Phase-shifting transformers of round shape used for multi-module inverters

Wang, Zhihui; Fang, Fang; Xiaoyi, Jiang; Xiang, Rong

doi:10.1109/isie.2012.6237130

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…To address these problems, the multiple superposition inverter technique can be used to eliminate the harmonics of the inverter system. Multi-stack inverter technology is an effective way to expand inverter capacity by superimposing the output of multiple inverters through phase shifting transformers to achieve high voltage output while offsetting harmonics of opposite phase, thus increasing the inverter capacity and improving the output waveform [16][17][18][19]. The multi-stack inverter technique does not have the problem of voltage balancing and has simple control and high reliability [20].…”

Section: Introductionmentioning

confidence: 99%

Harmonic Analysis and Cancellation of Inverter Systems with Linear Phase‐Shifting Transformer

Zhou,

Zhao,

Wang

et al. 2023

IEEJ Transactions Elec Engng

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In order to improve the electrical performance of the inverter system and make its output waveform close to a sinusoidal waveform, an inverter based on a linear phase‐shifting transformer is proposed, which can eliminate the low harmonics with opposite phase by the effect of phase shift and superposition. Firstly, the components and working process of the multiple superposition inverter system are introduced, and the working principle and winding structure of the linear phase‐shifting transformer are analyzed; Secondly, the Fourier decomposition of the inverter output voltage is carried out to obtain the harmonic currents at the same frequency as it, and it is demonstrated that the inverter is capable of eliminating most of the harmonics below the 23rd order by calculating the magneto‐dynamic potential synthesized in the air gap; Again, in order to overcome the harmonic electric potential caused by the edge‐end effect and the tooth slot structure of the linear phase‐shifting transformer, the secondary side winding of the linear phase‐shifting transformer adopts a short pitch structure, and it is proved that this structure has a significant suppression effect on the 5th and 7th harmonics without reducing the fundamental wave amplitude; Then, the model of multiple superposition inverter system is built based on Maxwell simulation software, and the effectiveness of the inverter device and winding structure on harmonic suppression is proved through spectral analysis of voltage waveforms with different load types and power factors; Finally, its reasonableness and accuracy are verified by experiments. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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Section: Introductionmentioning

confidence: 99%

Harmonic Analysis and Cancellation of Inverter Systems with Linear Phase‐Shifting Transformer

Zhou,

Zhao,

Wang

et al. 2023

IEEJ Transactions Elec Engng

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“…Phase-shifting transformers are an integral part of multiplexed inverters and multi-pulse rectifiers, which can effectively reduce the harmonic content and optimize the output performance of large-capacity power conversion systems. According to the structural classification, phase shift transformers can be classified into three types: core-and-pillar, circular, and linear phase shift transformers [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Multi‐Objective Optimization Design of Linear Phase Shift Transformer Based on Improved Differential Evolutionary Algorithm

Zhou

Zhao

Wang

et al. 2023

IEEJ Transactions Elec Engng

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Linear phase shifting transformer is a new type of phase shifting transformer with the advantages of simple winding structure, easy modularity, and the ability to shift phase at any angle. In order to improve the efficiency and power factor of linear phase shift transformer and reduce the weight of the body, based on the equivalent circuit, this paper first, selects the main design parameters of the linear phase shift transformer model as the optimization object, secondly, selects the constraints and objective function applicable to this model, and then, establishes the linear phase shift transformer optimization design model. Finally, a differential evolutionary algorithm with strong global search performance is used to optimize the design parameters. Taking the 1 kW linear phase shifting transformer as an example, the efficiency, power factor, and weight before and after optimization are compared using finite element simulation to verify the effectiveness of the proposed optimization method. The test results of the experimental prototype prove that the proposed method can effectively solve the optimization design problem of linear phase shifting transformers. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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