Stability Enhancement for Parallel Grid-Connected Inverters by Improved Notch Filter

As parallel inverters connected to the weak grid, the interactions between the inverters and the grid are the potential threat to the system stability. The traditional grid-side inductance current feedback control method with notch filter can suppress the high-frequency oscillation. However, it will...

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Main Authors: Ling Yang, Yandong Chen, An Luo, Kunshan Huai
Format: Article
Language:English
Published: IEEE 2019-01-01
Series:IEEE Access
Subjects:
Online Access:https://ieeexplore.ieee.org/document/8717633/
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author Ling Yang
Yandong Chen
An Luo
Kunshan Huai
author_facet Ling Yang
Yandong Chen
An Luo
Kunshan Huai
author_sort Ling Yang
collection DOAJ
description As parallel inverters connected to the weak grid, the interactions between the inverters and the grid are the potential threat to the system stability. The traditional grid-side inductance current feedback control method with notch filter can suppress the high-frequency oscillation. However, it will lead to stability reduction and even instability. Therefore, a stability enhancement method by the improved notch filter is proposed for parallel grid-connected inverters. This method can effectively restrain parallel inverters' harmonic current into the grid, and accordingly avoid the high-frequency oscillation of impedance network. Furthermore, it improves the phase margin of the system, and thus ensures the sufficient stability of the system in the weak grid. Considering the notch depth and dynamic performance of improved notch filter, the appropriate control parameters are selected. Finally, experimental results verify the validity of the proposed control method.
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spelling doaj.art-818576474e3f404dbf9852f199fc89732022-12-21T18:13:26ZengIEEEIEEE Access2169-35362019-01-017656676567810.1109/ACCESS.2019.29175338717633Stability Enhancement for Parallel Grid-Connected Inverters by Improved Notch FilterLing Yang0Yandong Chen1https://orcid.org/0000-0001-7604-7516An Luo2Kunshan Huai3College of Electrical and Information Engineering, Hunan University, Changsha, ChinaCollege of Electrical and Information Engineering, Hunan University, Changsha, ChinaCollege of Electrical and Information Engineering, Hunan University, Changsha, ChinaGuangzhou Power Supply Co., Ltd., Guangzhou, ChinaAs parallel inverters connected to the weak grid, the interactions between the inverters and the grid are the potential threat to the system stability. The traditional grid-side inductance current feedback control method with notch filter can suppress the high-frequency oscillation. However, it will lead to stability reduction and even instability. Therefore, a stability enhancement method by the improved notch filter is proposed for parallel grid-connected inverters. This method can effectively restrain parallel inverters' harmonic current into the grid, and accordingly avoid the high-frequency oscillation of impedance network. Furthermore, it improves the phase margin of the system, and thus ensures the sufficient stability of the system in the weak grid. Considering the notch depth and dynamic performance of improved notch filter, the appropriate control parameters are selected. Finally, experimental results verify the validity of the proposed control method.https://ieeexplore.ieee.org/document/8717633/Weak gridparallel invertersimproved notch filterimpedance reshapingstability enhancement
spellingShingle Ling Yang
Yandong Chen
An Luo
Kunshan Huai
Stability Enhancement for Parallel Grid-Connected Inverters by Improved Notch Filter
IEEE Access
Weak grid
parallel inverters
improved notch filter
impedance reshaping
stability enhancement
title Stability Enhancement for Parallel Grid-Connected Inverters by Improved Notch Filter
title_full Stability Enhancement for Parallel Grid-Connected Inverters by Improved Notch Filter
title_fullStr Stability Enhancement for Parallel Grid-Connected Inverters by Improved Notch Filter
title_full_unstemmed Stability Enhancement for Parallel Grid-Connected Inverters by Improved Notch Filter
title_short Stability Enhancement for Parallel Grid-Connected Inverters by Improved Notch Filter
title_sort stability enhancement for parallel grid connected inverters by improved notch filter
topic Weak grid
parallel inverters
improved notch filter
impedance reshaping
stability enhancement
url https://ieeexplore.ieee.org/document/8717633/
work_keys_str_mv AT lingyang stabilityenhancementforparallelgridconnectedinvertersbyimprovednotchfilter
AT yandongchen stabilityenhancementforparallelgridconnectedinvertersbyimprovednotchfilter
AT anluo stabilityenhancementforparallelgridconnectedinvertersbyimprovednotchfilter
AT kunshanhuai stabilityenhancementforparallelgridconnectedinvertersbyimprovednotchfilter