Impact Factor:5.462
DOI number:10.1109/JESTPE.2020.3047964
Journal:IEEE Journal of Emerging and Selected Topics in Power Electronics
Place of Publication:United States
Key Words:Impedance model, stability, voltage-source converter.
Abstract:With the increasing penetration of power-electronicbased renewable generations, stability issues become challenging due to interactions between converters and the grid. This article develops a framework to investigate the stability of grid-tied photovoltaic inverter systems using impedance models (IMs). IMs are developed considering the complete system dynamics for both proportional-integral (PI) control and proportionalresonance (PR) control structures. Different stability investigation methods are elaborated with a focus on the Bode plot and the generalized Nyquist criterion. Sensitivity analyses are conducted utilizing Bode plots to observe the impact of different factors in the frequency domain. Followed by that, an impedance-resonance analysis method is proposed to identify the cause of resonances according to the critical interactions of diagonal impedances and the frequency range of resonances. The performance of PI and PR controls is compared with a focus on the influence of the outer control loops. The analyses are validated through experiments in a down-scale test bench.
Indexed by:Journal paper
Discipline:Engineering
Document Type:J
Volume:10
Issue:3
Page Number:2672-2684
ISSN No.:2168-6777
Translation or Not:no
Date of Publication:2020-12-29
Included Journals:SCI
Links to published journals:https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6245517