Seamless Transition Control Method of Grid-Connected Inverters Under Unbalanced Voltage Conditions
The transition between Grid-Forming (GFM) and Grid-Following (GFL) modes is critical for adapting to changing power grid conditions. These transitions are essential for protecting grid-connected inverter systems and ensuring reliable power supply. However, abrupt changes during the transition proces...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IEEE
2025-01-01
|
| Series: | IEEE Open Journal of Power Electronics |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/11088226/ |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849395522605940736 |
|---|---|
| author | Hyun J. Kim Ho J. Lee Min S. Kim Eun S. Lee |
| author_facet | Hyun J. Kim Ho J. Lee Min S. Kim Eun S. Lee |
| author_sort | Hyun J. Kim |
| collection | DOAJ |
| description | The transition between Grid-Forming (GFM) and Grid-Following (GFL) modes is critical for adapting to changing power grid conditions. These transitions are essential for protecting grid-connected inverter systems and ensuring reliable power supply. However, abrupt changes during the transition process can disrupt both internal and external control loops, potentially causing voltage and current distortions that jeopardize system stability. This challenge is particularly significant when transitioning between GFL and GFM modes under unbalanced load conditions. To address this, this paper proposes a seamless control strategy that enables dynamic and stable transitions between GFL and GFM modes, even under unbalanced three-phase voltage conditions. The proposed approach is based on three key criteria that ensure stability during transitions across various grid scenarios. Additionally, a simple yet effective method for extracting positive and negative sequence components using digital filters is introduced to facilitate the seamless control implementation. The effectiveness of the control strategy is validated through extensive simulations and experiments using a 300 kVA hardware setup. The results demonstrate successful seamless transitions under unbalanced conditions while maintaining a total harmonic distortion (THD) of less than 3%. This method significantly enhances the stability and reliability of power systems, especially in environments characterized by varying grid strengths. |
| format | Article |
| id | doaj-art-1de4b2ae29d5404baaf272925e77c5d8 |
| institution | Kabale University |
| issn | 2644-1314 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of Power Electronics |
| spelling | doaj-art-1de4b2ae29d5404baaf272925e77c5d82025-08-20T03:39:36ZengIEEEIEEE Open Journal of Power Electronics2644-13142025-01-0161333134610.1109/OJPEL.2025.359164011088226Seamless Transition Control Method of Grid-Connected Inverters Under Unbalanced Voltage ConditionsHyun J. Kim0https://orcid.org/0009-0002-2368-3919Ho J. Lee1https://orcid.org/0009-0000-0895-0500Min S. Kim2https://orcid.org/0000-0002-2928-0005Eun S. Lee3https://orcid.org/0000-0002-4887-8272ZetaElec Company, Ltd., Ansan, South KoreaSchool of Electrical Engineering, Hanyang University ERICA Campus, Ansan, South KoreaSchool of Electrical Engineering, Hanyang University ERICA Campus, Ansan, South KoreaSchool of Electrical Engineering, Hanyang University ERICA Campus, Ansan, South KoreaThe transition between Grid-Forming (GFM) and Grid-Following (GFL) modes is critical for adapting to changing power grid conditions. These transitions are essential for protecting grid-connected inverter systems and ensuring reliable power supply. However, abrupt changes during the transition process can disrupt both internal and external control loops, potentially causing voltage and current distortions that jeopardize system stability. This challenge is particularly significant when transitioning between GFL and GFM modes under unbalanced load conditions. To address this, this paper proposes a seamless control strategy that enables dynamic and stable transitions between GFL and GFM modes, even under unbalanced three-phase voltage conditions. The proposed approach is based on three key criteria that ensure stability during transitions across various grid scenarios. Additionally, a simple yet effective method for extracting positive and negative sequence components using digital filters is introduced to facilitate the seamless control implementation. The effectiveness of the control strategy is validated through extensive simulations and experiments using a 300 kVA hardware setup. The results demonstrate successful seamless transitions under unbalanced conditions while maintaining a total harmonic distortion (THD) of less than 3%. This method significantly enhances the stability and reliability of power systems, especially in environments characterized by varying grid strengths.https://ieeexplore.ieee.org/document/11088226/Grid-forming (GFM)grid-following (GFL)seamless transition controlvoltage unbalancedbalancing controlpositive & negative sequence |
| spellingShingle | Hyun J. Kim Ho J. Lee Min S. Kim Eun S. Lee Seamless Transition Control Method of Grid-Connected Inverters Under Unbalanced Voltage Conditions IEEE Open Journal of Power Electronics Grid-forming (GFM) grid-following (GFL) seamless transition control voltage unbalanced balancing control positive & negative sequence |
| title | Seamless Transition Control Method of Grid-Connected Inverters Under Unbalanced Voltage Conditions |
| title_full | Seamless Transition Control Method of Grid-Connected Inverters Under Unbalanced Voltage Conditions |
| title_fullStr | Seamless Transition Control Method of Grid-Connected Inverters Under Unbalanced Voltage Conditions |
| title_full_unstemmed | Seamless Transition Control Method of Grid-Connected Inverters Under Unbalanced Voltage Conditions |
| title_short | Seamless Transition Control Method of Grid-Connected Inverters Under Unbalanced Voltage Conditions |
| title_sort | seamless transition control method of grid connected inverters under unbalanced voltage conditions |
| topic | Grid-forming (GFM) grid-following (GFL) seamless transition control voltage unbalanced balancing control positive & negative sequence |
| url | https://ieeexplore.ieee.org/document/11088226/ |
| work_keys_str_mv | AT hyunjkim seamlesstransitioncontrolmethodofgridconnectedinvertersunderunbalancedvoltageconditions AT hojlee seamlesstransitioncontrolmethodofgridconnectedinvertersunderunbalancedvoltageconditions AT minskim seamlesstransitioncontrolmethodofgridconnectedinvertersunderunbalancedvoltageconditions AT eunslee seamlesstransitioncontrolmethodofgridconnectedinvertersunderunbalancedvoltageconditions |