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Ding S.,Harbin Institute of Technology | Ge Y.,Harbin University of Science and Technology | Xu D.,Harbin Institute of Technology | Miao L.,Harbin Power Engineering Company Ltd | And 2 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

In order to clarify the fluid flow characteristics inside double-fed wind generator, a 1.5 MW double-fed wind generator was taken as an example. According to the structure and cooling type of generators, a multi-dimensional model of fluid-solid coupled for solving the temperature field was established based on fundamental assumptions. By adding boundary conditions, the temperature and fluid fields were analyzed numerically using the finite volume method. And the calculated results were compared with test data, which proved the correctness of the computing method and the solving model. At last the characters of cooling medium (water and air) inner the stator and rotor, such as flow velocity, temperature rise and path lines, were analyzed, which reveals the changing regularity on the performance of cooling medium for large doubly-fed wind generators. © 2012 Chin. Soc. for Elec. Eng. Source


Ding S.,Harbin University of Science and Technology | Sun Z.,Harbin University of Science and Technology | Xu D.,Harbin Institute of Technology | Miao L.,Harbin Power Engineering Company Ltd
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

With the increase of wind generator capacity and electromagnetic load, heating problem becomes one of the major factors that would affect the performance and economic benefit of generating set. To solve the problem, a 3 MW double-fed wind generator was taken as an example. On the basis of hydromechanics and heat transfer theory, the mathematical and physical model of 3D fluid flow and heat transfer coupled was established according to structure characteristic of generator. The governing equation of fluid-flow and thermal field was calculated coupled using finite volume method by giving fundamental assumptions and corresponding boundary conditions. Finally, the performance of fluid flow, characteristic of heat transfer, and temperature rise distribution of stator and rotor were analyzed in detail. Some useful conclusions were achieved, by which a theory gist for accurate calculation of synthetic physical fields for the larger capacity wind generator is provided. © 2012 Chinese Society for Electrical Engineering. Source


Ding S.-Y.,Harbin University of Science and Technology | Ding S.-Y.,Harbin Power Engineering Company Ltd | Ding S.-Y.,Harbin Institute of Technology | Sun Z.-Q.,China Electronics Technology Group Corporation | And 2 more authors.
Dianji yu Kongzhi Xuebao/Electric Machines and Control | Year: 2012

With the increase of wind generator capacity and electromagnetic load, temperature rise calculation and fluid flow analysis become important. Aiming at nonuniform temperature rise distribution and complex fluid flow inside generator, on the basis of computational fluid dynamics (CFD) and heat transfer theory, the mathematical and physical model of 3D fluid flow and heat transfer coupled was established according to structure characteristic of 2.5 MW permanent-magnet wind generator. Fluid-flow and thermal field was calculated coupled using finite volume method by giving fundamental assumptions and corresponding boundary conditions. From the research, the performance of fluid flow, characteristic of heat transfer, surface coefficient of heat transfer, and temperature rise distribution of generator were obtained, and the calculation result was compared with test value. The results show that numerical investigation was agree measured results, by which a theory gist for accurate calculation of synthetic physical fields and structure optimization for the larger capacity permanent-magnet wind generator is provided. Source


Ding S.-Y.,Harbin Institute of Technology | Ding S.-Y.,Harbin Power Engineering Company Ltd | Ding S.-Y.,Harbin University of Science and Technology | Ge Y.-Z.,Chinese Peoples Liberation Army | And 3 more authors.
Dianji yu Kongzhi Xuebao/Electric Machines and Control | Year: 2012

The mathematic relationship of the temperature field solved by the fluid and solid coupling is clarified according to hydromechanics and heat transfer theory. The solution domain including 1/8 region of generator along circumferential direction was established based on the electromagnetic structure, ventilation and cooling method of 1.5 MW doubly-fed wind generator when combined with fluid flow and heat transfer characteristics inside the motor. Fluid and temperature field inner generator were calculated numerically by using finite volume method, and the solving results was analyzed in detail. Besides, the velocity and flow distribution of cooling air in the circulation area were obtained. Then the temperature distribution and heat transfer characters of the electrical motor were analyzed. Finally, the calculated results show good agreement with the measured results, which will provide a theoretical basis for the operation of wind generator and the design of greater capacity of wind generator. Source


Ding S.-Y.,Harbin University of Science and Technology | Ding S.-Y.,Harbin Power Engineering Company Ltd | Ding S.-Y.,Harbin Institute of Technology | Sun Z.-Q.,Harbin University of Science and Technology | And 2 more authors.
Dianji yu Kongzhi Xuebao/Electric Machines and Control | Year: 2010

To explore stator temperature field and distribution principle of major insulation temperature drops inside large turbo-generator. A large generator with different structure strands is taken as an example, according to ventilation performance and structure characteristic of generator, two dimensional fluid field model inside stator radial duct was given and it was numerically calculated using finite volume method (FVM). Meanwhile, the mathematical model and physical model of three dimensional stator temperature field were established for generator with different structure strands and it was numerically analyzed by finite element method (FEM) baesd on getting the heat transfer coefficients of all heat transfer surfaces. Investigation results show that calculated results of temperature correspond with measures results, the highest temperature is located on the strand of upper bar adjacence to stator notch, maximum and anerage value of major insulation temperature drops of upper and bottom bar are not same, and temperature drops of upper bar are bigger than that of bottom bar. Thus the theoretical foundation can be offered for large generator strands structure optimization. Source

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