TY - JOUR
T1 - Uncertainty and disturbance estimator with improved steady-state performance for grid-connected power converters
AU - Vule, Yan
AU - Elkayam, Moria
AU - Kuperman, Alon
N1 - Publisher Copyright: © 2020 Institution of Engineering and Technology. All rights reserved.
PY - 2020/9/7
Y1 - 2020/9/7
N2 - The study suggests a method aimed to improve the performance of practical grid-connected converters connected to distorted mains, utilising total uncertainty and disturbance estimator (TUDE) based control structures with time-delay filter. Such a TUDE filter enhances disturbance rejection performance by possessing near-unity magnitude and near-zero phase at integer multiples of the base frequency, imposing repetitive-control-alike behaviour. However, it is well-known that in repetitive control, disturbance rejection at mid-frequencies, were non-periodic disturbances and noise may exist, is deteriorated. This study presents an enhancement, allowing to retain good disturbance rejection at mid-frequencies within the low-frequency portion of control bandwidth (relevant in practical systems) while trading-off the performance in the high-frequency control bandwidth part. The proposed methodology is verified by application to output current control of LCL-filter based inverter feeding distorted AC mains. The validity and performance of the proposed methodology are well-supported by simulations and experiments.
AB - The study suggests a method aimed to improve the performance of practical grid-connected converters connected to distorted mains, utilising total uncertainty and disturbance estimator (TUDE) based control structures with time-delay filter. Such a TUDE filter enhances disturbance rejection performance by possessing near-unity magnitude and near-zero phase at integer multiples of the base frequency, imposing repetitive-control-alike behaviour. However, it is well-known that in repetitive control, disturbance rejection at mid-frequencies, were non-periodic disturbances and noise may exist, is deteriorated. This study presents an enhancement, allowing to retain good disturbance rejection at mid-frequencies within the low-frequency portion of control bandwidth (relevant in practical systems) while trading-off the performance in the high-frequency control bandwidth part. The proposed methodology is verified by application to output current control of LCL-filter based inverter feeding distorted AC mains. The validity and performance of the proposed methodology are well-supported by simulations and experiments.
UR - http://www.scopus.com/inward/record.url?scp=85092110884&partnerID=8YFLogxK
U2 - https://doi.org/10.1049/iet-rpg.2019.1024
DO - https://doi.org/10.1049/iet-rpg.2019.1024
M3 - Article
SN - 1752-1416
VL - 14
SP - 2183
EP - 2191
JO - IET Renewable Power Generation
JF - IET Renewable Power Generation
IS - 12
ER -