TY - GEN
T1 - Delay Analysis and Compensation for Digital MSOGI-QSG Implementation in Back-To-Back Interfacing Converter between Microgrid and Utility Grid for Harmonic Extraction
AU - Deng, Yai Pioth Yai
AU - Liu, Jinjun
AU - Faruque, Md Omar
AU - Pamidi, Sastry
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - Due to its ability to detect different harmonic components in highly polluted grid conditions and harmonics induced into the microgrid point of common coupling (PCC) bus by nonlinear loads, the multiple second-order generalized integrator-quadrature signal generator (MSOGI-QSG) is widely used in domains like grid synchronization and signal extraction. However, it typically suffers from an ac discretization error problem in digital implementation. The impact of unit delay in cross feedback to break algebraic loops in digital implementation is investigated in this paper, and it is discovered that uncompensated delay causes steady-state errors even if individual second-order generalized integrator-quadrature signal generator (SOGI-QSG) discretization is accurate. Based on the findings, a simple and effective rotational transformation-based compensation method is proposed, which considerably enhances the accuracy of signal extraction and frequency estimation when used in conjunction with a frequency-locked loop (FLL). The proposed method is validated through experimental results.
AB - Due to its ability to detect different harmonic components in highly polluted grid conditions and harmonics induced into the microgrid point of common coupling (PCC) bus by nonlinear loads, the multiple second-order generalized integrator-quadrature signal generator (MSOGI-QSG) is widely used in domains like grid synchronization and signal extraction. However, it typically suffers from an ac discretization error problem in digital implementation. The impact of unit delay in cross feedback to break algebraic loops in digital implementation is investigated in this paper, and it is discovered that uncompensated delay causes steady-state errors even if individual second-order generalized integrator-quadrature signal generator (SOGI-QSG) discretization is accurate. Based on the findings, a simple and effective rotational transformation-based compensation method is proposed, which considerably enhances the accuracy of signal extraction and frequency estimation when used in conjunction with a frequency-locked loop (FLL). The proposed method is validated through experimental results.
KW - Multiple second-order generalized integrator-quadrature signal generator
KW - back-To-back interfacing converter.
KW - digital implementation
KW - frequency-locked loop
KW - harmonics signal extraction
UR - https://www.scopus.com/pages/publications/85143437703
U2 - 10.1109/IEACon55029.2022.9951726
DO - 10.1109/IEACon55029.2022.9951726
M3 - 会议稿件
AN - SCOPUS:85143437703
T3 - 2022 IEEE Industrial Electronics and Applications Conference, IEACon 2022
SP - 163
EP - 168
BT - 2022 IEEE Industrial Electronics and Applications Conference, IEACon 2022
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 3rd IEEE Industrial Electronics and Applications Conference, IEACon 2022
Y2 - 3 October 2022 through 4 October 2022
ER -