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Damping of Torsional Resonances in Generator Shafts Using a Feedback Controlled Buffer Storage of Magnetic Energy

Damping of Torsional Resonances in Generator Shafts Using a Feedback Controlled Buffer Storage of Magnetic Energy,C. Sihler,A. M. Miri,A. Harada

Damping of Torsional Resonances in Generator Shafts Using a Feedback Controlled Buffer Storage of Magnetic Energy   (Citations: 4)
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The power and energy for ASDEX Upgrade, Ger- many's largest experiment for nuclear fusion research, is pro- vided by three separate networks based on flywheel genera- tors. Damage at couplings of the shafts of the flywheel genera- tors EZ3 (144 MVA / 500 MWs) and EZ4 (220 MVA / 600 MWs) were discovered during a routine check. They can only be explained by subsynchronous resonances (SSR) which are excited by active power transients from the converter loads. Torque sensors were installed for generator protection. They cause an early termination of plasma experiments if a prede- fined torque level is exceeded. Since the low natural damping involved with torsional resonances was identified as a major cause of the SSR phenomena observed, two feedback con- trolled DC circuits were developed providing electromagnetic damping for the generator shafts in case of SSR excitation. Since April 2003, the damping circuits have been routinely operated during all plasma experiments. They provide suffi- cient active damping power to avoid a trip signal from the torque sensors. The paper summarises results from analysing, designing, commissioning and operating these damping cir- cuits which might be of general interest since they are an ef- fective and low cost solution for damping SSR in electric power systems.
Published in 2003.
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    • ...However, byusinga powerelectronics converter andan inductive [2]orcapacitive energystorage, an electrical methodcanbeusedtoimplement anactive damping...
    • ...Thepaper isorganized asfollows; tobegin with, adescription ofthebasic approach oftheactive damping system (Chapter 2).InChapter 3,theexisting andpresently usedsystem, whichisbased oninductive energy storage, will bepresented...
    • ...Thisrectifier isconnected inparallel tothestator windings ofa synchronous orasynchronous machine (Fig 2)...

    T. Zolleret al. Application of Power Electronics for Damping of Torsional Vibrations

    • ...As a countermeasure to the electromechanical resonance problems experienced at IPP, a novel thyristor controlled device was developed in order to increase the torsional mode damping in the shaft assembly of the synchronous generators [3]...
    • ...This permits to design a control loop with a real-time characteristic [3]...
    • ...The method is based on applying an additional electrical torque through the stator winding, thus causing the same effect as one (or more) increased coefficient(s) in the mechanical damping matrix of the shaft system [3]...

    A. M. Miriet al. Suppression of Subsynchronous Resonance by a Parallel Connected Damper...

    • ...As a countermeasure to these torsional resonance problems a novel feedback controlled circuit was developed for damping the torsional oscillations [4-5]...

    C. SIHLERet al. ACTIVE DAMPING OF TORSIONAL MODES IN TURBINE-GENERATOR SHAFTS

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