TY - GEN
T1 - Lyapunov Function-Based Control Strategy for Single Phase GFI System Using LLCL Filter With Faster Dynamics
AU - Prakash, Surya
AU - Al Zaabi, Omar
AU - Kumar Behera, Ranjan
AU - Al Jaafari, Khaled
AU - Al Hosani, Khalifa
AU - Muduli, Utkal Ranjan
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023
Y1 - 2023
N2 - Integrating an LLCL filter within a grid-following inverter (GFI) system poses resonance challenges that can lead to system instability, similar to the classic LCL filter. In a single-phase GFI system employing an LLCL filter, Lyapunov function-based current (LFBC) control is commonly used to address these issues. While LFBC control ensures global stability, it fails to eliminate grid current oscillation, which remains a significant concern. To overcome this challenge, a modified LFBC controller is proposed in this paper, which guarantees global stability and substantially reduces grid current oscillation. The proposed technique incorporates the PR controller to generate inverter current references. The use of the PR controller, combined with the modified LFBC controller, ensures accurate and robust generation of inverter current references, leading to improved system performance and enhanced stability. Additionally, the modified LFBC controller resolves the limitations of the conventional LFBC control method and significantly improves the stability and quality of the grid current. The effectiveness of the proposed technique is compared with the traditional LFBC control method. The results demonstrate that the proposed LFBC controller successfully mitigates grid current oscillation while maintaining global stability. The GFI system shows a fast dynamic response and effectively injects sinusoidal grid current by utilizing the proposed controller, thereby improving the system's performance.
AB - Integrating an LLCL filter within a grid-following inverter (GFI) system poses resonance challenges that can lead to system instability, similar to the classic LCL filter. In a single-phase GFI system employing an LLCL filter, Lyapunov function-based current (LFBC) control is commonly used to address these issues. While LFBC control ensures global stability, it fails to eliminate grid current oscillation, which remains a significant concern. To overcome this challenge, a modified LFBC controller is proposed in this paper, which guarantees global stability and substantially reduces grid current oscillation. The proposed technique incorporates the PR controller to generate inverter current references. The use of the PR controller, combined with the modified LFBC controller, ensures accurate and robust generation of inverter current references, leading to improved system performance and enhanced stability. Additionally, the modified LFBC controller resolves the limitations of the conventional LFBC control method and significantly improves the stability and quality of the grid current. The effectiveness of the proposed technique is compared with the traditional LFBC control method. The results demonstrate that the proposed LFBC controller successfully mitigates grid current oscillation while maintaining global stability. The GFI system shows a fast dynamic response and effectively injects sinusoidal grid current by utilizing the proposed controller, thereby improving the system's performance.
KW - Grid-following inverter
KW - LCL-filter
KW - LLCL-filter
KW - Lyapunov function
UR - http://www.scopus.com/inward/record.url?scp=85182933671&partnerID=8YFLogxK
U2 - 10.1109/ECCE53617.2023.10362016
DO - 10.1109/ECCE53617.2023.10362016
M3 - Conference contribution
AN - SCOPUS:85182933671
T3 - 2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023
SP - 1075
EP - 1080
BT - 2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023
Y2 - 29 October 2023 through 2 November 2023
ER -