27‑Level asymmetric multilevel inverter for photovoltaic energy conversion

Rodrigo Aliaga; Diego Rojas; Javier Munoz; Ariel Villalon

27‑Level asymmetric multilevel inverter for photovoltaic energy conversion

Vol. 20, No. 4, pp. 904-915, Jul. 2020

10.1007/s43236-020-00083-x

DC-AC power conversion

Multi-level power inverter

Renewable energy

Abstract

This paper presents a novel structure to inject the electric energy from photovoltaic modules to the grid based on a 27-level asymmetric multilevel inverter. This work proposes mixing existing approaches based on string and central inverters to implement a hybrid structure that generates highly sinusoidal waveforms. Indeed, the presented structure allows for a staircase AC voltage waveform with a low level of harmonic distortion, which is a key feature for photovoltaic energy conversion. The proposal is supported with theoretical analyses that include system modeling and a suitable control strategy to track both the active and reactive power. A low power proof-of-concept prototype was built to validate the properness of the proposal. Several dynamic tests were performed, such as severe load impacts, partial shading and fault ride-through capability.

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Cite this article

[IEEE Style]

R. Aliaga, D. Rojas, J. Munoz, A. Villalon, "27‑Level asymmetric multilevel inverter for photovoltaic energy conversion," Journal of Power Electronics, vol. 20, no. 4, pp. 904-915, 2020. DOI: 10.1007/s43236-020-00083-x.

[ACM Style]

Rodrigo Aliaga, Diego Rojas, Javier Munoz, and Ariel Villalon. 2020. 27‑Level asymmetric multilevel inverter for photovoltaic energy conversion. Journal of Power Electronics, 20, 4, (2020), 904-915. DOI: 10.1007/s43236-020-00083-x.