Digital stability analysis of power generating units

Effects of system nonlinearities on synchronous machine control

“…Several linear methods of analysis and synthesis such as Bode plots, eigenvalue tests, Nyquist's criterion, root locus plots and Routh Hurwitz criterion have been applied to linear models of power systems (5,19,24,58,75,82,98).…”

“…The first is the digital computer approach and is an extension of the well established network analyzer simulation (6,35,47,79,82,90,91,104,124,125,132,135). The second approach, based on…”

“…nonlinearities due to amplifiers, limitera, exciter saturation (5,6,82,91,108,121,140). The major nonlinearities of a hydro governing system are the variation of turbine characteristics with load and constraint on the motion of the turbine wicket gates (133).…”

“…However, several authors and machine designers in different organizations use somewhat different techniques in handling exciter saturation (13,40,52,82) .…”

Effects of system nonlinearities on synchronous machine control

“…Those very commonly mentioned in the literature are the nonlinearities due to machine saturation, nonlinearities due to speed, saliency and the control section, ie. nonlinearities due to amplifiers, limitera, exciter saturation (5,6,82,91,108,121,140). The major nonlinearities of a hydro governing system are the variation of turbine characteristics with load and constraint on the motion of the turbine wicket gates (133).…”