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...
Main Authors: | , , , |
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Format: | Article |
Language: | English |
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IEEE
2019-01-01
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Series: | IEEE Access |
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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. |
first_indexed | 2024-12-22T20:37:17Z |
format | Article |
id | doaj.art-818576474e3f404dbf9852f199fc8973 |
institution | Directory Open Access Journal |
issn | 2169-3536 |
language | English |
last_indexed | 2024-12-22T20:37:17Z |
publishDate | 2019-01-01 |
publisher | IEEE |
record_format | Article |
series | IEEE Access |
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 |