A Novel Modular Multilevel Converter Based Power Electronic Transformer With Integrated Switching Pairs

This paper proposes a novel topology in the family of modular multilevel converter based power electronic transformers (MMC-PETs). Different from the existing MMC-PE Ts, an integrated switching pairs (ISP) is used as the new submodule of MMC, which is responsible for both the input and intermediate stages of PET. In other words, both two power conversion stages share a pair of switches. Therefore, compared with the traditional MMC-PET, two IGBTs and two diodes can be saved. Furthermore, a hybrid frequency modulation strategy is proposed for this new ISP-MMC-PET topology, which is able to achieve separation of high and low frequency modulation signals without using frequency selection networks. Simulation results in Matlab/Simulink validate the correctness and effectiveness of the proposed ISP-MMC-PET and the corresponding hybrid frequency modulation strategy.

[1]  Xiaofeng Sun,et al.  An Inductive-Filtering Strategy of Submodule Ripple-Power in Triple-Port MMC-Based SST Applied to Hybrid Medium and Low Voltage AC/DC Interface , 2022, IEEE Transactions on Power Electronics.

[2]  Xu Cai,et al.  Design and Control of Power Fluctuation Delivery for Cell Capacitance Optimization in Multiport Modular Solid-State Transformers , 2021, IEEE Transactions on Power Electronics.

[3]  Xiaohui Qu,et al.  A MMC-Based Multiport Power Electronic Transformer With Shared Medium-Frequency Transformer , 2021, IEEE Transactions on Circuits and Systems II: Express Briefs.

[4]  Xiaohui Qu,et al.  A Multiport Power Electronic Transformer Based on Modular Multilevel Converter and Mixed-Frequency Modulation , 2020, IEEE Transactions on Circuits and Systems II: Express Briefs.

[5]  Bian Linlin,et al.  Topology and Control Strategy Improvement of Middle Stage of Power Electronic Transformer Based on Modular Multilevel Converter , 2019, 2019 4th International Conference on Power and Renewable Energy (ICPRE).

[6]  Yang Wang,et al.  A Modified DC Power Electronic Transformer Based on Series Connection of Full-Bridge Converters , 2019, IEEE Transactions on Power Electronics.

[7]  Yonghai Xu,et al.  Hybrid-Frequency Cascaded Full-Bridge Solid-State Transformer , 2019, IEEE Access.

[8]  Johann W. Kolar,et al.  Applicability of Solid-State Transformers in Today’s and Future Distribution Grids , 2019, IEEE Transactions on Smart Grid.

[9]  Zhang Jianwen,et al.  Family of Modular Multilevel Converter (MMC) Based Solid State Transformer (SST) Topologies for Hybrid AC/DC Distribution Grid Applications , 2018, 2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC).

[10]  Johann W. Kolar,et al.  Solid-State Transformers: On the Origins and Evolution of Key Concepts , 2016, IEEE Industrial Electronics Magazine.

[11]  Ping Wang,et al.  A three-phase 10 kVAC-750 VDC power electronic transformer for smart distribution grid , 2013, 2013 15th European Conference on Power Electronics and Applications (EPE).

[12]  Hao Yuan,et al.  Research on voltage and power balance control for cascaded modular solid-state transformer , 2011, IEEE Transactions on Power Electronics.

[13]  Dianguo Xu,et al.  Analysis of the Phase-Shifted Carrier Modulation for Modular Multilevel Converters , 2015, IEEE Transactions on Power Electronics.