ZHENG Z, JING K F.Study on triangular modular multilevel DC/DC converter[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(1):133-141.

doi:10.16186/j.cnki.1673-9787.2021070018

Received:2021/07/05

Revised:2021/10/11

Published:2023/01/25

Study on triangular modular multilevel DC/DC converter

ZHENG Zheng, JING Kaifeng

School of Electrical Engineering and Automation，Henan Polytechnic University，Jiaozuo 454000，Henan，China

Abstract:DC/DC converter，an interface converter of double bus in DC microgrid，is taken as an important role in energy conversion.In view of the shortcomings of traditional DC/DC converters such as high stress and low gain，it is not suitable for medium and high power applications.Low device stress and high voltage gain of modular multilevel DC/DC converters is realized through module series and parallel connections，it is suitable for medium and high power applications.The triangular modular multilevel DC/DC converter was taken as the research object to analyze the circuit topology and working principle in this paper.The equality of voltage and current sharing was realized in all modules of the circuit，and the circuit power was equally distributed to each module.For the coupling relationship of variables in the circuit，the decoupling control strategy was researched and designed.For the characteristics of large voltage ripple under the non-interleaved modulation mode，the interleaved modulation method between different stages was proposed.In the proposed method，good dynamic and static performance was realized，the output voltage ripple was effectively reduced.Finally，a simulation model was built through MATLAB/Simulink，the feasibility and effectiveness of the decoupling control strategy and modulation was verified through the simulation，the dynamic characteristics of the circuit and the output DC power quality was improved.

Key words:DC microgrid;modular multilevel;DC/DC converter;interleaved conduction

 三角形模块化多电平DC_DC变换器研究_郑征.pdf