Abstract
This paper deals with grid-voltage sensorless synchronization and control under unbalanced grid conditions. A three-phase grid-connected converter equipped with an LCL filter is considered, and no signals other than the converter currents and the dc-link voltage are measured for control. An augmented adaptive state observer is proposed for estimation of the positive- and negative-sequence components of the grid voltage. Dynamic performance limitations of the proposed method and effects of parameter errors are analyzed. The proposed observer is tested as part of a sensorless control system. Experimental results show that the proposed method works well even under highly unbalanced grid conditions.
| Original language | English |
|---|---|
| Pages (from-to) | 286-297 |
| Number of pages | 12 |
| Journal | IEEE Transactions on Industry Applications |
| Volume | 54 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2018 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- observers
- sensorless control
- adaptation models
- estimation error
- frequency estimation
- integrated circuit modeling