T‐type direct AC/AC converter structure

Khodabandeh, Masih; Zolghadri, Mohammad Reza; Shahbazi, Mahmoud; Noroozi, Negar

doi:10.1049/iet-pel.2015.0151

Cited by 17 publications

(7 citation statements)

References 36 publications

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“…The three-phase bridge rectifier circuit shown in Figure 1 illustrates the "phase hopping" frequency conversion method [9]. The circuit structure is identical to that used in the conventional no circulating current AC/AC frequency conversion circuit [10]. The bridge rectifier circuit comprises six thyristors (i.e.…”

Section: Basic Principle Of the "Phase Hopping" Frequency Conversionmentioning

confidence: 99%

Thyristor-based “phase hopping” frequency conversion technique

Xu¹,

Zhang²,

Yi³

et al. 2019

Turk J Elec Eng & Comp Sci

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This study proposes a new AC/AC "phase hopping" frequency conversion method based on the analyses of the disadvantages of the conventional cosine wave-crossing method. The advantages of this new method include no circulating current, no dead time, and an output frequency close to the power frequency. This study also introduces the basic principles of the "phase hopping" method and analyzes these principles combined with the voltage phase-changing comparison to that of the cosine wave-crossing method. The "phase hopping" principles are used to analyze the generation of thyristor trigger pulses, including the generation time and duration. A simulation is conducted in MATLAB, and the simulation output waveform and harmonic analysis results are then obtained. The proposed approach is verified on an experimental platform. Consequently, the results are in good agreement with those of the theoretical and simulation analyses.

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Section: Basic Principle Of the "Phase Hopping" Frequency Conversionmentioning

confidence: 99%

Thyristor-based “phase hopping” frequency conversion technique

Xu¹,

Zhang²,

Yi³

et al. 2019

Turk J Elec Eng & Comp Sci

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“…The typical ac-ac converter topologies can be categorised into three groups: (i) indirect ac-dc-ac converters with a dc-link capacitor [1]; (ii) matrix converters [2][3][4]; (iii) direct pulse-width modulated (PWM) ac-ac converters [5][6][7]. Among them, direct PWM ac-ac converters are more feasible solutions for applications requiring only voltage regulation, due to their single-stage power conversion with simple topology and control [5].…”

Section: Introductionmentioning

confidence: 99%

“…Among them, direct PWM ac-ac converters are more feasible solutions for applications requiring only voltage regulation, due to their single-stage power conversion with simple topology and control [5]. Under this motivation, there is a significant interest in circuit development [5,[7][8][9][10][11] of direct ac-ac converters. Various conventional topologies of single-phase direct ac-ac converters are proposed in [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Under this motivation, there is a significant interest in circuit development [5,[7][8][9][10][11] of direct ac-ac converters. Various conventional topologies of single-phase direct ac-ac converters are proposed in [7][8][9][10][11]. Nevertheless, the buck and boost type converters suffer from limited gain ranges, while the buck-boost type converters experience high voltage and current stresses.…”

Section: Introductionmentioning

confidence: 99%

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Family of single‐phase isolated high‐frequency transformer integrated improved magnetically coupled Z‐source ac–ac converters

Ahmed

Moursi

Irshad³

et al. 2020

IET Power Electronics

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This study proposes single-phase improved coupled-inductor (CL) Z-source (ZS) ac-ac converters with integrated high-frequency transformer (HFT) isolation. They can provide wide range of buck-boost voltage with same/reversed phase angle, similar to the existing ZS ac-ac converters. Meanwhile, integrating a HFT with CL in proposed converters benefit in twofold: (i) the CL enhances the voltage gain, which in turn reduces the voltage stresses/ratings of active switches. Moreover, the turns ratio of CL add another degree of freedom to gain adjustment beside the duty ratio; (ii) the HFT (20 kHz) is integrated with CL by adding only one winding to the same magnetic core, which provides electrical isolation for applications such as dynamic voltage restore, saving extra bulky line frequency (60 Hz) transformer. In addition, the proposed converters provide both continuous input/output currents. The commutation strategy is also implemented to eliminate the switch voltage spikes. A proposed HFT isolated improved three-winding Δ-CL ZS (Δ-ZS) ac-ac converter is introduced at first, and its operation, circuit analysis and component design/selection are discussed in detail along with comparisons with counterpart converters. Various different CL structures based proposed HFT isolated ZS ac-ac converters are presented afterwards. Experimental results on 200 W prototype converter are provided finally to verify their merits.

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“…Compared with the general AC-DC-AC converter, AC-AC converter has the advantages of high conversion efficiency [3], especially in the case of small operation speed and very large power. However, its application is subject to limitation [4], [5] to an extent due to its low power factor, high harmonic content, low output frequency [6], [7], narrow range of variation and large number of components used.…”

Section: Introductionmentioning

confidence: 99%

Practicability Research on “Phase-Hopping” AC–AC Frequency Conversion Technology

Jiang

2020

IEEE Access

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The ''Phase-Hopping'' AC-AC frequency conversion technology proposed on the basis of traditional technology has the advantages of no circulating current, no dead zone and output frequency that can be improved to close to the power frequency. However, the research on this technology at present is still limited to the low voltage level, and problems such as low system capacity and high harmonic wave still exist, which cannot be applied in practice. To this end, a three-phase series-connected six-fold ''phasehopping'' AC-AC frequency conversion main circuit is designed on the basis of traditional series-connected multiple technology, which addresses the voltage withstanding problem of thyristors, reduces harmonic content and enlarges system capacity, and the circuit is simulated by MATLAB. Furthermore, a singlephase series-connected six-fold ''phase-hopping'' AC-AC frequency conversion experiment platform is set up, which includes the key main circuit and the trigger circuit and improves its synchronous detection circuit. The simulation and experimental results are consistent with the theoretical analysis. In view of the technical transformation of ''phase-hopping'' AC-AC frequency conversion of common high-voltage and large-capacity pump station motors, the main circuit is designed, the model selection of thyristor is conducted, and the cost estimation of frequency converter is carried out. The analysis shows that the system has a high cost performance, thus it can be seen that this technology has a broad practical application prospect. INDEX TERMS AC-AC frequency conversion, high voltage, large capacity, MATLAB.

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T‐type direct AC/AC converter structure

Cited by 17 publications

References 36 publications

Thyristor-based “phase hopping” frequency conversion technique

Thyristor-based “phase hopping” frequency conversion technique

Family of single‐phase isolated high‐frequency transformer integrated improved magnetically coupled Z‐source ac–ac converters

Practicability Research on “Phase-Hopping” AC–AC Frequency Conversion Technology

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