Piecewise modeling and dynamic analysis of hydro-turbine governing system in the process of shutdown transient
Abstract
This paper pays attention to the piecewise continuous time modeling of a hydro-turbine governing system in the process of shutdown transient. As a pioneering work, the piecewise nonlinear dynamic transfer coefficients are introduced into the system. Moreover, for different hydrographs of shutdown transient process, the effect of different shutdown laws on the quality of shutdown transient process has been analyzed by numerical simulations. The nonlinear dynamic behaviors of the hydro-turbine governing system are illustrated by bifurcation diagrams, Poincaré maps, time waveforms and phase orbits. More importantly, these methods and analytic results are useful for the safe and stable operation of a hydropower station in the process of shutdown transient.
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