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Wu Chen - One of the best experts on this subject based on the ideXlab platform.

  • zero voltage switching pwm hybrid full bridge three Level Converter
    IEEE Transactions on Power Electronics, 2005
    Co-Authors: Xinbo Ruan, Zhiying Chen, Wu Chen
    Abstract:

    This paper proposes a zero-voltage-switching (ZVS) pulse-width modulation (PWM) hybrid full-bridge three-Level Converter, which has a three-Level leg and a two-Level leg. The switches of the three-Level leg sustain only the half of the input voltage, and they can realize ZVS in a wide load range. The switches of the two-Level leg sustain the input voltage, and they can realize ZVS with the use of the resonant inductance. The secondary rectified voltage is a three-Level waveform having lower high-frequency content compared with that of the traditional full-bridge Converters, which can reduce the output filter, and as a result, the dynamic response of the Converter is improved. The voltage stress of the rectifier diode is reduced also. The input current of the Converter has quite little ripple, so the input filter can also be significantly reduced. The operation principle of the proposed Converter is analyzed and verified by the experimental results.

Xinbo Ruan - One of the best experts on this subject based on the ideXlab platform.

  • zero voltage switching pwm hybrid full bridge three Level Converter
    IEEE Transactions on Power Electronics, 2005
    Co-Authors: Xinbo Ruan, Zhiying Chen, Wu Chen
    Abstract:

    This paper proposes a zero-voltage-switching (ZVS) pulse-width modulation (PWM) hybrid full-bridge three-Level Converter, which has a three-Level leg and a two-Level leg. The switches of the three-Level leg sustain only the half of the input voltage, and they can realize ZVS in a wide load range. The switches of the two-Level leg sustain the input voltage, and they can realize ZVS with the use of the resonant inductance. The secondary rectified voltage is a three-Level waveform having lower high-frequency content compared with that of the traditional full-bridge Converters, which can reduce the output filter, and as a result, the dynamic response of the Converter is improved. The voltage stress of the rectifier diode is reduced also. The input current of the Converter has quite little ripple, so the input filter can also be significantly reduced. The operation principle of the proposed Converter is analyzed and verified by the experimental results.

  • Zero-voltage and zero-current-switching PWM hybrid full-bridge three-Level Converter
    2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289), 2002
    Co-Authors: Xinbo Ruan
    Abstract:

    This paper proposes a zero-voltage and zero-current-switching PWM hybrid full-bridge three-Level Converter (ZVZCS PWM H-FB TL Converter), which has a three Level (TL) leg and a two-Level leg. The voltage stress of the switches of the TL leg is half of the input voltage, and the switches can realize ZVS, so the MOSFET can be adopted. The voltage stress of the switches of the two-Level leg is the input voltage, and the switches can realize ZCS, so IGBT can be adopted. The secondary rectified voltage is a TL waveform having lower high-frequency content compared with that of the traditional FB Converters, which leads to the reduction of the output filter inductance. The input current of the Converter has quite low ripple, the input filter can also be significantly reduced. The operation principle of the proposed Converter is analyzed and verified by the experimental results. Several ZVZCS PWM H-FB TL Converters are also proposed in this paper.

Caisheng Wang - One of the best experts on this subject based on the ideXlab platform.

  • Dual T-Type Four-Level Converter
    IEEE Transactions on Power Electronics, 2020
    Co-Authors: Jianfei Chen, Caisheng Wang
    Abstract:

    This letter proposes a three-phase dual T-type four-Level Converter topology that consists of two T-type networks per phase leg. The proposed Converter has only six power switches per phase leg without any clamping diodes or flying capacitors. Besides, it is a flexible topology as there are several bidirectional switch alternatives that can be used for the proposed Converter. As for the common severe voltage imbalance issue of the proposed topology and other four-Level Converters with three series-connected capacitors, the voltage imbalance mechanism is first revealed, and then a variable-carrier based voltage-balance control method is proposed. It aims at controlling the middle capacitor voltage at 1/3 of the full dc-link voltage and the upper and lower capacitor voltages are automatically balanced. Experimental results have been carried out to verify the proposed topology and the proposed variable-carrier based voltage-balance control method.

Peter Steimer - One of the best experts on this subject based on the ideXlab platform.

  • operation and control of a hybrid seven Level Converter
    IEEE Transactions on Power Electronics, 2012
    Co-Authors: Maryam Saeedifard, P Barbosa, Peter Steimer
    Abstract:

    This paper introduces a novel hybrid seven-Level Converter that is based on the upgrade of the five-Level active neutral-point-clamped Converter concept and is suitable for high-power applications. The paper provides a comprehensive analysis for the operation of the Converter. Based on the analysis, a space vector modulation (SVM)-based switching strategy that takes advantage of redundant switching vectors of the SVM strategy to counteract the voltage drift phenomenon of the proposed Converter is proposed. The limit to the range of operation of the seven-Level Converter based on the proposed SVM strategy is also presented. It is shown that the ability to stabilize the dc-link capacitor voltages and the per-phase flying capacitors is a function of the Converter operating indices, i.e., the load power factor and modulation index. The salient feature of the proposed SVM-based control strategy is that it enables proper operation of the Converter with no requirements for additional controls or auxiliary power circuitry, within the specified range of operation. Performance of a Converter under various operating conditions, based on the proposed SVM strategy, in the MATLAB/Simulink environment, is evaluated and experimentally demonstrated.

  • direct modular multi Level Converter for gearless low speed drives
    European Conference on Power Electronics and Applications, 2011
    Co-Authors: Arthur Korn, Manfred Winkelnkemper, Peter Steimer, J W Kolar
    Abstract:

    The suitability of the direct modular multi-Level Converter for high power, low speed, gear- and transformerless drives is investigated. Control methods which optimize the capacitor voltage ripple are presented, analyzed and verified in simulation.

Xie D - One of the best experts on this subject based on the ideXlab platform.

  • Photovoltaic Storage System Based on the Buck Three-Level Converter
    IEEE Transactions on Power Electronics, 2015
    Co-Authors: Xie D
    Abstract:

    It proposes a kind of photovoltaic storage system based on Buck three-Level Converter and the maximum power point tracking(MPPT) control strategy.It also analysises the working principle of Buck three-Level Converter,builts the mathematical model and analysises the small signal model,proves the feasibility of the control strategy.To ensure the balance between two divider capacitor voltage,it discusses the divider capacitor voltage balancing problem,designs the control loop and experimental verification.