Lai, Jinmu, Wang, Fei, Liang, Jun  ORCID: https://orcid.org/0000-0001-7511-449X, Xiao, Fan, Wang, Sheng and Yin, Xin
2026.
A novel hybrid capacity regulating transformer and its dual-mode flexible switching strategy.
IEEE Transactions on Industrial Electronics
73
(8)
, pp. 11711-11723.
10.1109/tie.2026.3672864
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Abstract
Distribution systems with high penetration of distributed renewable energy sources (DRES) encounter challenges such as inefficient operation under light-load conditions, and power quality disturbances. To address these issues, this article proposes a novel hybrid capacity regulating transformer (HCRT) integrated with an auxiliary multifunctional converter (MFC) and a dual-mode flexible switching strategy. An equivalent circuit model of the HCRT is developed to derive the arc-free tap-changing mechanism for both large- and small-capacity operations. Optimal energy-saving operating is achieved through coordinated control of the auxiliary MFC. During mode transitions, the auxiliary MFC fully supports the load and decouples tap-changing operations on both windings via solid-state switches, enabling zero-current, arc-free switching and simplifying the on-load tap changers design. A four-stage capacity regulation (FSCR) process is introduced to reduce control complexity. Furthermore, a dual-mode flexible switching strategy is proposed for FSCR, employing a weighting coefficient to coordinate grid-following and grid-forming control, enabling smooth mode transitions without inducing load voltage disturbances. Simulation and experimental results validate the effectiveness and feasibility of the proposed topology and control scheme.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Engineering |
| Additional Information: | RRS policy applied |
| Publisher: | Institute of Electrical and Electronics Engineers |
| ISSN: | 0278-0046 |
| Date of First Compliant Deposit: | 31 March 2026 |
| Date of Acceptance: | 15 February 2026 |
| Last Modified: | 04 Aug 2026 14:45 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/186075 |
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