Influence of Stator Parameter Variation and Phase-Shift Under Synchronizing Out of Phase on Turbine Generator Electromagnetic Field

Li, Weili; Wang, Purui; Li, Jinyang; Wang, Likun; Gong, Shiyun; Liu, Dong

doi:10.1109/tec.2017.2654598

Cited by 18 publications

(8 citation statements)

References 23 publications

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“…According to the finite element discrete and weighted residual method [23,24], by combining Equations ( 1) and ( 2), the electromagnetic equation can be written as follows:…”

Section: Field-circuit Coupled Time-stepping Finite Element Model Of ...mentioning

confidence: 99%

Optimal design of q ‐axis field winding structure of dual‐excited synchronous condenser

Luo

et al. 2022

IET Electric Power Appl

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The dual‐excited synchronous condenser (DESC) has two field windings whose axes are located at direct and quadrature axes respectively. The DESC has more capacity of absorbing reactive power than that of the traditional synchronous condenser (TSC). However, the q‐axis field winding distributed on the d‐axis magnetic pole surface can decrease the magnetic circuit area of the rotor core of DESC, thus it may result in the increase of the total harmonic distortion (THD) of the magnetic field and the oversaturation of the rotor magnetic circuit. In order to obtain better electromagnetic characteristics of DESC, a q‐axis field winding structure is proposed by optimising the number of slots, slot pitch and slot dimensions. The influences of the number and pitch of slot in q‐axis on the air‐gap radial flux density and THD of DESC are studied under the d‐, q‐ and dual‐axis excitation modes. The dimensions of the q‐axis slots are optimised by combining the time‐stepping finite element method and Taguchi method, and the optimal structure of q‐axis field winding is obtained. A 10‐kVar DESC is developed to verify the simulation results. This study provides theoretical basis for the design and manufacture of the DESC.

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“…According to the finite element discrete and weighted residual method [23,24], by combining Equations ( 1) and ( 2), the electromagnetic equation can be written as follows:…”

Section: Field-circuit Coupled Time-stepping Finite Element Model Of ...mentioning

confidence: 99%

Optimal design of q ‐axis field winding structure of dual‐excited synchronous condenser

Luo

et al. 2022

IET Electric Power Appl

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“…To study accurately the electromagnetic characteristics and operating characteristic of the DESG, the T-S FEM of the DESG is established. The electromagnetic equation can be expressed as follows [19]:…”

Section: The Time-stepping Finite Element Model Of the Desgmentioning

confidence: 99%

“…To study accurately the electromagnetic characteristics and operating characteristic of the DESG, the T‐S FEM of the DESG is established. The electromagnetic equation can be expressed as follows [19]:

{\begin{cases} Ω : \frac{\partial}{\partial x} (\frac{1}{μ} \frac{\partial A}{\partial x}) + \frac{\partial}{\partial y} (\frac{1}{μ} \frac{\partial A}{\partial y}) = - J \\ Γ : A = 0 \end{cases}

where A is magnetic vector potential, μ is permeability, J is current density.…”

Section: The Structure and Time‐stepping Finite Element Model Of The ...mentioning

confidence: 99%

Finite‐element calculation of electromagnetic characteristics and steady‐state stability of dual‐excited synchronous generator

Wang

Liu

et al. 2021

IET Electric Power Appl

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The Dual-Excited Synchronous Generator (DESG) has two sets of field windings. The magnitudes and directions of the two field currents can be regulated, so that the excitation magneto-motive force can be in any direction. The electromagnetic characteristics of the DESG may be different with those of the Traditional Synchronous Generator (TSG) for the different rotor structures of the two generators. To obtain better electromagnetic characteristics, a time-stepping finite element model (T-S FEM) of the DESG is established. The air-gap radial flux density, saturation, active and reactive power of the DESG in single-and dual-axis excitation modes are calculated and compared with those of the TSG. The electromagnetic characteristics affected by the different ratio of qaxis field current to d-axis field current are studied. On this basis, an excitation control strategy that can enhance the steady-state stability is proposed, and the steady-state stability limits with and without excitation control are calculated by the T-S FEM. A 10-kW DESG is developed to verify the correctness of the simulation results. The results show that the DESG with dual-axis excitation has better electromagnetic characteristics and stronger reactive power ability, and the steady-state stability limit of the DESG is increased obviously through the excitation control.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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“…It is found that the electromagnetic force on the end windings will be significantly increased in the 3-phase short circuit condition [21]. In the meantime, Li et al have also discovered that the magnetic field in the end region will be greatly changed when synchronizing out of phase occurs, and the large impulse current may damage the winding insulation [22]. Moreover, it is also pointed out that either the short circuit degree or the short circuit position will affect the electromagnetic forces as well as the vibration characteristics of the end windings in synchronous generators [23].…”

Section: Introductionmentioning

confidence: 99%

Effect of Static Rotor Eccentricity on End Winding Forces and Vibration Wearing

Jiang

Tang

et al. 2021

International Journal of Rotating Machinery

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In order to study the vibration wearing regularity and the strength failure point of stator end windings before and after static rotor eccentricity, the three-dimensional electromagnetic forces and the subsequent mechanical responses are studied in this paper. The electromagnetic force, stress, and deformation on the end winding of the QFSN-600-2YHG turbo-generator are calculated by the finite element method (FEM) through an electromagnetic-structure coupling. The radial vibration characteristics of the winding are verified by experiments. It shows that the vibration wearing in the same layer is more serious than that between two neighboring layers. For different layers, the interphase coils endure a larger wearing risk than the innerphase coils. Inside the same phase, the last coil along the rotating direction has the highest risk of insulation wearing. The occurrence of static rotor eccentricity will significantly increase the electromagnetic forces and the vibration amplitudes on some coils. The end-phase coil which is close to the minimum air-gap point is the most dangerous one due to the lasting overstresses and the intensified deformations.

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Influence of Stator Parameter Variation and Phase-Shift Under Synchronizing Out of Phase on Turbine Generator Electromagnetic Field

Cited by 18 publications

References 23 publications

Optimal design of q ‐axis field winding structure of dual‐excited synchronous condenser

Optimal design of q ‐axis field winding structure of dual‐excited synchronous condenser

Finite‐element calculation of electromagnetic characteristics and steady‐state stability of dual‐excited synchronous generator

Effect of Static Rotor Eccentricity on End Winding Forces and Vibration Wearing

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