Transient Stability Enhancement of DC-DC Boost Converters Feeding Constant Power Loads in DC Microgrid Applications via Composite Nonlinear Control Techniques

Subarto Kumar Ghosh; Tushar Kanti Roy; Zubaer Alam; Sajeeb Saha; Ahmad Alzahrani

doi:10.1109/ACCESS.2023.3291772

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Transient Stability Enhancement of DC-DC Boost Converters Feeding Constant Power Loads in DC Microgrid Applications via Composite Nonlinear Control Techniques

Journal article

Peer reviewed

Transient Stability Enhancement of DC-DC Boost Converters Feeding Constant Power Loads in DC Microgrid Applications via Composite Nonlinear Control Techniques

Subarto Kumar Ghosh, Tushar Kanti Roy, Zubaer Alam, Sajeeb Saha and Ahmad Alzahrani

IEEE Access, Vol.11, pp.69951-69964

2023

DOI: https://doi.org/10.1109/ACCESS.2023.3291772

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Abstract

Control Lyapunov function

composite nonlinear controller

constance power load

external disturbances

negative incremental resistance

nonlinear dynamical model

In this paper, a composite nonlinear controller is developed for stabilizing a constant power load (CPL) feeding DC-DC boost converter (DBC) for DC microgrid applications. If the boost converter is not properly controlled, the negative incremental impedance (NII) of CPLs can cause DC-bus voltage instability. As the original model is not adequate for designing the proposed controller, the nonlinear dynamical model of the DBC is transformed into Brunovsky’s canonical forms. Large load and input voltage changes hinder the controller’s performance. Therefore, the dynamical model has been updated to include constrained external uncertainty. Then, the proposed hybrid controller, which is a combination of the nonlinear backstepping controller and the sliding mode controller, is designed. The sliding mode controller has a double-integral-based sliding surface and a fast power-based reaching law to improve hybrid controller performance. The global stability of the proposed system is analyzed using the control Lyapunov function theory. Lastly, simulation studies in MATLAB/Simulink and experiments on an in-house hardware platform show that the proposed composite controller works well even when there are big changes.

Details

Title: Transient Stability Enhancement of DC-DC Boost Converters Feeding Constant Power Loads in DC Microgrid Applications via Composite Nonlinear Control Techniques
Authors: Subarto Kumar Ghosh (Author) - University of Rajshahi
Tushar Kanti Roy (Author) - University of Rajshahi
Zubaer Alam (Author) - Rajshahi University of Engineering and Technology
Sajeeb Saha (Author) - University of the Sunshine Coast, Queensland, School of Science, Technology and Engineering
Ahmad Alzahrani (Author) - Najran University
Publication details: IEEE Access, Vol.11, pp.69951-69964
Publisher: Institute of Electrical and Electronics Engineers
DOI: 10.1109/ACCESS.2023.3291772
ISSN: 2169-3536
Organisation Unit: School of Science, Technology and Engineering
Language: English
Record Identifier: 99738097102621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Computer Science, Information Systems; Engineering, Electrical & Electronic; Telecommunications

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