| Abstract: |
| With the development of power electronics technology, the flexible DC grid will play a significant role in
promoting the transformation and reformation of the power grid. It is immune to commutation failure and has
high flexibility in power control and renewable energy grid integration. However, the protection and fault handling
technology for a flexible DC grid is a big challenge because of the limited overcurrent capability of the converters.
This paper summarizes the development of the flexible DC grid, and analyzes the fault characteristics in detail. Next,
the applicability, advantages and disadvantages of the existing protection principle, fault isolation and recovery
schemes are reviewed. Finally, the key problems and development trend of the future flexible DC grid are pointed
out and forecasted respectively. |
| Key words: Flexible DC power grid, Fault analysis, Protection, Fault isolation, Reclose |
| DOI：10.1186/s41601-020-00157-9 |
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| Fund: |
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