Abstract
Oscillation phenomenon of grid-connected inverter can be caused due to time-varying grid impedance. Terminal output impedance of inverter can be reshaped by re-tuning internal parameters of inverter to mitigate the oscillation issue. However, it's not easy to obtain internal parameters of grid-connected inverter in practical operation. This paper presents a gray-box parameters identification method to identify the parameters of LCL filter, the proportional coefficient of current controller and capacitor-current-feedback coefficient from the measured terminal impedance frequency responses by using vector fitting algorithm. When instability phenomenon of multiple-paralleled inverters system occurs, the internal parameters of each inverter are first identified by using the proposed method. Then, the capacitor-current-feedback coefficients are re-tuned to stabilize the studied power system according to the impedance-based stability criterion. The re-designed parameters for the specific grid condition can be delivered to the manufacturers for further parameters modification. Simulation results are given to validate the proposed gray-box parameter identification and corresponding impedance reshaping method.
| Original language | English |
|---|---|
| Title of host publication | ICPE 2019 - ECCE Asia - 10th International Conference on Power Electronics - ECCE Asia |
| Editors | Sewan Choi |
| Place of Publication | Piscataway NJ USA |
| Publisher | IEEE, Institute of Electrical and Electronics Engineers |
| Pages | 2660-2667 |
| Number of pages | 8 |
| ISBN (Electronic) | 9788957083130 |
| ISBN (Print) | 9781728116129 |
| DOIs | |
| Publication status | Published - 2019 |
| Externally published | Yes |
| Event | International Power Electronics Conference (IPEC-ECCE-ASIA) 2019 - Busan, Korea, South Duration: 27 May 2019 → 30 May 2019 Conference number: 10th https://ieeexplore.ieee.org/xpl/conhome/8786807/proceeding (Proceedings) https://icpe2019.org/ (Website) |
Publication series
| Name | ICPE 2019 - ECCE Asia - 10th International Conference on Power Electronics - ECCE Asia |
|---|---|
| Publisher | IEEE, Institute of Electrical and Electronics Engineers |
| ISSN (Print) | 2150-6078 |
| ISSN (Electronic) | 2150-6086 |
Conference
| Conference | International Power Electronics Conference (IPEC-ECCE-ASIA) 2019 |
|---|---|
| Abbreviated title | ICPE 2019 - ECCE Asia |
| Country/Territory | Korea, South |
| City | Busan |
| Period | 27/05/19 → 30/05/19 |
| Internet address |
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Keywords
- Capacitor-current-feedback coefficient
- Gray-box parameter identification
- Grid-connected inverter
- Impedance reshaping