3D Transient Electromagnetic-Temperature Field Analysis of the Loss and Heat of the Damper Bars of a Large Tubular Hydro-Generator During Short Circuit Faults

Hu, Qiong; Xiao, Ke; Zhou, Zhiting; Fan, Zhaolin; Yong, Yang; Bian, Zu-Ying; Li, Jing-Can; Yao, Bing

doi:10.1109/access.2020.3008156

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…With respect to the large synchronous condenser, the end threedimensional fluid-solid coupling heat transfer model of the large synchronous condenser was established in [3] to investigate the influence of different cooling media on the temperature of the end structure, and the electromagnetic field and temperature field models of the large synchronous condenser were coupled with the power grid model in [4][5] to calculate the loss and temperature distribution of the rotor under the single-phase short-circuit fault. With respect to the large hydro-generator, the lumped method was used in [6][7] to analyze and optimize fluid and temperature distribution, and the three-dimensional fluid-solid heat transfer model of the stator and rotor were, respectively, established in [8][9] and [10] to analyze the fluid and temperature distribution. With respect to the large turbo-generator, the fluid-solid coupling model of stator, rotor and end were, respectively, established in [11], [12], and [13] to analyze the fluid and temperature distribution.…”

Section: Introductionmentioning

confidence: 99%

Study on the Fluid-Solid Coupling Heat Transfer in the Stator of Large Synchronous Condenser Considering Complex Transposition Structure

Bian,

Sun,

Zou

et al. 2024

IEEE Access

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To solve the problem in which it is difficult to consider the complex transposition structure of the stator winding in the stator fluid-solid coupling analysis of a large synchronous condenser, a threedimensional stator fluid-solid coupling model considering the transposition structure of the stator winding is established in this paper. Based on the heat transfer characteristics of the transposition insulation in the slot portion and involute insulation in the end portion, a non-uniform grid division method is proposed to solve the three-dimensional fluid-solid coupling model. Then, taking a 300Mvar synchronous condenser as an example, the stator fluid distribution and temperature distribution were calculated and analyzed, and the results were compared with the non-transposition model and short-circuit type test data. The results show that the transposition structure affects the temperature distribution trend, temperature value and location of the highest temperature of the stator winding. The calculated results obtained using the transposition model were closer to the test data. Finally, the stator temperatures under no-load, overexcited, and no-excited operating conditions were calculated and compared. The results show that the stator temperature distribution trends and values are significantly affected by operating conditions. The stator temperature under the over-excited condition was the highest, and that under the no-load condition was the lowest.INDEX TERMS Large synchronous condenser, complex transposition structure, fluid-solid coupling, heat transfer, stator

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Section: Introductionmentioning

confidence: 99%

Study on the Fluid-Solid Coupling Heat Transfer in the Stator of Large Synchronous Condenser Considering Complex Transposition Structure

Bian,

Sun,

Zou

et al. 2024

IEEE Access

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“…3-D FEM and analytical method are two main methods for calculating the above problems. Based on 3-D transient FEM, the magnetic field and eddy current losses in the end region of large electrical machine were calculated in [3][4], and the temperature distribution in the end region of the water-hydrogen cooled turbine generator was calculated in [5][6][7][8] Author (e-mail: xxxx@126.com).…”

Section: Introductionmentioning

confidence: 99%

Improved Analytical Algorithm for Magnetic Field of End Windings in 300Mvar Synchronous Condenser

et al. 2021

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The magnetic field of end windings affects the leakage reactance of end windings and the eddy current losses of end structures in the large electrical machine. With the rising of single-machine capacity, such effect becomes more obvious. However, due to the complexity of end structures of large electrical machine, it will cause difficulty in meshing and long calculation time to calculate the magnetic field of end windings by using 3-D finite element method (FEM). In order to calculate the magnetic field of end windings quickly and accurately, an improved analytical algorithm (IAA) is proposed based on the mirror image principle, which takes into account the influence of stator back core and air-gap on the magnetic field of end windings by adding the fictitious boundary current and air-gap current, respectively. Taking a 300Mvar synchronous condenser (SC) as an example, the boundary current, air-gap current and magnetic field of end windings are calculated. Then, the influence of stator back core and stator involute segment current on the magnetic field of end windings are analyzed, which provides a theoretical support for the design and optimization of SC. To validate the accuracy of IAA, the calculation result is compared with 3-D FEM.INDEX TERMS Synchronous condenser, magnetic field, analytical algorithm, mirror image, stator back core.

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“…In [17], the field-circuit coupled finite-element method is applied to predict the performance of an induction motor by solving the nonlinear time-stepping finite-element equations, coupled with circuit equations and mechanical motion equations. The research described in [18] is focused on the transient analysis of the electromagnetic and temperature fields on tubular hydro-generators during short-circuit faults. Testing and fine-tuning of the developed dynamic mathematical model of the hydropower plant, for research into the dynamic conditions of a transmission power system, are described in [19].…”

Section: Introductionmentioning

confidence: 99%

Verification Methodology for Simulation Models of the Synchronous Generator on Transients Analysis

2021

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During transients that occur in an electric network, large currents can flow and large electromagnetic torques can be developed in electric generators. Accurate calculation of currents and magnetic fields during transients is an important element in the optimal design of generators and network parts, as well as mechanical parts of machines and other torque transmission parts. This paper describes the modeling of a sudden three-phase short-circuit on a synchronous generator using the finite element method (FEM) and the dynamic model. The model for simulations that use the FEM was built in the MagNet software package, and the dynamic model is embedded in the MATLAB/Simulink software package. The dynamic simulation model of a part of a network with two identical generators, represented by equivalent parameters, was developed. The results obtained after the simulation of a sudden three-phase fault in the generators by both methods are presented, including three-phase voltages, three-phase currents, machine speeds, excitation voltages, and mechanical power. In particular, the short-circuit current in the phase with the highest peak value was analyzed to determine the accuracy of the equivalent parameters used in the dynamic model. Finally, the results of these two calculation methods are compared, and recommendations are presented for the application of different modeling methods.

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3D Transient Electromagnetic-Temperature Field Analysis of the Loss and Heat of the Damper Bars of a Large Tubular Hydro-Generator During Short Circuit Faults

Cited by 6 publications

References 12 publications

Study on the Fluid-Solid Coupling Heat Transfer in the Stator of Large Synchronous Condenser Considering Complex Transposition Structure

Study on the Fluid-Solid Coupling Heat Transfer in the Stator of Large Synchronous Condenser Considering Complex Transposition Structure

Improved Analytical Algorithm for Magnetic Field of End Windings in 300Mvar Synchronous Condenser

Verification Methodology for Simulation Models of the Synchronous Generator on Transients Analysis

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