Abstract
Analysis on the stability of oscillation in a hydraulic system equipped with a surge tank has been made. The Thoma condition of stability is modified by taking account of the effect of inertia of flowing water in the penstock, hydraulic characteristics of turbine, characteristics of the turbine speed governor, inertia of rotating part of turbinegenerator, and paralleled running of power plants. Extensive numerical computation has been made basing on the theory derived herein, and the effect of them is examined in detail. Stability regions are shown in diagrams by the use of suitably chosen dimensionless parameters.Stability of oscillation in the hydraulic system having no surge tank has also been analysed and is compared with the result in the case when a surge tank is equipped.Furthermore, the response of the whole hydraulic system to the periodic variation of power demand has been analysed. The theoretical result thus derived is compared with the result of field measurement in an electric power plant. Good agreement is shown between the theory and measurement.Basing on this study, guidelines for deciding whether the installation of a surge tank is necessary or not in a relevant case are proposed.
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