Harmonic Impedance Model of Multiple Utility-Interactive Multilevel Photovoltaic Inverters

Christian A. Rojas, Samir Kouro, Ruben Inzunza, Yasuaki Mitsugi and Abraham M. Alcaide ()
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Christian A. Rojas: Department of Electronic Engineering, Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile
Samir Kouro: Department of Electronic Engineering, Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile
Ruben Inzunza: Toshiba Mitsubishi-Electric Industrial Systems Corporation, Tokyo 104-0031, Japan
Yasuaki Mitsugi: Toshiba Mitsubishi-Electric Industrial Systems Corporation, Tokyo 104-0031, Japan
Abraham M. Alcaide: Electronic Engineering Department, Universidad de Sevilla, 41004 Sevilla, Spain

Energies, 2022, vol. 15, issue 24, 1-21

Abstract: An important requirement of the power grid with high penetration of renewable energy sources is the mitigation of potential harmonic interactions between different distributed large grid-tie inverters and the mains. This work presents the harmonic interaction between multiple multilevel photovoltaic (PV) inverters based on the well-known T-type neutral-point-clamped inverter (3L-TNPC). The multiple 3L-TNPC is connected in parallel to a common ac bus by using distribution voltage feeders. The analysis is performed by using the Norton equivalence model of each power circuit, its admittance matrix modeling, and the potential overall impedance resonances with the ac grid. The main contribution of this work is the development of a current harmonic injection model of the system operating under a polluted voltage grid for harmonic analysis, while overall filtering design restrictions due to impedance limits based on current and voltage standards are considered. The proposed impedance Norton model is compared with the electromagnetic transient model (EMT model) by using comprehensive simulations, showing good match between both models.

Keywords: PV applications; multilevel converters; grid-tie PV converters; Norton model; harmonic analysis (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: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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