Brushless Doubly Fed Machine Design Evaluation With Power Factor Considerations

Olubamiwa, O. I.; Hutton, T.; Gule, Nkosinathi

doi:10.1109/tia.2022.3217750

Cited by 6 publications

(2 citation statements)

References 41 publications

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“…BDFMs could be endowed with more freedom in speed and power control, inherent fault tolerance, and high reliability. They typically have different rotor topologies, including salient pole reluctance (SPR) [1][2][3], magnetic barrier reluctance [4][5][6], and short-circuit coils [7][8][9], each exhibiting different conversion efficiency and output characters. As another option, the BDFM can also function as a magnetic fieldmodulated machine based on the airgap field modulation theory [10], where the rotor introduced above serves as a modulator and provides indirect magnetic coupling between the two stator windings.…”

Section: Introductionmentioning

confidence: 99%

Evolution and optimization of a brushless doubly‐fed machine with an asymmetrical reluctance and magductance rotor

Long,

Wen,

Shuai

et al. 2023

IET Renewable Power Gen

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The brushless doubly‐fed machine (BDFM) utilizes an asymmetric composite rotor featuring salient pole reluctance and magductance to effectively compensate for the phase shift in space, as well as enhance magnetic field modulation effects, and is therefore used as a modulator. This paper evaluates the modulation capability of the modulator from the perspective of the magnetic field conversion mechanism. The theoretical evolutions of the average magnetic field conversion factors and torque contributions of various airgap field harmonics are accomplished. Additionally, multi‐objective optimization is conducted for better performance, using stratified sensitivity analysis on typical 4/2 pole pair BDFMs featuring symmetrical and asymmetric composite rotors. As a result, further improved modulation of the air gap magnetic field is expected, the cross‐coupling efficiency of the rotor is improved, and a lower output torque ripple is also achieved compared to the conventional symmetrical counterpart. Theoretical investigation of the optimized BDFM, including its effectiveness in enhancing performance metrics such as coupling factor, airgap flux density, and phase shift mechanism, is verified through 2D finite element analysis. Furthermore, a proof‐of‐concept prototype for experimentation was manufactured, which achieved good agreement with the theoretical predictions.

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Section: Introductionmentioning

confidence: 99%

Evolution and optimization of a brushless doubly‐fed machine with an asymmetrical reluctance and magductance rotor

Long,

Wen,

Shuai

et al. 2023

IET Renewable Power Gen

View full text Add to dashboard Cite

show abstract

“…In DFIG, the main set of windings is placed on the stator, while the other set of windings is placed on the rotor and connected to the power converter using slip rings and brushes. Alternatively, brush-less DFIG [4] or brushless doubly fed reluctance generator (DBFRG) [5] could be used. In Type-4 systems, the generator has only one set of three-phase windings connected to the grid through a power electronics converter which must be rated to handle the full power of the WECS.…”

Section: Introductionmentioning

confidence: 99%

Optimal Gearbox Ratio to Minimize the Power Converter Ratings in DFIG-Based Type-3 Wind Turbines

Hussain

2023

IEEE Access

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Type-3 wind turbines based on the doubly-fed induction generator with a partial-scale power converter are commonly implemented in wind energy conversion systems. This paper investigates the effects of the rated slip and, thus, the gearbox ratio of the wind turbine on the ratings of the partial-scale power converter. Three design methods are proposed to select the optimal rated slip and gearbox ratio. The first design method minimizes the converter's rated power compared to the system's rated power. The analysis showed that a rated slip of −11.84% will minimize the converter ratings. The second design method is based on selecting the rated current of the converter, while the third design method aims to maximize the power produced at low wind speeds. The three proposed design methods are analyzed and compared to the conventional design method for a 2 MW wind energy conversion system. Simulation results for the complete system were performed where the dynamics in the wind speed and the thermal model of the Silicon-Carbide MOSFET power converter are considered. The simulation results verified the effectiveness of the proposed methods. Using the first proposed method, the power converter rating is only around 10% of the rated power. The third proposed method can be used to maximize the power produced at low wind speeds to maximize the annual energy production.INDEX TERMS Doubly fed induction generators, partial-scale power converters, power electronics, wind energy conversion systems.

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DFIG-Based WECS With Partial-Scale Converter: Efficiency, Cost, and Volume Comparison of SiC-Based and IGBT-Based Converter Solution

Hussain,

Loncarski,

Ristic

et al. 2024

IEEE Access

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Brushless Doubly Fed Machine Design Evaluation With Power Factor Considerations

Cited by 6 publications

References 41 publications

Evolution and optimization of a brushless doubly‐fed machine with an asymmetrical reluctance and magductance rotor

Evolution and optimization of a brushless doubly‐fed machine with an asymmetrical reluctance and magductance rotor

Optimal Gearbox Ratio to Minimize the Power Converter Ratings in DFIG-Based Type-3 Wind Turbines

DFIG-Based WECS With Partial-Scale Converter: Efficiency, Cost, and Volume Comparison of SiC-Based and IGBT-Based Converter Solution

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