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

Liu, Jinqi; Liu, Yizhou; Zhuang, Yuan; Wang, Cong

doi:10.3390/en11092447

Cited by 10 publications

(6 citation statements)

References 18 publications

(19 reference statements)

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“…However, due to the unidirectional power flow, the polarity of input current i s should be the identical to the AC voltage u con , so u con can only generate a zero AC voltage during the period of θ. After u* con changes from negative to positive, i s can follow i* s after a period of γ [12,27]. The distortions of the input current will become more severe while the leading or lagging angle is increased, so the controllability angle for unidirectional rectifier is limited.…”

Section: Thd Analysis Of Input Currentmentioning

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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Section: Thd Analysis Of Input Currentmentioning

confidence: 99%

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

et al. 2020

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“…However, due to the unidirectional power flow property, the node voltage u AN and the phase input current i A must always remain in the same polarity. Hence, during the period of ϕ 2 , the best choice for node voltage u AN is to keep it at zero value [5,23], which makes the input current i A become uncontrollable, if no suitable control is applied in this uncontrollable region, the input current distortion in Phase A will appear as shown in Figure 6c. Furthermore, the distorted i A will further distort the input currents in another two phases at the same time.…”

Section: Mechanism Of Causing Input Current Distortionmentioning

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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“…Below, this mode is defined as the hybrid cascaded rectifier mode, which is not only able to achieve active power transmission, but also still provide continuous leading to lagging reactive power. However, due to the unidirectional characteristics of the bridgeless mode in the faulty modules, the input current will become distorted [23,24], resulting in the limited reactive power [25]. Therefore, in the case where the reactive power is required, it is imperative to calculate the adjustable power factor angle to provide a basis for switching to the proposed hybrid rectifier operating mode.…”

Section: Introductionmentioning

confidence: 99%

Open-Circuit Fault-Tolerant Design of the Cascaded H-Bridge Rectifier Incorporating Reactive Power Compensation

et al. 2020

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This paper proposes an open-circuit fault-tolerant design for the cascaded H-Bridge rectifier incorporating reactive power compensation. If one or two switching devices of the H-bridge modules are fault, the drive signals of the faulty H-bridge modules will be artificially redistributed into the bridgeless mode (including the boost bridgeless mode, the symmetric boost bridgeless mode, the totem-pole bridgeless mode and the symmetry totem-pole bridgeless mode) and cooperate with the normally operated H-bridge modules. In this case, the faulty cascaded H-bridge rectifier is not only able to achieve active power transmission, but also can still provide part of reactive power compensation when injecting reactive power from the power grid. Nonetheless, the reactive power that it can supply will be limited, due to the unidirectional characteristics of the bridgeless mode for the faulty modules. Therefore, a method for calculating its adjustable power factor angle range is also presented, which provides the basis for the faulty modules switching to the bridgeless mode. Then, a control strategy of the cascaded H-bridge rectifier incorporating reactive power compensation under the faulty condition and normal operation is presented. Finally, an experimental platform with a single-phase cascaded H-bridge rectifier containing three cells is given to verify the proposed theories.

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

Cited by 10 publications

References 18 publications

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

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

Open-Circuit Fault-Tolerant Design of the Cascaded H-Bridge Rectifier Incorporating Reactive Power Compensation

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