Power Conversion and Operation Principle Characterization of T-Type Transformerless Modular Multilevel DC-DC Converters for HVDC Grids
Modular multilevel DC-DC converters (MMDCs) have gained considerable interest due to the increasingly widespread expectations of HVDC grids. Among various topologies, T-type transformerless MMDCs with a wide operation range and fault-blocking capability are a good choice for interconnecting the HVDC links with different voltage levels. This paper provides a comprehensive analysis of this topology, where a simplified equivalent circuit is developed to derive the power flow and balance conditions of T-type transformerless MMDCs. Thereafter, the power conversion and operation principle are characterized in detail. Finally, 320kV/100kV@lGW simulations are conducted to confirm the theoretical expectations.
Authors
- Xin Xiang (ORCID: https://orcid.org/0000-0002-7032-6271)
- Xiangning He (ORCID: https://orcid.org/0000-0002-0953-0097)
- Heya Yang (ORCID: https://orcid.org/0000-0002-5002-3804)
- Haijun Zhang (ORCID: https://orcid.org/0000-0002-9958-1102)
- Wuhua Li (ORCID: https://orcid.org/0000-0002-0345-5815)
- Yipeng Su
Institutions
- Zhejiang University (CN)
Publication Details
- Published
- 2024-11-08
- DOI
- https://doi.org/10.1109/isesc63657.2024.10785441
- Citations
- 5
- Primary Topic
- HVDC Systems and Fault Protection
- Type
- article
- Field-Weighted Citation Impact
- 1.04