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Date of Publication:2012-01-01

Journal:水力发电学报

Issue:3

Page Number:240-245

ISSN No.:1003-1243

Abstract:This paper derives expressions of electromagnetic torque and electromagnetic stiffness with energy method and develops a mechanical-electrical coupling torque vibration model for a hydro generator shaft system under hydraulic and electromagnetic excitations,focusing on a study on the effects of rotor moment inertia,spiders′ stiffness,added mass of water and hydraulic excitation frequency.Frequency response curves of shaft torque,torsional vibration angle and electromagnetic torque are presented,including the mechanical-electrical coupling resonance to hydraulic excitations of zero and first order frequencies and the influences of excitation electric current and internal active power angle.These results provide a reference for design and stable operation of hydro generator set.

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