Summary
The replacement of traditional fossil fuels with new energy sources is a prevailing trend in global energy development. As the demand for electricity continues to rise worldwide, new energy generation is increasingly deployed in large-scale and clustered forms. Developing DC grid technologies—based on DC collection and DC transmission—is essential for supporting the large-scale delivery of renewable energy. As one of the core devices in DC grids, highvoltage and high-capacity DC transformers play a crucial role in DC voltage conversion and
Read more Read lessDC power flow control.
For GW-level renewable energy collection and transmission applications, this paper proposes a high step-up ratio DC transformer based on a face-to-face structure composed of a 7-level current-source converter (CSC) and an MMC. A 7-level two-degree-of-freedom fundamentalfrequency modulation method is further proposed, in which an arm conduction angle is introduced on top of the fundamental multi-level modulation, ensuring flexible and efficient
CSC operation. The output current and power expressions of the 7-level CSC are then derived, based on which the overall control scheme of the DC transformer is designed. Simulation results demonstrate that the proposed topology is an effective and feasible solution for achieving GW-level power transfer and a 10-fold voltage step-up.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | B4_11595_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | China, People's Republic of |
| Study committees | |
| File size | 1 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
WEI Chenyang - China Electric Power Research Institute; GAO Chong - China Electric Power Research Institute; LIN Zhiguang - China Electric Power Research Institute; CHEN Kailong - China Electric Power Research Institute
Keywords
