Title :
How to avoid unstable time domain responses caused by transformer models
Author_Institution :
SINTEF, Trondheim, Norway
fDate :
4/1/2002 12:00:00 AM
Abstract :
Modeling a three-winding transformer gives occasionally a negative reactance that may result in an unstable circuit. This unstable condition can be eliminated by neglecting the magnetizing losses or taking them into account in a different way as shown in this paper. Unstable responses are, under certain conditions, extremely dependent on the time step when using EMTP or similar programs. This paper shows why simulated terminal voltages do not always reveal an unstable circuit condition
Keywords :
eigenvalues and eigenfunctions; power transformers; time-domain analysis; transformer windings; EMTP; eigenvalue analysis; magnetizing losses; negative reactance; three-winding transformer modelling; time step; transformer models; unstable circuit; unstable time domain responses avoidance; Circuit stability; Eigenvalues and eigenfunctions; Frequency; Impedance; Magnetic analysis; Magnetic domains; Magnetic separation; Polynomials; Stability analysis; Time domain analysis;
Journal_Title :
Power Delivery, IEEE Transactions on
