Study of hydraulic transients in hydropower plants throughsimulation of nonlinear model of penstock and hydraulic turbine model

摘要

Study of hydraulic transients in hydropower plants specifically innhydraulic turbine units, with penstock, spiral case and draft tube-isnnecessary due to power and frequency oscillations which normally occurnin generator units, mainly during load rejections. In turn, this causesnlarge pressure and subpressure oscillations in turbine hydraulic systemsnand must be evaluated to avoid mechanical failures. In this context,nthis work analyses discrete hydraulic systems with emphasis on hydraulicnparameter analysis. The simulation used was developed based on analognmathematical models of transient phenomenon equations and on a hydronturbine model. The results were obtained by using a nonlinearnanalog-digital simulation method. Comparisons between results of antheoretical simulation of a literature example using the characteristicsnmethod and the results obtained with the present method are presented.nTheoretical simulation results obtained from a 360 MW turbine andnexperimental results are also confronted