## What is/are Third Order Generalized?

Third Order Generalized - As a high-end version of the SOGI-FLL, the third-order generalized integrator frequency-locked loop (TOGI-FLL) is proposed in this paper, achieving better filtering ability and faster dynamic response.^{[1]}This controller incorporates the second- and third-order generalized integrator-based filter for fundamental component extraction of grid voltage and has the benefits of both the filters.

^{[2]}The synchronization of VSC with the utility grid is carried out using an enhanced third-order generalized integrator (ETOGI).

^{[3]}Meanwhile, a third-order generalized integral flux observer is applied in this article, providing evidence of torque ripple reduction.

^{[4]}An enhanced third-order generalized integrator (TOGI) method has been proposed for the estimation of grid frequency and the synchronizing signals.

^{[5]}In this paper, the basic principle and characteristics of a phase-locked loop (PLL) in a single phase grid-connected system are analyzed, and this paper introduces one type virtual orthogonal voltage vector method based on a third order generalized integrator (TOGI) to construct an alpha and beta static coordinate system.

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