Low-frequency oscillation analysis of two-stage photovoltaic grid-connected system

The low-frequency oscillation (LFO) problem of photovoltaic (PV) grid-connected systems has been a critical concern for safe operation, whereas the impact of dc-side components of PV plants are always ignored and single-stage PV plant is used. This paper performs a comprehensive analysis of the LFOs...

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Bibliographic Details
Published in:	Energy reports Vol. 8; pp. 241 - 248
Main Authors:	Shao, Bingbing, Miao, Zilong, Wang, Liyuan, Meng, Xiaoxiao, Chen, Zhe
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-11-2022 Elsevier
Subjects:	High-frequency oscillation Low-frequency oscillation Small-signal model Two-stage photovoltaic plant Low-frequency oscillation Small-signal model Two-stage photovoltaic plant High-frequency oscillation
Online Access:	Get full text
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Summary:	The low-frequency oscillation (LFO) problem of photovoltaic (PV) grid-connected systems has been a critical concern for safe operation, whereas the impact of dc-side components of PV plants are always ignored and single-stage PV plant is used. This paper performs a comprehensive analysis of the LFOs in the two-stage PV grid-connected system. The complete small-signal model of the two-stage PV system is built. On this basis, the LFO modes and high-frequency oscillation (HFO) modes are calculated and related participating components are determined. Then, the impact of key parameters on the LFO characteristics is investigated with the root locus analysis. The theoretical analysis is verified through PSCAD/EMTDC simulations.
ISSN:	2352-4847 2352-4847
DOI:	10.1016/j.egyr.2022.08.032