State-Space Model of Quasi-Z-Source Inverter-PV Systems for Transient Dynamics Studies and Network Stability Assessment

Lluís Monjo, Luis Sainz, Juan José Mesas and Joaquín Pedra
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Lluís Monjo: Department of System Engineering and Design, Jaume I University, Av. Vicent sos Baynat s/n, 12071 Castelló de la Plana, Spain
Luis Sainz: Department of Electrical Engineering, Barcelona School of Industrial Engineering (ETSEIB-UPC), Polytechnic University of Catalonia, Av. Diagonal 647, 08028 Barcelona, Spain
Juan José Mesas: Department of Electrical Engineering, Barcelona East School of Engineering (EEBE-UPC), Polytechnic University of Catalonia, Av. Eduard Maristany 16, 08019 Barcelona, Spain
Joaquín Pedra: Department of Electrical Engineering, Barcelona School of Industrial Engineering (ETSEIB-UPC), Polytechnic University of Catalonia, Av. Diagonal 647, 08028 Barcelona, Spain

Energies, 2021, vol. 14, issue 14, 1-15

Abstract: Photovoltaic (PV) power systems are increasingly being used as renewable power generation sources. Quasi-Z-source inverters (qZSI) are a recent, high-potential technology that can be used to integrate PV power systems into AC networks. Simultaneously, concerns regarding the stability of PV power systems are increasing. Converters reduce the damping of grid-connected converter systems, leading to instability. Several studies have analyzed the stability and dynamics of qZSI, although the characterization of qZSI-PV system dynamics in order to study transient interactions and stability has not yet been properly completed. This paper contributes a small-signal, state-space-averaged model of qZSI-PV systems in order to study these issues. The model is also applied to investigate the stability of PV power systems by analyzing the influence of system parameters. Moreover, solutions to mitigate the instabilities are proposed and the stability is verified using PSCAD time domain simulations.

Keywords: PV systems; quasi-Z-source inverter; stability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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