On Shortening the Numerical Transient in Time-Stepping Finite Element Analysis of Induction Motor Under Broken Rotor Bar Faults

Koti, Hossein Nejadi; Chen, Hao; Sun, Yinlong; Demerdash, Nabeel A. O.

doi:10.1109/ecce.2019.8912796

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…In [12], the authors used the frequency-domain steady-state equivalent circuit to provide an initialization of the transient FEM solution. In [13], [14] the authors used blocked-rotor frequency-domain FEM to do the same initialization. However, these methods work only if the starting behavior is out of concern.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Phasor Finite-Element Modeling of a DFIG for Grid Connection Studies

Almozayen

Knight

2023

IEEE Open J. Ind. Applicat.

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Co-simulation studies of electric power systems and electric machines have been always a challenge. In order to reduce the simulation time to a reasonable value, lumped-parameter Electric-Machines models are commonly used in electric power system modeling software packages to avoid the heavy computational burden of more accurate modeling methods especially Finite Element Method (FEM) on the expense of less accuracy. The proposed technique in this paper combines the Dynamic Phasor Modeling technique for power system simulations with FEM to accurately model the DFIG while connected to the grid. The utilization of dynamic phasors enables adopting large simulation time-steps resulting in a significant reduction in the simulation time compared to the conventional time-domain FEM modeling. The mathematical foundation of the proposed modeling method is presented including the generator's core saturation. Custom-written C++ codes have been developed by the authors to execute the new dynamic phasor FEM algorithm and the conventional time-domain FEM in order to fairly compare their accuracy and numerical performances. As the proposed method combines time and frequency domains, a unique capability of modeling the rotor movement can be achieved. The rotation can be represented by physically incrementing the rotor and airgap mesh as in regular time-domain solvers, by mathematically representing the rotation using the Virtual Blocked Rotor method as in frequency-domain solvers, and the proposed method of combining the two aforementioned approaches. The three methods of modeling rotor rotation are discussed and their simulation results are compared to give a guide to choose the proper method for the different modeling targets. The results show that the proposed dynamic phasor FEM is capable of producing comparable results to the traditional time-domain solver at a substantially reduced simulation time.

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Section: Introductionmentioning

confidence: 99%

Dynamic Phasor Finite-Element Modeling of a DFIG for Grid Connection Studies

Almozayen

Knight

2023

IEEE Open J. Ind. Applicat.

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“…Some research efforts have been dedicated to shorten the simulation time associated with TS-FEM to facilitate co-simulation studies of machines and power system. In [25], the authors solved the machine's steady-state per-phase equivalent circuit to provide the FEM solver with an initial condition to bypass the starting period while in [26], [27] the authors used frequency-domain FEM to do the same job. In [23] and [28], the authors used FEM to prepare offline flux-current data to be used for online simulation.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Phasor Finite Element Modeling of Grid-Connected DFIG Considering Winding Space Harmonics

Almozayen

Knight

2022

IEEE Access

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This paper presents a new technique for quantifying the winding MMF space harmonics of wind-driven Doubly-Fed Induction Generator (DFIG) for power quality assessments. Instead of following the commercial electromagnetic transient programs in modeling electric machines using lumped-parameters models, the paper uses a combined Dynamic Phase modeling and Finite Element Method (FEM) to model the generator accurately while reducing the computational burden and simulation time associated with the conventional time-stepped finite element analysis. The technique has the ability to efficiently model core nonlinearity and stator/rotor MMF space harmonics. The results of a C++ code written by the authors of the new dynamic phasors FEM technique are compared to the conventional time-stepping FEM to show the capability of the method to produce comparable results in shorter simulation time.

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