Improved Model of Synchronous Generators Internal Faults Based on Circuit-Coupled FEM

Ge, Baojun; Xiao, Shiyong; Liu, Zhihui; Tao, Dajun; Sun, Xiaodong

doi:10.1109/tec.2017.2694883

Cited by 11 publications

(7 citation statements)

References 18 publications

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“…Because of the nonlinearity and time variation of power electronic devices, the traditional analysis methods cannot meet the requirements of static and dynamic analyses. Circuit simulation technology can be used for more accurate research, and when there is a generator in the system, the equivalent model of the generator must be established [20]. In order to facilitate the design of simulation circuit, some simulation software contains generator equivalent model.…”

Section: Numerical Simulation Of Generator's Output Waveformmentioning

confidence: 99%

Research on Output Waveform of Generator with Rectifier Load considering Commutation Overlap Angle

Zhang

Guo

2021

Mathematical Problems in Engineering

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The purpose of this paper is to study the influence of the uncontrolled rectifier circuit on the generator’s output waveform when considering the commutation overlap angle. Taking the nonsalient permanent magnet (PM) generator directly connected with the uncontrolled rectifier circuit as an example, the equivalent circuit of the generator with rectifier load is established, and the commutation process of the rectifier circuit is analyzed when the effect of the commutation overlap angle is considered. The output waveforms of generator’s output side are obtained by analytical method, circuit simulation method, field-circuit coupled simulation method, and experimental method. The validity of the analysis methods is demonstrated by comparison. According to the results of analytical analysis, we know the characteristics of the output waveform under the influence of the commutation overlap angle. The existence of the commutation overlap angle will cause the voltage waveform to concave or convex, prolong the conduction time of the winding, and result in phase difference between the voltage waveform and current waveform. The influence of synchronous inductance and extra inductance on the output waveforms and harmonic distortion rate is analyzed. The research of this paper provides a theoretical basis for improving the output waveform of the generator with rectifier load.

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Section: Numerical Simulation Of Generator's Output Waveformmentioning

confidence: 99%

Research on Output Waveform of Generator with Rectifier Load considering Commutation Overlap Angle

Zhang

Guo

2021

Mathematical Problems in Engineering

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“…It is dangerous and unrealistic to perform the internal fault test of such a large capacity generator, since the fault current can result in severe damages to the generators and even to the experimental platform. The accuracy of the FE model for simulating internal faults in synchronous generators has been experimentally verified in [16, 18]. Therefore, in order to verify the validity of the multi‐loop model of fractional pole‐path ratio synchronous generators, the comparison of simulation results are made between the multi‐loop model and the FE model.…”

Section: Simulation Of the Internal Faults Of Fractional Pole‐path Ramentioning

confidence: 99%

“…The influences of high‐order space harmonics, non‐uniform air gap, and core non‐linearities on the simulation results of the FE model can be taken into account. In [18], an improved model based on FE method is proposed, where the localised model of each stator coil is established as per its actual structure. The short‐circuit fault occurring inside the coil can be accurately simulated, and the simulation results are verified by comparison with experimental results.…”

Section: Introductionmentioning

confidence: 99%

Multi‐loop model for fractional pole‐path ratio synchronous generators with stator winding internal faults

Xiao

Liu

et al. 2020

IET Electric Power Applications

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Fractional pole‐ratio winding is a new type of AC winding, consisting of coils with different pitches. The application of fractional pole‐path ratio windings in synchronous generators will bring new problems to the modelling and simulation of internal faults. It is important to establish a mathematical model for the fractional pole‐path ratio synchronous generators with internal faults and accurately calculate the fault currents. In this study, the multi‐loop model of fractional pole‐path ratio synchronous generators is first proposed. The method for calculating mutual inductances between stator coils with arbitrary pitch is given, and all the space harmonics, including the fractional ones, are considered in the inductance calculation. In order to improve the simulation accuracy of turn‐to‐turn faults, the effect of core localised saturation is modelled by modifying the air gap function of fault coils. A 300 MW fractional pole‐path ratio synchronous generator is set as an example, and three types of internal faults are simulated. The comparisons of simulation results are made between the multi‐loop model and the finite element model to verify the validity of the multi‐loop model proposed in this study.

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“…As for other fault modelling methods such as a magnetic equivalent circuit [17,18] and finite element analysis (FEA) [19][20][21], they are quite time-consuming particularly the FEA for large-power electrical machines under the ITSC fault. This is mainly because, due to the large numbers of slots and poles, full FE models required for large-power SPM machines with ITSC faults often have much more mesh elements, and are hence much more time consuming to solve.…”

Section: Introductionmentioning

confidence: 99%

In‐depth investigation of inter‐turn short‐circuit faults of surface‐mounted permanent magnet machines with series‐parallel coil connections

Mei

Zhu

et al. 2023

IET Electric Power Appl

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A general analytical model is developed in a concise block matrix form for surface‐mounted permanent magnet (SPM) machines with series‐parallel coil connections under inter‐turn short circuit (ITSC) fault. In the model, branch currents are used as state variables and inductances of different series‐parallel coil connections are calculated using an analytical method, namely winding function approach (WFA) together with slot permeance method. Based on the characteristics of the calculated inductances and the developed fault model, the multiphase Clarke transformation has been proposed to simplify the fault model. In the process of model simplification, the healthy machine model using branch currents as state variables have been proven to be equivalent to that using 3‐phase currents as state variables. The proposed fault models of a 3kW 96‐slot 32‐pole SPM machine with different series‐parallel coil connections have been built in Matlab/Simulink and validated by time‐stepping 2D FE simulations. Simulation results show that different series‐parallel coil connections have little influence on the amplitude of the ITSC current. Finally, a small scale 24‐slot 8‐pole SPM machine prototype has been built to further validate the accuracy of the proposed fault model.

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Improved Model of Synchronous Generators Internal Faults Based on Circuit-Coupled FEM

Cited by 11 publications

References 18 publications

Research on Output Waveform of Generator with Rectifier Load considering Commutation Overlap Angle

Research on Output Waveform of Generator with Rectifier Load considering Commutation Overlap Angle

Multi‐loop model for fractional pole‐path ratio synchronous generators with stator winding internal faults

In‐depth investigation of inter‐turn short‐circuit faults of surface‐mounted permanent magnet machines with series‐parallel coil connections

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