these DSIFs. Several test examples are presented for the calculation of the DSIFs due to two types of impact loading: Heaviside step loading and blast loading. The results suggest that the combination of symmetric-Galerkin and FFT algorithms in determining transient responses of the DSIFs is robust and effective.« less
  • This paper reports the results of performing transient stability simulations of a power system using frequency domain methods and makes comparisons with a standard time domain simulation of the same events, both simulations being run on both a VAX and Cray machine. Because of their inherent structure, one is usually forced to implement time domain simulations by serial techniques that are not capable of effectively exploiting parallel and vector processing capabilities. Frequency Domain techniques, on one hand are more likely to give rise to vector and matrix operations which are amenable to parallel and vector processing, while on the othermore » hand they are generally less efficient in dealing with nonlinearities. This study is aimed at estimating the relative benefits of one simulation method over the other.« less