Quasi-Z-Source Inverter-Based Photovoltaic Power System Modeling for Grid Stability Studies

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

Energies, 2021, vol. 14, issue 2, 1-16

Abstract: Quasi-Z-source inverters (qZSIs) are becoming a powerful power conversion technology in photovoltaic (PV) power systems because they allow energy power conversion in a single stage operation. However, they can cause system resonances and reduce system damping, which may lead to instabilities. These stability problems are well known in grid-connected voltage source converter systems but not in quasi-Z-source inverter (qZSI)-based PV power systems. This paper contributes with Matlab/Simulink and PSCAD/EMTDC models of qZSI-based PV power systems to analyze transient interactions and stability problems. These models consider all power circuits and control blocks of qZSI-based PV power systems and can be used in sensitivity studies on the influence of system parameters on stability. PV power system stability is assessed from the proposed models. The causes of instabilities are analyzed from numerical simulations and possible solutions are proposed.

Keywords: photovoltaics; quasi-Z-source inverter; small-signal model; state-space model (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 (6)

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