Konstantopoulos, George C., Zhong, Qing-Chang and Ming, Wen-Long  ORCID: https://orcid.org/0000-0003-1780-7292
2016.
PLL-less nonlinear current-limiting controller for single-phase grid-tied inverters: design, stability analysis, and operation under grid faults.
IEEE Transactions on Industrial Electronics
63
(9)
, pp. 5582-5591.
10.1109/TIE.2016.2564340
|
Abstract
A nonlinear controller for single-phase grid-tied inverters, that can operate under both a normal and a faulty grid with guaranteed closed-loop stability, is proposed. The proposed controller acts independently from the system parameters, does not require a phase-locked loop, and can achieve the desired real power regulation and unity power factor operation. Based on nonlinear input-to-state stability theory, it is analytically proven that the inverter current always remains below a given value, even during transients, independently from grid variations or faults (short circuit or voltage sag). The desired performance and stability of the closed-loop system are rigorously proven since the controller has a structure that does not require any switches, additional limiters, or monitoring devices for its implementation. Therefore, nonlinear stability of a grid-tied inverter with a given current-limiting property is proven for both normal and faulty grid conditions. The effectiveness of the proposed approach is experimentally verified under different operating conditions of the grid.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Engineering |
| Publisher: | Institute of Electrical and Electronics Engineers (IEEE) |
| ISSN: | 0278-0046 |
| Date of Acceptance: | 28 March 2016 |
| Last Modified: | 02 Nov 2022 11:34 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/102460 |
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