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

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.

Inspec keywords: maximum power point trackers; invertors; photovoltaic power systems

Other keywords: half-bridge topology; maximum power extraction; grid-tied single-phase inverter; series connected photovoltaic sources; simultaneous maximum power point tracking; neutral point clamped multilevel inverter; voltage quality; generation control circuit; partial shadowing conditions; photovoltaic arrays; independent photovoltaic sources; grid-tie inverter topology

Subjects: Power electronics, supply and supervisory circuits; Solar power stations and photovoltaic power systems

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http://iet.metastore.ingenta.com/content/journals/10.1049/iet-rpg.2013.0143
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