development of a single-stage three-phase pv module

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Development of a Single-Stage Three-Phase PV Module Integrated Con verter Benjamin Sahan, Antonio Notholt-V ergara, Alfred Engler , Peter Zacharias Institut f ¨ ur Solare Energieversorgungstechnik, ISET e.V. K ¨ onigstor 59, D-34119 Kassel, Germany Phone: +49 561 7294127 Fax: +49 561 7294400 Email: bsahan@ise t.uni-kassel.d e URL: http://www .iset.uni-kas sel.de Acknowledgments The authors would like to thank the European Commission for their support in the project ”PV-MIPS” (Contr act No. TREN/ 04/FP6EN/S07. 34959/50 3123). It should be noted that this article refle cts only the author’s views and the European Commission is not liable for any use that may be made of the information contained therein. Keywords Current source inverter (CSI), Photovoltaic, Renewable energy systems, Three-phase system, Efficiency. Abstract A transformerless three-phase power conditioning unit interfacing with a high voltage (>200V) pho- tovo ltaic module is prese nted. The chosen topology , a Curre nt Source In verte r, featur es a single- stage power conversion system that feeds directly into the grid. A robust and highly efficient laboratory proto- type of a Module Integrated Converter has been implemented and demonstrated by experimental results. Introduction In grid-connected photovoltaic applications central and string inverters are the most commonly used system configur ations . By integrat ing the inv erter into the PV module and generati ng a grid complian t ac output current several system advantages can be achieved [1],[2],[3]: • Ease of installa tion through flexibl e PV system design, offer ing ”plug and play” features • PV system redundancy in case of inverter failure • No modu le mis mat ch losses due to shad ing or ali gnme nt in dif fer ent angle s due to indivi dua l Maximum Power Point Tracking (MPPT) • No DC cabling • Possibl e mass production through high quantiti es and standardise d components Despit e the benefits of so called Module Integr ated Converters (MICs) and sev eral researc h eff orts this concep t was not commerci ally successf ul yet [5]. For the most part, this is due to low reliabili ty , high cost, complexity or poor efficiency of the existing devices. Given that a PV system should have a lifespan of >20 years, reliabili ty is a key issue, especially when module integ ration is concerne d. High peak temperature stress and thermal cycling requires a highly robust design. Elect rolyti c capacitors , widely

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Page 1: Development of a Single-Stage Three-Phase PV Module

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