Damper Winding Influence on Unbalanced Magnetic Pull in Salient Pole Generators With Rotor Eccentricity

Wallin, Mattias; Bladh, Johan; Lundin, Urban

doi:10.1109/tmag.2013.2259633

Cited by 37 publications

(23 citation statements)

References 14 publications

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“…For reducing the occurrence of the above situations, damping bars were arranged on the rotor poles, which could restrain the vibration of the generator [15,16]. However, when the negative sequence current exists in the armature winding, the eddy current loss will be affected.…”

Section: Electric Current Density Distribution Of the Damper Windingmentioning

confidence: 99%

Analysis of the Influence of Asymmetric Grid on Synchronous Hydro Generator

Qiu¹,

Fan²,

Feng³

et al. 2017

PIER M

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Abstract-In order to analyze the influence of three-phase asymmetrical operation of a generator on its stable operation, firstly, taking a 24-MW bulb turbine generator as an example, the 2-D transient electromagnetic field model is established. Through the comparison analysis of the experimental results and simulation data, the correctness of the model is verified. Secondly, the values of air gap flux density, torque and loss in different conditions are obtained by using the finite element method. The effects of asymmetric three-phase current on air gap flux density, torque and loss are determined. Thirdly, the corresponding relationships between the three-phase current unbalance degree and torque ripple, eddy current loss are established, and the variations of torque ripple and eddy current loss are given when the three-phase current unbalance degree is changed. The result shows that the asymmetry three-phase current makes the torque ripple and eddy current loss increase dramatically, which seriously threaten the safe and stable operation of the generator. Finally, the further study on the torque ripple and eddy current loss of the generator under different current distributions and the same three-phase unbalance degree identifies that the content of negative sequence current is a key factor to affect the torque ripple and eddy current loss.

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Section: Electric Current Density Distribution Of the Damper Windingmentioning

confidence: 99%

Analysis of the Influence of Asymmetric Grid on Synchronous Hydro Generator

Qiu¹,

Fan²,

Feng³

et al. 2017

PIER M

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show abstract

“…Torque ripple is an important index to evaluate the operation stability of a generator system : the smaller the torque ripple, the higher the operation stability of generator. The damper bar is an important component to suppress generator rotor vibration . Heating of the damper bar will affect the safety and stability of generator system.…”

Section: Introductionmentioning

confidence: 99%

The influence of asymmetric pole shoe on synchronous hydro generator

Qiu

Fan

2018

IEEJ Transactions Elec Engng

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In order to reduce the saturation degree of magnetic flux density at the pole shoe on the right side of the pole in a generator and reduce the pole‐to‐pole leakage, an asymmetric pole shoe structure is proposed in this paper. The influence of the asymmetric pole shoe structure on the generator performance is analyzed. First, a bulb tubular turbine generator with a single unit capacity of 24 MW is taken as an example. The two‐dimensional electromagnetic field model of the generator is established based on finite element analysis software, and the correctness of the model is verified through comparative analyses of the experimental results and simulation data. Second, the magnetic flux density distributions of poles under different pole shoe structure parameters are analyzed, and their distribution characteristics are also discussed. Finally, by studying the generator air gap flux density, average torque, torque ripple, eddy current loss, and core loss when the pole shoe structure is different, the variations of the above parameters along with the increase of the pole shoe depth are obtained. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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“…Therefore, a damper winding is generally adopted in synchronous a hydro generator. The damper winding could effectively restrain rotor vibration [2][3][4][5]. The damper winding is an important part of a hydro generator.…”

Section: Introductionmentioning

confidence: 99%

Eddy current density asymmetric distribution of damper bars in bulb tubular turbine generator

Qiu

Fan

et al. 2017

Archives of Electrical Engineering

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Abstract:The major reasons that cause the damage of damper bars in the leeward side are found in this paper. It provides a route for the structure optimization design of a hydro generator. Firstly, capacity of a 24 MW bulb tubular turbine generator is taken as an example in this paper. The transient electromagnetic field model is established, and the correctness of the model is verified by the comparison of experimental results and simulation data. Secondly, when the generator is operated at rated condition, the eddy current density distributions of damper bars are studied. And the asymmetric phenomenon of the eddy current density on damper bars is discovered. The change laws of the eddy currents in damper bars are determined through further analysis. Thirdly, through the study of eddy current distributions under different conditions, it is confirmed that the stator slots and armature reaction are the main factors to affect the asymmetric distribution of the eddy current in damper bars. Finally, the studies of the magnetic density distribution and theoretical analysis revealed the asymmetric distribution mechanism of eddy current density.

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Damper Winding Influence on Unbalanced Magnetic Pull in Salient Pole Generators With Rotor Eccentricity

Cited by 37 publications

References 14 publications

Analysis of the Influence of Asymmetric Grid on Synchronous Hydro Generator

Analysis of the Influence of Asymmetric Grid on Synchronous Hydro Generator

The influence of asymmetric pole shoe on synchronous hydro generator

Eddy current density asymmetric distribution of damper bars in bulb tubular turbine generator

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