Abstract
Cascaded power electronic transformer (PET) for hybrid AC/DC distribution networks can realize multiple functions such as flexible interconnection, voltage conversion, electrical isolation and power control. Due to the high degree of electrical coupling between the cascaded H-bridge and the dual active bridge stage in the cascaded PET with different control objectives, a hierarchical decoupling control scheme is proposed to simplify the control architecture and achieve independent flexible control at all levels. Since the topology of cascaded PET adopts input-series output-parallel (ISOP) of multiple power units, a control strategy of series voltage equalization and parallel current equalization based on hierarchical decoupling control is proposed to reduce the influence of parameter differences. A cascaded PET with rated AC voltage of 10 kV, rated DC voltage of 750 V and rated capacity of 500 kVA is developed, and the experimental results verify the feasibility and effectiveness of the engineering application of the control scheme.
| Translated title of the contribution | Hierarchical Decoupling Control of Cascaded Power Electronic Transformer |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 194-199 |
| Number of pages | 6 |
| Journal | Dianli Xitong Zidonghua/Automation of Electric Power Systems |
| Volume | 45 |
| Issue number | 8 |
| DOIs | |
| State | Published - 25 Apr 2021 |
| Externally published | Yes |
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