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PLL-less nonlinear current-limiting controller for single-phase grid-tied inverters: design, stability analysis, and operation under grid faults

Konstantopoulos, George C., Zhong, Qing-Chang and Ming, Wen-Long 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

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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: Engineering
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
ISSN: 0278-0046
Date of Acceptance: 28 March 2016
Last Modified: 07 Feb 2019 16:10
URI: http://orca.cf.ac.uk/id/eprint/102460

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