Abstract
In this article, a medium-voltage nonisolated dc-dc converter with dc fault-blocking capability is proposed. The converter is designed to connect two high-voltage dc networks with varying voltage levels. The proposed converter is composed of a string of cascaded modules and two sets of series-connected switches. The cascaded modules have all the merits of modular design, and the series-connected switches avoid dynamic balancing issues due to the zero-voltage switching feature. The single-string structure of the proposed converter helps reduce the number of switches, power losses, and volume. The power efficiency of the converter is evaluated to be as high as 99.3%. The feasibility of the proposed converter is verified via 32-kV 22.5-MW simulations and 240-V 1.45-kW experiments.
| Original language | English |
|---|---|
| Pages (from-to) | 8033-8044 |
| Number of pages | 12 |
| Journal | IEEE Transactions on Power Electronics |
| Volume | 37 |
| Issue number | 7 |
| DOIs | |
| State | Published - 1 Jul 2022 |
Keywords
- DC-DC converter
- dc fault-blocking capability
- dc network connection
- zero-voltage switching