Observer-based pulsed signal injection for grid impedance estimation in three phase systems
This paper addresses the estimation of the grid impedance and the control of grid-tied converters by combining pulsed-signal injection and observer based techniques. A Luenberger based observer is used for controlling the grid-side current of an LCL filter by only measuring the converter-side curren...
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| Format: | Article |
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Institute of Electrical and Electronics Engineers
2018
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| Online Access: | https://eprints.nottingham.ac.uk/49648/ |
| _version_ | 1848798046410768384 |
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| author | Garcia, Pablo Sumner, M. Navarro-Rodríguez, Ángel Guerrero, Juan M. Garcia, Jorge |
| author_facet | Garcia, Pablo Sumner, M. Navarro-Rodríguez, Ángel Guerrero, Juan M. Garcia, Jorge |
| author_sort | Garcia, Pablo |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | This paper addresses the estimation of the grid impedance and the control of grid-tied converters by combining pulsed-signal injection and observer based techniques. A Luenberger based observer is used for controlling the grid-side current of an LCL filter by only measuring the converter-side currents and the grid-side voltage. This configuration mitigates the effects of parameter variation at the LCL filter. Under grid impedance changes, the observer control signal will be used for triggering the signal injection. A Pulsed Signal Injection (PSI) approach is employed for estimating online the grid impedance using an RLS algorithm. Compared with existing grid-impedance estimation techniques, the proposed method can: 1) identify a generic RL grid impedance, even under unbalanced conditions; 2) reduce the distortion induced by the excitation signal by relying on the observer to triggering the injection when a grid impedance change is detected; 3) Identify grid impedance values much lower than the converter filter impedance, which is the usual situation when the converter rated power is well below the grid rating. Finally, it is worth pointing out that the proposed estimation technique is well suited to be incorporated into an adaptive current controller scheme. |
| first_indexed | 2025-11-14T20:13:33Z |
| format | Article |
| id | nottingham-49648 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T20:13:33Z |
| publishDate | 2018 |
| publisher | Institute of Electrical and Electronics Engineers |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-496482020-05-04T19:30:56Z https://eprints.nottingham.ac.uk/49648/ Observer-based pulsed signal injection for grid impedance estimation in three phase systems Garcia, Pablo Sumner, M. Navarro-Rodríguez, Ángel Guerrero, Juan M. Garcia, Jorge This paper addresses the estimation of the grid impedance and the control of grid-tied converters by combining pulsed-signal injection and observer based techniques. A Luenberger based observer is used for controlling the grid-side current of an LCL filter by only measuring the converter-side currents and the grid-side voltage. This configuration mitigates the effects of parameter variation at the LCL filter. Under grid impedance changes, the observer control signal will be used for triggering the signal injection. A Pulsed Signal Injection (PSI) approach is employed for estimating online the grid impedance using an RLS algorithm. Compared with existing grid-impedance estimation techniques, the proposed method can: 1) identify a generic RL grid impedance, even under unbalanced conditions; 2) reduce the distortion induced by the excitation signal by relying on the observer to triggering the injection when a grid impedance change is detected; 3) Identify grid impedance values much lower than the converter filter impedance, which is the usual situation when the converter rated power is well below the grid rating. Finally, it is worth pointing out that the proposed estimation technique is well suited to be incorporated into an adaptive current controller scheme. Institute of Electrical and Electronics Engineers 2018-02-05 Article PeerReviewed Garcia, Pablo, Sumner, M., Navarro-Rodríguez, Ángel, Guerrero, Juan M. and Garcia, Jorge (2018) Observer-based pulsed signal injection for grid impedance estimation in three phase systems. IEEE Transactions on Industrial Electronics . ISSN 1557-9948 Impedance Observers Voltage control Voltage measurement Frequency estimation Adaptation models http://ieeexplore.ieee.org/document/8281120/ doi:10.1109/TIE.2018.2801784 doi:10.1109/TIE.2018.2801784 |
| spellingShingle | Impedance Observers Voltage control Voltage measurement Frequency estimation Adaptation models Garcia, Pablo Sumner, M. Navarro-Rodríguez, Ángel Guerrero, Juan M. Garcia, Jorge Observer-based pulsed signal injection for grid impedance estimation in three phase systems |
| title | Observer-based pulsed signal injection for grid impedance estimation in three phase systems |
| title_full | Observer-based pulsed signal injection for grid impedance estimation in three phase systems |
| title_fullStr | Observer-based pulsed signal injection for grid impedance estimation in three phase systems |
| title_full_unstemmed | Observer-based pulsed signal injection for grid impedance estimation in three phase systems |
| title_short | Observer-based pulsed signal injection for grid impedance estimation in three phase systems |
| title_sort | observer-based pulsed signal injection for grid impedance estimation in three phase systems |
| topic | Impedance Observers Voltage control Voltage measurement Frequency estimation Adaptation models |
| url | https://eprints.nottingham.ac.uk/49648/ https://eprints.nottingham.ac.uk/49648/ https://eprints.nottingham.ac.uk/49648/ |