Abstract
In recent years, simulation studies of hydro power plants have been carried out more and more often. Reasons for such studies are to predict the dynamic behaviour of the plant, to design and to test the control algorithms, and to investigate on problems apearing in already operating plants. A short survey on simulation techniques such as the methods of characteristics and hydraulic imedance, analog and digital control-loop simulation is followed by discussion of three case studies. In the first case, a power plant was not able to perform steady state isolated network operation. In the second case, at interconnected-grid operation, a limit cycle appeared in a small range of operation. Simulation studies enabled to improve the control behaviour. The third case study concerns the penstock of a high-head power plant that showed heavy cracks after some years of operation. A simulation study, applying all above mentioned techniques proved that resonance oscillations were caused by unstable behaviour of the power-control loop.
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