Study of hydraulic transients in hydropower plantssuccifically in hydraulic turbine units, with penstock. sDiral case and I-.-, '. . draft tube -is necessary due to power and frequency oscillations wbich normally occur in generator units, mainly during load re.jections. In turn, this causes large pressure and subpressure oscillations in turbine hydraulic system and it must be evaluated to discrete hvdraulic svstems with emohasis on hydraulic oarameter This work deals with the utilisation of an analog/digital simulation method of nonlinear analog discrete models. The model is obtained through the analogy between fundamental equations and discrete circuits PI. The method presents fast convergence and avoid n,echanical In this context, this work analyses the utilisation. analysis. ?he siinuiatioii used was' developed~ based on analog inathematical models of transient phenomenon equations and on a hydro turbine model. Thc results were obtained by using a nonlinear In the first section, the fundamental equations for transient flows, their simplified and adimensional forms and mainly, the analog hydraulic parameters of inductance, capacitance analog-digital simulation method. Comparisons between results of a and resistance [ I ] are presented. theoretical simulation of a literature example using the the second section, a discrete circuit ( in a T-form), a characteristics method and the rcsults obtained with the present nonlinear analog discrete model and a full hydro turbine method are presented. Theoretical simulation results obtained from a model are presented. 360 MW turbine and experimental results are also confronted.In the third section. a comoarison between simulated and keywords: transients -discrete hydraulic systems -hydro turbine experimental results is presentedIn"rlCl
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