This paper presents a transformerless single-phase solar inverter circuit with a three level output voltage. It is well suited for thin-film or back-side contacted solar modules because one pole of the solar module can be directly connected to the neutral conductor. The circuit uses a flying capacitor for one of both half-waves, requires only five transistors and is capable of delivering inductive as well as capacitive reactive power.
A Transformerless Single-Phase PV Inverter Circuit for Thin-Film or Back-Side Contacted Solar Modules
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IECON 2014, 40th Annual Conference of the IEEE Industrial Electronics Society, Dallas