Slot ripples in the damper windings of a salient-pole synchronous generator

Matsuki, Junya; Katagi, Takeshi; Okada, Takao

doi:10.1109/60.282483

Cited by 22 publications

(6 citation statements)

References 14 publications

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“…pole while bar 7 is located on the leading side. The trend with higher slot frequency bar currents on the lagging side of the pole is in agreement with experimental data presented by Matsuki et al in [14]. The general agreement between bar currents predicted by the rotating field model and FEA is reasonable.…”

Section: A Balanced Load Damper Losssupporting

confidence: 91%

The rotating field method applied to damper loss calculation in large hydrogenerators

Ranlöf

Lundin

2010

The XIX International Conference on Electrical Machines - ICEM 2010

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In this paper, we discuss key aspects of analytical rotating field models that can be used to estimate the damper losses in large hydrogenerators during steady load conditions. Model features of particular importance, like the saturation permeance and the structure of the damper circuit are described in greater detail. Damper currents extracted from the analytic model are found to be in good agreement with currents obtained from coupled field-circuit 2-D finite element calculations. The applicability of the model for damper current prediction during steady unbalanced load conditions is also demonstrated.

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Section: A Balanced Load Damper Losssupporting

confidence: 91%

The rotating field method applied to damper loss calculation in large hydrogenerators

Ranlöf

Lundin

2010

The XIX International Conference on Electrical Machines - ICEM 2010

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“…The PhD thesis of KRATKI [7] describes the usage of an inductance model in order to calculate the influence of damper currents on the voltage shape of the stator winding. MATSUKI et al [9] present damper current measurements on a salient pole machine. NICA et al [10] analyse the effect of current harmonics in converter-driven machines.…”

Section: Introductionmentioning

confidence: 98%

Calculation of power losses in the damper winding of large hydrogenerators at open-circuit and load conditions

Traxler-Samek

Lugand

Schwery

2008

2008 18th International Conference on Electrical Machines

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This paper presents an analytical method for the calculation of currents and power losses in the damper winding of large salient-pole synchronous machines at various steadystate operational conditions. The algorithm is based on a damper winding network containing aU damper bars of a repetitive section of the machine. The self and mutual inductances as weD as the induced voltages are computed taking into account the air-gap permeance function.The presented algorithm is used to compute currents in the damper winding at open-and short-circuit test conditions. The obtained analytical results are compared with the results of transient finite element studies.

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“…Bacher and Koefler [4] measure damper currents on a turbogenerator. Matsuki et al [5] show damper-current measurements on a salient-pole synchronous machine. Karmaker and Knight [6], [7], as well as Knight et al [8], [9] currents in converter-and line-fed synchronous machines.…”

Section: Introductionmentioning

confidence: 98%

Additional Losses in the Damper Winding of Large Hydrogenerators at Open-Circuit and Load Conditions

Traxler-Samek

Lugand

Schwery³

2010

IEEE Trans. Ind. Electron.

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Large salient-pole synchronous machines are typically equipped with a damper winding. At steady-state conditions, parasitic voltages are induced in the damper bars which lead to a current flow with associated power losses. This paper describes an analytical algorithm for the calculation of currents and corresponding losses in the damper winding. The presented method is based on an equivalent network of the damper winding containing all the bars of a repetitive section of the machine. The inductances are calculated with an air-gap permeance model. Contrary to similar existing approaches, the induced damper-bar voltages are computed using a numerical integration. This allows more precise results when it comes to higher harmonics. In order to validate the analytical computation, the results are compared with the results of 2-D transient finite-element studies and with a conventional analytical method based on the d-and q-axis equivalent circuits of the machine.

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Slot ripples in the damper windings of a salient-pole synchronous generator

Cited by 22 publications

References 14 publications

The rotating field method applied to damper loss calculation in large hydrogenerators

The rotating field method applied to damper loss calculation in large hydrogenerators

Calculation of power losses in the damper winding of large hydrogenerators at open-circuit and load conditions

Additional Losses in the Damper Winding of Large Hydrogenerators at Open-Circuit and Load Conditions

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