Abstract
Kaplan turbines, also known as movable propeller turbines, are attractive for power generation from water currents. They are controlled by guide vanes and runner blades, whose synergistic relationship plays an essential role in maintaining the stable operation of Kaplan turbine systems during transient process. Here we introduce a novel nonlinear dynamic model of a Kaplan turbine system with synergistic regulation by coupling the turbine, generator and governor. Sensitivity and stability analysis of the Kaplan turbine system are carried out based on EFAST method and stability theory. Effects of synergistic regulation on transient characteristic and stability of the Kaplan turbine system are investigated during transient process. Dynamics characteristic and stability region of the Kaplan turbine system suggest that transient performance improvement can be obtained by adjusting the synergistic relationship between the guide vanes and turning angle.
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