Abstract
Hydrogen energy storage systems (HESS) are increasingly recognised for their role in sustainable energy applications, though their performance depends on efficient power electronic converter (PEC) interfaces. In this paper, a multiport-isolated DC-DC converter, characterised by enhanced power density, reduced component count, and minimal conversion stages, is implemented for HESS applications. However, the high-frequency multiwinding transformer in this converter introduces cross-coupling effects, complicating control and resulting in large power deviations from nominal values due to step changes on other ports, which adversely impact system performance. To address this issue, a novel model reference-based decoupling control technique is proposed to minimise the error between the actual plant output and an ideal decoupling reference model, which represents the cross-coupling term. This model reference-based decoupling control is further extended into a hybrid decoupling control technique by integrating a decoupling matrix, achieving more robust decoupling across a wider operating region. The hybrid decoupling technique mathematically ensures an improved control performance, with the cross-coupling term minimised through a proportional-derivative controller. The proposed hybrid decoupling controller achieves a maximum power deviation of <3 % under various conditions, outperforming the conventional inverse decoupling matrix technique, which typically exhibits higher deviations under similar conditions. The effectiveness of the hybrid decoupling control is validated through simulations and experimental results, demonstrating significant improvements in decoupling performance.
Original language | English |
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Article number | 115175 |
Number of pages | 10 |
Journal | Journal of Energy Storage |
Volume | 109 |
Early online date | 28 Dec 2024 |
DOIs | |
Publication status | E-pub ahead of print - 28 Dec 2024 |
Keywords
- cross-coupling
- DC-DC converter
- decoupling control
- hydrogen storage
- model reference control
- multiport converter
- triple-active bridge converter