Hydraulic energy is one of the most important sources renewable today. It also a complementary source to other sources, being only that offers an nonpolluting storage capacity (through pump facilities). Another essential quality hydraulic its ability regulate system allow integration in which process generating depends on factors cannot be controlled (sun, wind, etc.). However, hydropower plant...

Draft tube of Francis type hydraulic turbine usually consists of: cone, elbow and diffuser. On the contrary, in some power stations an extra pipe should be added to the draft tube at the bottom of cone because of installation limitation. In this paper, this special case has been numerically studied. To this end CFD analysis was applied to simulate all parts of hydraulic turbine. A homogeneous m...

Hydraulic turbines are increasingly used to regulate the electrical grid. They thus have operate more often at off-design conditions where instabilities may develop leading large pressure pulsations decreasing life of machines. In present study, an adjustable guide vane system in draft tube a single regulated hydraulic turbine is developed. The aim mitigate when operates part load operational r...

Power system performance is affected by dynamic characteristics of hydraulic governor-turbines during and following any disturbance, such as occurrence of a fault, loss of a transmission line or a rapid change of load. Accurate modelling of hydraulic governor-turbines is essential to characterise and diagnose the system response during an emergency. In this article, both detailed and simplified...

A scheme suitable for the detection and identification of faults in power systems is presented. Two notable contributions are made: a re-modelling of faulty components of power systems that is applicable to both normal and faulty conditions, and a fault detection scheme for power systems. The faults are modelled as unknown inputs, decoupled from the state and output measurements through coordin...

In this paper we investigate the combined effect of nonstationarity in log hydraulic conductivity and the presence of boundaries on flow in heterogeneous aquifers. We derive general equations governing the statistical moments of hydraulic head for steady state flow by perturbation expansions. Due to their mathematical complexity, we solve the moment equations by the numerical technique of finit...