Estimating the short-circuit impedance
Publication: Research - peer-review › Article in proceedings – Annual report year: 1997
Standard
Estimating the short-circuit impedance. / Nielsen, Arne Hejde; Pedersen, Knud Ole Helgesen; Poulsen, Niels Kjølstad.
In: 32'nd Universities Power Engineering Conference, UPEC'97. Manchester : UMIST, 1997. p. 453-457.Publication: Research - peer-review › Article in proceedings – Annual report year: 1997
Harvard
APA
CBE
MLA
Vancouver
Author
Bibtex
}
RIS
TY - GEN
T1 - Estimating the short-circuit impedance
A1 - Nielsen,Arne Hejde
A1 - Pedersen,Knud Ole Helgesen
A1 - Poulsen,Niels Kjølstad
AU - Nielsen,Arne Hejde
AU - Pedersen,Knud Ole Helgesen
AU - Poulsen,Niels Kjølstad
PB - UMIST
CY - Manchester
PY - 1997
Y1 - 1997
N2 - A method for establishing a complex value of the short-circuit impedance from naturally occurring variations in voltage and current is discussed. It is the symmetrical three phase impedance at the fundamental grid frequency there is looked for. The positive sequence components in voltage and current are derived each period, and the short-circuit impedance is estimated from variations in these components created by load changes in the grid. Due to the noisy and dynamic grid with high harmonic distortion it is necessary to threat the calculated values statistical. This is done recursively through a RLS-algorithm. The algorithms have been tested and implemented on a PC at a 132 kV substation supplying a rolling mill. Knowing the short-circuit impedance gives the rolling mill an opportunity to adjust the arc furnace operation to keep flicker below a certain level. Therefore, the PC performs a simultaneously measurement of impedance and flicker.
AB - A method for establishing a complex value of the short-circuit impedance from naturally occurring variations in voltage and current is discussed. It is the symmetrical three phase impedance at the fundamental grid frequency there is looked for. The positive sequence components in voltage and current are derived each period, and the short-circuit impedance is estimated from variations in these components created by load changes in the grid. Due to the noisy and dynamic grid with high harmonic distortion it is necessary to threat the calculated values statistical. This is done recursively through a RLS-algorithm. The algorithms have been tested and implemented on a PC at a 132 kV substation supplying a rolling mill. Knowing the short-circuit impedance gives the rolling mill an opportunity to adjust the arc furnace operation to keep flicker below a certain level. Therefore, the PC performs a simultaneously measurement of impedance and flicker.
BT - 32'nd Universities Power Engineering Conference, UPEC'97
T2 - 32'nd Universities Power Engineering Conference, UPEC'97
SP - 453
EP - 457
ER -