Design and Performance Study of a Brushless Doubly Fed Generator Based on Differential Modulation

Cheng, Yongjun; Yu, Bo; Kan, Chaohao; Wang, Xuefan

doi:10.1109/tie.2019.2962430

Cited by 17 publications

(7 citation statements)

References 20 publications

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“…In doubly fed synchronous operation (motoring or generating), the rotor speed is determined by the frequency and pole pairs of SW1 and SW2. There are two scenarios to maintain synchronous operation, that is, sum modulation and difference modulation [7,12,[23][24] . (1) Sum modulation: When the rotor speed satisfies ω r =(ω 1 +ω 2 )/(p 1 +p 2 ), where ω 2 is the electrical angular frequency of SW2 and p 2 is the number of pole pairs of SW2, the number of antinodes of the resultant stator MMF wave in the air gap equals the summation of the two winding pole pairs, as shown in Fig.…”

Section: Stator Mmfmentioning

confidence: 99%

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Analytical analysis and performance characterization of brushless doubly fed induction machines based on general air-gap field modulation theory

Han

Cheng

Zhu

et al. 2021

Chin. J. Electr. Eng.

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Air-gap magnetic field modulation has been widely observed in electric machines. In this study, we present an analytical analysis and performance characterization of brushless doubly fed induction machines (BDFIMs) fed by two independent converters from the perspective of air-gap field modulation. The spiral-loop winding is studied in detail as an example to show the generalized workflow that can also be used to analyze other short-circuited rotor winding types, such as nested-loop and multiphase double-layer windings. Magnetic field conversion factors are introduced to characterize the modulation behavior of special rotor windings and facilitate their comparison in terms of cross-coupling capability, average torque, and harmonic content of the air-gap flux density waveforms. The stator magnetomotive force (MMF), rotor MMF, and resultant air-gap MMF are considered, based on which the closed-form inductance formulas are derived, and the torque equation is obtained along with the optimal current angle for maximum torque operation by using the virtual work principle. The design equations are then developed for the initial sizing and geometry scaling of the BDFIMs. Transient finite element analysis and experimental measurements are performed to validate the analysis.

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Section: Stator Mmfmentioning

confidence: 99%

“…This confirms the three-dimensional (3-D) visualizations of FEA results from the previous literature, for example, Refs. [13,24], but with much reduced computational effort. The color in the figure denotes the instantaneous value of the stator MMF.…”

Section: Stator Mmfmentioning

confidence: 99%

Analytical analysis and performance characterization of brushless doubly fed induction machines based on general air-gap field modulation theory

Han

Cheng

Zhu

et al. 2021

Chin. J. Electr. Eng.

View full text Add to dashboard Cite

show abstract

“…So, the rotor should produce two magnetic fields with different pole pairs at the same time. Existing rotor types include reluctance rotor, nested-loop cage rotor and wound rotor [13][14][15][16][17][18][19][20][21]. These structures can modulate the magnetic motive force (MMF) of the rotor by adjusting the rotor reluctance or regulating the rotor currents.…”

Section: Operation Principle Of the Pulsed Bdfamentioning

confidence: 99%

“…However, the existing research studies on the pulsed BDFA mainly focus on the theoretical simulation, lacking the analysis of parameters which affect the charging performance of the pulsed BDFA in the CCPS system, and have no experimental analysis of the prototype [8,9]. Besides, the conventional BDFA research does not consider the particularity of pulse occasions and cannot be directly applied to the CCPS system [13][14][15][16]. For the CCPS system, the main goal is higher charging voltage and faster charging time.…”

Section: Introductionmentioning

confidence: 99%

Design and transient experimental analysis of a pulsed brushless doubly fed alternator in a capacitor charge power supply system

Zhao

Xie

et al. 2021

IET Electric Power Appl

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There is an urgent need to develop a robust capacitor charge power supply (CCPS) system to meet the requirement of pulsed load in all‐weather mobile occasions such as vehicle, ship and aircraft. Brushless doubly fed alternator (BDFA) works through the rotor's pole pairs' transformation to get excitation indirectly, without magnets, brushes and slip rings. Both DC and AC excitation can be used. Therefore, it has high reliability and a good application prospect in the CCPS system. However, the existing research studies lack analysis of the parameters that affect charging performance, and have no experimental analysis of the prototype. To solve this problem, a comprehensive design method and experimental procedure of the pulsed BDFA are proposed and investigated. First, the operation principle of the pulsed BDFA is illustrated. Then, the charging performances under different design schemes are comparatively analysed through the finite element analysis (FEA). Finally, a prototype of the pulsed BDFA is manufactured, and the related experiments are carried out. The results verify the feasibility of the experimental procedure and the accuracy of FEA. The comprehensive design method and experimental procedure in this work provide a straightforward reference for the subsequent applications in the CCPS system.

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“…Although Robert P. C. reported in (Roberts, 2004) that the rotor leakage inductance can be declined when the appropriate design method is adopted, there is little hope of success for the nested-loop and the reluctance rotors (Li et al, 2019). To solve the problem of the excessive harmonics of the rotor, Cheng Y. utilized the special design method for the wound rotor to reduce the harmonic content (Cheng et al, 2020). The reasonable wound winding design indeed can reduce the rotor harmonics, however, the high rotor resistance is a prevalent obstacle that the wound rotor usually experiences, leading to high copper loss.…”

Section: Introductionmentioning

confidence: 99%

Design Method of Differential Cascading for Dual-Stator Brushless Doubly-Fed Induction Wind Generator With Staggered Dual Cage Rotor

et al. 2021

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This article proposes a new differential-cascading-based dual-stator brushless doubly-fed induction machine with a staggered dual cage rotor. Conventional differential mode of the brushless doubly-fed machine with cage rotor suffers from the low number of rotor bars because of the low equivalent synchronous pole pairs of |p1-p2|, and thus, severe rotor flux leakage, low capacity of magnetic field conversion of the rotor and low efficiency. To overcome the obstacle of the excessive harmonics of the rotor, a design method based on the differential cascading is proposed which enables the cage rotor with a high number of conductor bars even in the case of low pole pairs of |p1-p2|, hence the greatly reduced rotor leakage inductance and enhanced performance of the machine. The rotating magneto-motive force theory is applied to derive the interconnection rule of the staggered dual cage rotor, and meanwhile, the corresponding examples are illustrated. The performance comparisons between the differential cascading and the sum cascading based on the proposed machine are carried out. The results show that the proposed machine based on the differential cascading obtains higher power densities comparing to the sum cascading at the region of sub-natural synchronous speed, while its drawback is the increment of the loss due to the high rotor frequency, gaining lower efficiencies at the region of super-natural synchronous speed.

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Design and Performance Study of a Brushless Doubly Fed Generator Based on Differential Modulation

Cited by 17 publications

References 20 publications

Analytical analysis and performance characterization of brushless doubly fed induction machines based on general air-gap field modulation theory

Analytical analysis and performance characterization of brushless doubly fed induction machines based on general air-gap field modulation theory

Design and transient experimental analysis of a pulsed brushless doubly fed alternator in a capacitor charge power supply system

Design Method of Differential Cascading for Dual-Stator Brushless Doubly-Fed Induction Wind Generator With Staggered Dual Cage Rotor

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