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Jinqi Liu
School of Mechanical Electronic & Information Engineering, China University of Mining & Technology, Beijing 100083, China

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Journal article
Published: 20 May 2020 in IEEE Access
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A research study on a type of cascaded single-phase VIENNA converter (CSVC) is presented in this paper. And a type of DC voltage balancing control strategy for each cascaded module of the CSVC based on improved one-cycle control (I-OCC) is proposed, in which voltage balancing signals are added to the conventional OCC (C-OCC) control loop to cause a difference in the modulation signals of each of the cascaded modules, so that the DC voltages of all modules can be quickly balanced under unbalanced loads. At the same time, the average modulation wave maintains a constant value so that the CSVC achieves a unity power factor operation. The operating principle of the I-OCC strategy is discussed in detail, and the corresponding mathematical relationships are derived. In the proposed strategy, the ability to adjust the DC voltages is also analyzed. Finally, the simulation and experiment results are provided to verify the validity and feasibility of this I-OCC-based voltage balancing control strategy. The control strategy proposed by this paper is also applicable to all other cascaded unidirectional rectifiers.

ACS Style

Cong Wang; Haoyu Hu; Hong Cheng; Zhihao Zhao; Jinqi Liu. Voltage Balancing Control of Cascaded Single-Phase VIENNA Converter Based on One Cycle Control With Unbalanced Loads. IEEE Access 2020, 8, 95126 -95136.

AMA Style

Cong Wang, Haoyu Hu, Hong Cheng, Zhihao Zhao, Jinqi Liu. Voltage Balancing Control of Cascaded Single-Phase VIENNA Converter Based on One Cycle Control With Unbalanced Loads. IEEE Access. 2020; 8 (99):95126-95136.

Chicago/Turabian Style

Cong Wang; Haoyu Hu; Hong Cheng; Zhihao Zhao; Jinqi Liu. 2020. "Voltage Balancing Control of Cascaded Single-Phase VIENNA Converter Based on One Cycle Control With Unbalanced Loads." IEEE Access 8, no. 99: 95126-95136.

Journal article
Published: 02 September 2019 in Energies
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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.

ACS Style

Cong Wang; Jinqi Liu; Hong Cheng; Yuan Zhuang; Zhihao Zhao. A Modified One-Cycle Control for Vienna Rectifiers with Functionality of Input Power Factor Regulation and Input Current Distortion Mitigation. Energies 2019, 12, 3375 .

AMA Style

Cong Wang, Jinqi Liu, Hong Cheng, Yuan Zhuang, Zhihao Zhao. A Modified One-Cycle Control for Vienna Rectifiers with Functionality of Input Power Factor Regulation and Input Current Distortion Mitigation. Energies. 2019; 12 (17):3375.

Chicago/Turabian Style

Cong Wang; Jinqi Liu; Hong Cheng; Yuan Zhuang; Zhihao Zhao. 2019. "A Modified One-Cycle Control for Vienna Rectifiers with Functionality of Input Power Factor Regulation and Input Current Distortion Mitigation." Energies 12, no. 17: 3375.

Journal article
Published: 14 September 2018 in 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.

ACS Style

Jinqi Liu; Yizhou Liu; Yuan Zhuang; Cong Wang. Analysis to Input Current Zero Crossing Distortion of Bridgeless Rectifier Operating under Different Power Factors. Energies 2018, 11, 2447 .

AMA Style

Jinqi Liu, Yizhou Liu, Yuan Zhuang, Cong Wang. Analysis to Input Current Zero Crossing Distortion of Bridgeless Rectifier Operating under Different Power Factors. Energies. 2018; 11 (9):2447.

Chicago/Turabian Style

Jinqi Liu; Yizhou Liu; Yuan Zhuang; Cong Wang. 2018. "Analysis to Input Current Zero Crossing Distortion of Bridgeless Rectifier Operating under Different Power Factors." Energies 11, no. 9: 2447.

Journal article
Published: 27 April 2018 in Energies
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A novel rectifier based on a triple line-voltage cascaded VIENNA converter (LVC-VC) was proposed. Compared to the conventional cascaded H-bridge converters, the switch voltage stress is lower, and the numbers of switches and dc capacitors are fewer under similar operating conditions in the proposed new multilevel converter. The modeling and control for the LVC-VC ware presented. Based on the analysis of the operation principle of the new converter, the power factor correction of the proposed converter was realized by employing a traditional one-cycle control strategy. The minimum average value and maximum harmonic components of the dc-link voltages of the three VIENNA rectifier modules ware calculated. Three VIENNA dc-link voltages were unbalanced under the unbalanced load conditions, so the zero sequence current was injected to the three inner currents for balancing three VIENNA dc-link voltages. Simulation and the results of the experiment verified the availability of the new proposed multilevel converter and the effectiveness of the corresponding control strategy applied.

ACS Style

Jia Zou; Cong Wang; Hong Cheng; Jinqi Liu. Triple Line-Voltage Cascaded VIENNA Converter Applied as the Medium-Voltage AC Drive. Energies 2018, 11, 1079 .

AMA Style

Jia Zou, Cong Wang, Hong Cheng, Jinqi Liu. Triple Line-Voltage Cascaded VIENNA Converter Applied as the Medium-Voltage AC Drive. Energies. 2018; 11 (5):1079.

Chicago/Turabian Style

Jia Zou; Cong Wang; Hong Cheng; Jinqi Liu. 2018. "Triple Line-Voltage Cascaded VIENNA Converter Applied as the Medium-Voltage AC Drive." Energies 11, no. 5: 1079.