TY - JOUR
T1 - Advanced type-1c FLL for enhancing converters synchronization during frequency drift
AU - Al Beshr, H.
AU - El Moursi, Mohamed Shawky
AU - Hamed, Hany A.
AU - Al-Sumaiti, Ameena
N1 - Funding Information:
Manuscript received February 14, 2020; revised April 24, 2020, June 1, 2020, and June 5, 2020; accepted June 6, 2020. Date of publication June 9, 2020; date of current version March 24, 2021. This work was supported by the Khalifa University of Science and Technology under Award [CIRA-2018-37]. Paper no. TPWRD-00243-2020. (Corresponding author: Mohamed Shawky El Moursi.) Hamad Al Beshr, M. S. El Moursi, and A. S. Al-Sumaiti are with the Advanced Power and Energy Center (APEC), EECS Department, Khalifa University, Abu Dhabi 127788, UAE. M. S. El Moursi is currently on leave from the Faculty of Engineering, Mansoura University, Mansoura 35516, Egypt (e-mail: [email protected]).
Publisher Copyright:
© 1986-2012 IEEE.
PY - 2021/4
Y1 - 2021/4
N2 - This paper introduces a novel out-loop compensation scheme with a selective filtering stage for Type-1 Frequency Locked Loop (FLL) to obtain the same features of Type-2 FLL in response to frequency drift. The proposed scheme can eliminate the phase angle error during frequency drift without compromising its benefits of the low order control system. The performance of the proposed Type1-c FLL is evaluated with alternatively employed Delayed Signal Cancellation (DSC), Low Pass Filter (LPF) with selective harmonics filtering and multiple second-order generalized integrator (MSOGI) as a pre-filtering stage under the various grid disturbances. The effects of each filtering scheme on the dynamic response and harmonics mitigation are identified. As each filter has a distinct advantage in response to each grid disturbance, a selective control approach is used to insert the most suitable filter based on the severity of the grid disturbance to achieve the best performance. A comprehensive study is conducted to demonstrate the superior performance of the proposed schemes with both simulation and experimental validation. In addition, the potential application of the proposed Type-1c FLL for enhancing the islanded microgrid operation has been presented and verified.
AB - This paper introduces a novel out-loop compensation scheme with a selective filtering stage for Type-1 Frequency Locked Loop (FLL) to obtain the same features of Type-2 FLL in response to frequency drift. The proposed scheme can eliminate the phase angle error during frequency drift without compromising its benefits of the low order control system. The performance of the proposed Type1-c FLL is evaluated with alternatively employed Delayed Signal Cancellation (DSC), Low Pass Filter (LPF) with selective harmonics filtering and multiple second-order generalized integrator (MSOGI) as a pre-filtering stage under the various grid disturbances. The effects of each filtering scheme on the dynamic response and harmonics mitigation are identified. As each filter has a distinct advantage in response to each grid disturbance, a selective control approach is used to insert the most suitable filter based on the severity of the grid disturbance to achieve the best performance. A comprehensive study is conducted to demonstrate the superior performance of the proposed schemes with both simulation and experimental validation. In addition, the potential application of the proposed Type-1c FLL for enhancing the islanded microgrid operation has been presented and verified.
KW - Distortion elimination
KW - Frequency esti-mation and phase estimation
KW - Frequency-locked loop (FLL)
UR - http://www.scopus.com/inward/record.url?scp=85103400363&partnerID=8YFLogxK
U2 - 10.1109/TPWRD.2020.3001217
DO - 10.1109/TPWRD.2020.3001217
M3 - Article
AN - SCOPUS:85103400363
SN - 0885-8977
VL - 36
SP - 1063
EP - 1078
JO - IEEE Transactions on Power Delivery
JF - IEEE Transactions on Power Delivery
IS - 2
M1 - 9112699
ER -