grid connected photovoltaic power connected PV inverters available on the European market and to outline future trends in this rapidly developing technology. The paper is organized as follows. Section I1 describes PV system designs and discusses safety aspects concerning transformerless topologies. Then some commercially available inverter topologies are presented and discussed and an overview on market shares, price and efficiency developments is given. Section 111 outlines new developments including new system designs such the ‘team ’ and ‘Multi-string ’ inverter concept and discusses new transformerless topologies. Section IV summarises the main fmdings and developments. 11. COMMERCIALLY AVAILABLE INVERTER TOPOLOGIE
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