Improved damping control method for grid-forming converters using LQR and optimally weighted feedback control loops
Ahmed, Mohamed and Alsokhiry, Fahad and Abdel-Khalik, Ayman S. and Ahmed, Khaled H. and Al-Turki, Yusuf (2021) Improved damping control method for grid-forming converters using LQR and optimally weighted feedback control loops. IEEE Access, 9. pp. 87484-87500. ISSN 2169-3536 (https://doi.org/10.1109/ACCESS.2021.3089197)
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Abstract
Power grid pattern is expected to evolve from generator-based power systems towards converter-based systems in the forthcoming decades. Therefore, grid-forming converters will be pertinent to interconnected power grids in pursuance of enhancement their resilience against disturbances. This paper introduces a new efficient damping control method for grid-forming converters that provides a smooth power modulation and an efficient damping response against frequency and voltage deviations. First, an averaged state-space representation for a grid forming application in dq synchronization frame is derived. Based on this model, a new hybrid damping controller, including the concept of state feedback control and PI control, is proposed to address the main issues in existing controllers. The state feedback controller is optimally designed using a linear-quadratic regulator (LQR) approach to optimize the system performance. Moreover, the PI controller is optimally designed using the pattern search algorithm. The proposed damping control method integrates optimally between the control loops through a mapping matrix to rapidly synchronize with the grid and efficiently damp the oscillations. Simulations are carried out to prove the proposed method robustness. Finally, a comparative study using controller hardware-in-the-loop (CHiL) is employed against conventional system to validate the proposed damping method.
ORCID iDs
Ahmed, Mohamed ORCID: https://orcid.org/0000-0002-8569-4763, Alsokhiry, Fahad ORCID: https://orcid.org/0000-0001-9426-4514, Abdel-Khalik, Ayman S., Ahmed, Khaled H. and Al-Turki, Yusuf;-
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Item type: Article ID code: 76803 Dates: DateEvent24 June 2021Published6 June 2021AcceptedSubjects: Technology > Electrical engineering. Electronics Nuclear engineering Department: Faculty of Engineering > Electronic and Electrical Engineering
University of Strathclyde > University of StrathclydeDepositing user: Pure Administrator Date deposited: 16 Jun 2021 11:38 Last modified: 20 Nov 2024 01:21 URI: https://strathprints.strath.ac.uk/id/eprint/76803