The synchronization between power grid and distributed power sources is a crucial issue in the concept of smart grids. For tracking the real-time frequency and phase of three-phase grids, phase-locked loop (PLL) technology is commonly used. Many existing PLLs with enhanced disturbance/harmonic rejection capabilities, either fail to maintain the fast response or are not adaptive to grid frequency variations or have high computational complexity. This paper therefore proposes a low computational burden Repetitive Controller (RC) assisted PLL (RCA-PLL) that is not only effective on harmonic rejection, but also has remarkable steady-state performance while maintaining fast dynamic. Moreover, the proposed PLL is adaptive to variable frequency conditions and can self-learn the harmonics to be cancelled. The disturbance/harmonic rejection capabilities together with dynamic and steady-state performances of the RCA-PLL have been highlighted in the paper. The proposed approach is also experimentally compared to the synchronous rotation frame PLL (SRF-PLL) and the Steady-State Linear Kalman filter PLL (SSLKF-PLL), considering the effect of harmonics from the grid-connected converters, unbalances, sensor scaling errors, d.c. offsets, grid frequency variations and phase jumps. The computational burden of the RCA-PLL is also minimized, achieving an experimental execution time of only 12 µs.

Tang, M., Bifaretti, S., Pipolo, S., Odhano, S., Zanchetta, P. (2019). A Novel Repetitive Controller Assisted Phase-Locked Loop with Self-learning Disturbance Rejection Capability for Three-phase Grids. IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS, 1-1 [10.1109/JESTPE.2019.2941835].

A Novel Repetitive Controller Assisted Phase-Locked Loop with Self-learning Disturbance Rejection Capability for Three-phase Grids

Bifaretti, Stefano;
2019-09-01

Abstract

The synchronization between power grid and distributed power sources is a crucial issue in the concept of smart grids. For tracking the real-time frequency and phase of three-phase grids, phase-locked loop (PLL) technology is commonly used. Many existing PLLs with enhanced disturbance/harmonic rejection capabilities, either fail to maintain the fast response or are not adaptive to grid frequency variations or have high computational complexity. This paper therefore proposes a low computational burden Repetitive Controller (RC) assisted PLL (RCA-PLL) that is not only effective on harmonic rejection, but also has remarkable steady-state performance while maintaining fast dynamic. Moreover, the proposed PLL is adaptive to variable frequency conditions and can self-learn the harmonics to be cancelled. The disturbance/harmonic rejection capabilities together with dynamic and steady-state performances of the RCA-PLL have been highlighted in the paper. The proposed approach is also experimentally compared to the synchronous rotation frame PLL (SRF-PLL) and the Steady-State Linear Kalman filter PLL (SSLKF-PLL), considering the effect of harmonics from the grid-connected converters, unbalances, sensor scaling errors, d.c. offsets, grid frequency variations and phase jumps. The computational burden of the RCA-PLL is also minimized, achieving an experimental execution time of only 12 µs.
set-2019
Online ahead of print
Rilevanza internazionale
Articolo
Esperti anonimi
Settore ING-IND/32 - CONVERTITORI, MACCHINE E AZIONAMENTI ELETTRICI
English
Con Impact Factor ISI
repetitive control; phase-locked loops; power system harmonics; fault tolerant control
Tang, M., Bifaretti, S., Pipolo, S., Odhano, S., Zanchetta, P. (2019). A Novel Repetitive Controller Assisted Phase-Locked Loop with Self-learning Disturbance Rejection Capability for Three-phase Grids. IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS, 1-1 [10.1109/JESTPE.2019.2941835].
Tang, M; Bifaretti, S; Pipolo, S; Odhano, S; Zanchetta, P
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/238082
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