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首页> 外文期刊>Power Electronics, IET >Soft-switching and sensorless voltage balancing modulation for unidirectional modular multilevel DC–DC converter
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Soft-switching and sensorless voltage balancing modulation for unidirectional modular multilevel DC–DC converter

机译：单向模块化多级DC-DC转换器的软开关和无传感器电压平衡调制

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摘要

DC–DC converters are important in medium-voltage direct current (MVDC) distribution networks. For the scenarios where energy flows unidirectionally from MVDC distribution networks to low-voltage direct current (LVDC) loads, the DC–DC converter, which composes of a modular multilevel converter (MMC) on the MVDC side, an uncontrolled rectifier on the LVDC side and a high-frequency transformer as the AC link, is the most cost-efficient candidate. In this study, a new modulation method with quasi-triangular AC-link current is presented to realise zero-voltage turning-on for all switches on the MVDC side, as well as zero-current-switching for the uncontrolled rectifier on the LVDC side. Besides, by adding simple and low-cost voltage-balancing D-L auxiliary circuits between adjacent submodules (SMs), all SM capacitor voltages can be well balanced without voltage sensors. The validity and effectiveness of the proposed method are verified by the simulation and experimental results.
机译：DC-DC转换器在中压直流（MVDC）配送网络中很重要。对于从MVDC分配网络单向流向低压直流（LVDC）负载的情况，DC-DC转换器在MVDC侧的模块化多级转换器（MMC）中的能量流动，可以在LVDC侧的不受控制的整流器上进行单向流动。和一个高频变压器作为交流链路，是最具成本效益的候选人。在本研究中，提出了一种新的调制方法，用于实现MVDC侧的所有开关的零电压开启，以及LVDC侧的不受控制整流器的零电流切换。此外，通过在相邻子模块（SMS）之间添加简单且低成本的电压平衡D-L辅助电路，所有SM电容电压都可以在没有电压传感器的情况下平衡。通过模拟和实验结果验证了所提出的方法的有效性和有效性。

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  • 来源
    《Power Electronics, IET》 |2020年第15期|3445-3455|共11页
  • 作者

    Gengzhe Zheng; Yu Chen; Ziduo Chen; Yong Kang;

  • 作者单位

    State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) School of Electrical and Electronic Engineering (SEEE) Huazhong University of Science and Technology (HUST) Wuhan People's Republic of China;

    State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) School of Electrical and Electronic Engineering (SEEE) Huazhong University of Science and Technology (HUST) Wuhan People's Republic of China;

    State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) School of Electrical and Electronic Engineering (SEEE) Huazhong University of Science and Technology (HUST) Wuhan People's Republic of China;

    State Key Laboratory of Advanced Electromagnetic Engineering and Technology (AEET) School of Electrical and Electronic Engineering (SEEE) Huazhong University of Science and Technology (HUST) Wuhan People's Republic of China;

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  • 正文语种 eng
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  • 关键词

    high-frequency transformers; rectifiers; voltage control; switching convertors; zero voltage switching; DC-DC power convertors; zero current switching; power transformers;

    机译：高频变压器;整流器;电压控制;开关转换器;零电压切换;DC-DC电源转换器;零电流切换;电力变压器;

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