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Calculation of Eddy Current Loss in the End Region of Large Hydro-generator

Author: GaoJinLong
Tutor: FuMin
School: Harbin University of Science and Technology
Course: Motor and electrical
Keywords: Hydrogenerator Finite element method Eddy current field Eddy current loss Three-dimensional solid model
CLC: TM312
Type: Master's thesis
Year: 2011
Downloads: 66
Quote: 0
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Abstract


With the long-distance EHV power grid investment and upgrading , high-capacity generator set is also increasingly used . On the large generator , the reduction of the cost of stand-alone capacity of the generator , along with the increase in power density , so the problem of eddy current losses in the motor becomes particularly prominent. In order to ensure the safe and reliable operation and service life of large generating units , we must first large - scale hydroelectric generating internal vortex field of in-depth study . A capacity of 1000MW large turbine generator , electric and magnetic fields and eddy current field calculation and analysis , in-depth study on the generator end structure eddy current loss in the further analysis of large - scale hydroelectric generating internal physical field to provide a basis . Motor eddy current loss calculation is an important part of the design of large generators , not only related to the safe and reliable operation of the generator , and directly related to the life of the generator , the accurate calculation of the magnetic field is to ensure that the premise of the eddy current loss calculation accuracy . Based on the basic theory of the electromagnetic field , the use of two-dimensional finite element method for solving nonlinear steady - state magnetic field generator no-load and load operation , the air-gap flux density , Fourier transform, to determine the fundamental component and times harmonics and rated field current of the generator no-load and full-load operating conditions were calculated in accordance with the electromagnetic formula . The eddy current loss generated by the generator end portion of magnetic flux leakage in the structure of the end portion is one of the reasons for the motor to local overheating . Alternating electromagnetic field theory based mathematical model based on the A - phi method described three-dimensional sine eddy current field , the structural characteristics of the hydraulic generator ends , the the hydroelectric generating end of the three-dimensional solid model , and generator load and full load generator end magnetic field of the two operating conditions were calculated , the hydroelectric generating end -load and full-load operating conditions of the structural parts of the magnetic vector potential and scalar potential , and the the generator end portion of each structural member of the eddy current density and the eddy current loss calculation formula is obtained by eddy current losses , given the distribution of eddy current loss in the the generator end portion of the main structural member .

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CLC: > Industrial Technology > Electrotechnical > Motor > Generators, large the generator group ( Zonglun,) > Turbine generator
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