Fast Grid Voltage Synchronization Using Modified FLL in Single-Phase Grid-Connected Power Systems

Autor:	M. Ehsanian, H. Hassanpour
Rok vydání:	2021
Předmět:	Phase-locked loop Synchronization (alternating current) Electric power system Frequency-locked loop Computer science Settling time Control theory Integrator General Engineering Transient response DC bias
Zdroj:	International Journal of Engineering. 34
ISSN:	1735-9244 2423-7167
DOI:	10.5829/ije.2021.34.06c.06
Popis:	One of the critical components for the efficient operation of single-phase grid-connected converters is the synchronization unit. This paper presents a fast and adaptive phase-locked loop (PLL) structure that ameliorates the dynamic response of the estimated frequency and amplitude for grid-connected single-phase power systems. The second-order generalized integrator (SOGI) with a novel frequency-locked loop (FLL) is utilized which contains a DC offset rejection loop. The proposed method not only eliminates the transient response of the estimated frequency which is produced by FLL in grid voltage phase angle jumps, but also improves the PLL dynamic characteristics. The whole system has been simulated in MATLAB Simulink environment where a very small settling time for the estimated frequency of the FLL has been achieved. Therefore, it will improve the whole dynamic parameters of the system. Based on the simulation results, the settling time for the estimated frequency and amplitude are 22 ms and 10 ms, respectively.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::110cd1e32977a9c4a1ccf11e3f368b2d https://doi.org/10.5829/ije.2021.34.06c.06 Zobrazit plný text záznamu