Topologies and Control Strategies of Cascaded Bridgeless Multilevel Rectifiers

Wang, Cong; Zhuang, Yuan; Jiao, Jian; Zhang, Heng; Wang, Chang; Cheng, Hong

doi:10.1109/jestpe.2016.2626788

Cited by 43 publications

(29 citation statements)

References 22 publications

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“…γ = 2arctan ωLI sm U sm (8) Therefore, the piecewise function of the input current in a power frequency cycle is expressed as…”

Section: Distortion Characteristics Of Input Current Under Unity Powementioning

confidence: 99%

“…However, in many practical applications, including speed regulation with fan type loads, wind power integration, and plug-in electrical vehicle applications, only unidirectional power flow is required. In these situations, some fully controlled switches can be eliminated or replaced to simplify the system, which greatly reduces the complexity of system, saves costs, and improves the system reliability [8,9]. Taking these considerations into account, many researchers have investigated the possibility of incorporating reactive power compensation (RPC) and harmonic current compensation (HCC) functionalities into general unidirectional power converters [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Analysis to Input Current Zero Crossing Distortion of Bridgeless Rectifier Operating under Different Power Factors

Liu

Zhuang

et al. 2018

Energies

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The principles and operating characteristics of bridgeless rectifiers under different power factors are discussed with emphasis on analyzing the input current distortion. Firstly, two driving modes are analyzed and compared. Based on the results of comparison it is concluded that the complementary drive mode is a better choice in terms of reducing the current distortion when bridgeless rectifier operates on non-unity power factor. Then, the mechanism causing input current zero-crossing distortion is analyzed. The input current during the distortion is expressed by the piecewise function when a bridgeless rectifier operates under complementary drive mode. Based on the piecewise function, the harmonic analysis is performed. Besides, the relationships between the input current Total Harmonic Distortion (THD) and the filtering inductance, the input current amplitude and the power factor angle are also investigated, which is useful when designing bridgeless rectifiers and selecting the corresponding parameters. Finally, the accuracy of the theoretical analysis is verified through the simulation and experiment.

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“…γ = 2arctan ωLI sm U sm (8) Therefore, the piecewise function of the input current in a power frequency cycle is expressed as…”

Section: Distortion Characteristics Of Input Current Under Unity Powementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis to Input Current Zero Crossing Distortion of Bridgeless Rectifier Operating under Different Power Factors

Liu

Zhuang

et al. 2018

Energies

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“…However, the TCMC mentioned above utilizes too many fully-controlled power switches (such as IGBTs or MOSFETs), making its main circuit and control system more complicated with higher cost and lower reliability. Considering that in many practical applications, bidirectional power flow is not always necessitated, such as in the Alternating Current (AC) speed regulation systems with pumps or fans load, etc., some researchers believe that in these applications, it might be a better choice to take the unidirectional rectifier like diode H-bridge cascaded boost rectifier, cascaded bridgeless rectifier and cascaded VIENNA rectifier as the front stage of TCMC [8][9][10][11][12]. The authors of [9] investigated the possibility of using the cascaded bridgeless rectifier to construct the front stage of TCMC.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Comprehensive Comparison of H-Bridge-Based Bidirectional Rectifier and Unidirectional Rectifiers

et al. 2020

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This paper presents an evaluation and comprehensive comparison for the topologies which are applied to the front stage of transformer-less cascaded multilevel converter (TCMC). The topologies investigated are targeted at the bidirectional cascaded H-bridge rectifier and three unidirectional rectifiers, including the diode H-bridge cascaded boost rectifier, cascaded bridgeless rectifier and cascaded VIENNA rectifier. First, the operation principles of the unidirectional rectifiers are discussed. Then the performances of these topologies such as power losses, efficiency, device current stress, cost, and total harmonic distortions are analyzed and evaluated respectively. Finally, advantages and disadvantages for each topology are discussed and highlighted. The evaluation and comparison methods presented in this paper and their results are feasible and effective for selecting the appropriate topology in practical applications under different operating conditions.

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“…Incorporating RPC function into conventional unidirectional power converters means the phase angle of the input current of the converter with regard to the source voltage should be able to be shifted in leading or lagging freely. However, because of the unidirectional power flow characteristic of the converter, the input current distortion appears whenever the polarity of the AC side current and voltage of the rectifier become opposite [4,9]. This means that, the larger the phase angle, the higher the input current distortion would be.…”

Section: Introductionmentioning

confidence: 99%

A Modified One-Cycle Control for Vienna Rectifiers with Functionality of Input Power Factor Regulation and Input Current Distortion Mitigation

et al. 2019

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In this paper, aiming at incorporating reactive power compensation functionality into the Vienna rectifiers, a modified one-cycle-control (MOCC) strategy is proposed by which the three-phase Vienna rectifier can be regulated in leading, lagging or unity power factors with near-sinusoidal input current waveform. First, a brief review of the working principle of the conventional OCC (COCC) strategy is conducted. Then, the MOCC strategy with the functionality of input current phase-shift control is discussed in detail. To mitigate input current distortion caused by the current phase-shift, a method whereby the signal of one phase current which is flowing in an uncontrollable region is injected into the other two phases' current command signals is further presented. The constraints to the implementation of the MOCC scheme and the reactive power compensation capacity of the rectifier under MOCC control are analyzed as well. The proposed MOCC strategy is as easy to implement as the COCC strategy. Moreover, the MOCC strategy also preserves all other advantages of the COCC strategy, such as no phase-locked loop, no frame transformation and constant switching frequency. Finally, the theoretical analysis of the proposed MOCC strategy is fully verified by simulation and experimental results from a 1 kV·A three-phase Vienna rectifier prototype.

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Topologies and Control Strategies of Cascaded Bridgeless Multilevel Rectifiers

Cited by 43 publications

References 22 publications

Analysis to Input Current Zero Crossing Distortion of Bridgeless Rectifier Operating under Different Power Factors

Analysis to Input Current Zero Crossing Distortion of Bridgeless Rectifier Operating under Different Power Factors

Evaluation and Comprehensive Comparison of H-Bridge-Based Bidirectional Rectifier and Unidirectional Rectifiers

A Modified One-Cycle Control for Vienna Rectifiers with Functionality of Input Power Factor Regulation and Input Current Distortion Mitigation

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