Grid-tie inverter topology with maximum power extraction from two photovoltaic arrays

Iván Patrao; Gabriel Garcerá; Emilio Figueres; Raúl González-Medina

Grid-tie inverter topology with maximum power extraction from two photovoltaic arrays

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Author(s): Iván Patrao ¹ ; Gabriel Garcerá ¹ ; Emilio Figueres ¹ ; Raúl González-Medina ¹
- Affiliations: 1: Departamento de Ingeniería Electrónica, Universitat Politécnica de Valencia, Grupo de Sistemas Electrónicos Industriales del Camino de Vera s/n, 46022 Valencia, Spain
Source: Volume 8, Issue 6, August 2014, p. 638 – 648
DOI: 10.1049/iet-rpg.2013.0143 , Print ISSN 1752-1416, Online ISSN 1752-1424

Received 20/05/2013, Accepted 02/12/2013, Revised 24/10/2013, Published 17/02/2014

This study presents a transformerless topology for a grid-tied single-phase inverter capable of performing the simultaneous maximum power point tracking of two independent and series connected photovoltaic sources. This topology is derived from the neutral point clamped multilevel inverter in half-bridge configuration. The use of a half-bridge topology reduces the leakage current to very low values, whereas the multilevel topology presents an output voltage quality similar to that of a full-bridge inverter. To simultaneously track the maximum power of both photovoltaic sources, a generation control circuit is used. With this topology, it is possible to improve the performance of the converter under partial shadowing conditions, very common in photovoltaic facilities operating in residential areas. A 5 kW prototype of this topology has been implemented and tested in the laboratory.

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Grid-tie inverter topology with maximum power extraction from two photovoltaic arrays

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