Feedforward Control Strategy of a DC-DC Converter for an Off-Grid Hydrogen Production System Based on a Linear Extended State Observer and Super-Twisting Sliding Mode Control

With the large-scale integration of renewable energy into off-grid DC systems, the stability issues caused by their fluctuations have become increasingly prominent. The dual active bridge (DAB) converter, as a DC-DC converter suitable for high power and high voltage level off-grid DC systems, plays...

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Bibliographic Details
Published in:Electronics (Basel) 2024-10, Vol.13 (19), p.3934
Main Authors: Kang, Zhongjian, Li, Longchen, Zhang, Hongyang
Format: Article
Language:English
Subjects:
Alternative energy sources
Analysis
Bridge maintenance
Bridges
Control algorithms
Control methods
Control stability
Control systems
Controllers
Dynamic response
Electric bridges
Electric converters
Electric current converters
Electric power transmission
Electricity distribution
Feedforward control
Hydrogen
Hydrogen production
Linear control
Load
Mathematical models
Nonlinear control
Nonlinear response
Reduced order models
Renewable resources
Sliding mode control
Software
State observers
Systems stability
Transient stability
Twisting
Voltage converters (DC to DC)
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Summary:With the large-scale integration of renewable energy into off-grid DC systems, the stability issues caused by their fluctuations have become increasingly prominent. The dual active bridge (DAB) converter, as a DC-DC converter suitable for high power and high voltage level off-grid DC systems, plays a crucial role in maintaining and regulating grid stability through its control methods. However, the existing control methods for DAB are inadequate: linear control fails to meet dynamic response requirements, while nonlinear control relies on detailed model structures and parameters, making the control design complex and less accurate. To address this issue, this paper proposes a feedforward control strategy for a DC-DC converter in an off-grid hydrogen production system based on a linear extended state observer (LESO) and super-twisting sliding mode control (STSMC). Firstly, a reduced-order simplified model of the DAB was constructed through the structure of DAB. Then, based on the reduced-order simplified model, a feedforward control based on LESO and STSMC was designed, and its stability was analyzed. Finally, a simulation comparison of PI, LESO + terminal sliding mode control (TSMC), and LESO + STSMC control methods was conducted in a DC off-grid hydrogen production system. The results verified the proposed control method’s enhancement of the DAB’s rapid dynamic response capability and the system’s transient stability.
ISSN:2079-9292
2079-9292
DOI:10.3390/electronics13193934