The German Solar Industry Association (BSW) has presented intermediate results for its PV-LEO research project. The project team was able to produce a choke based on the interleaved principle (two power stages operating with a phase offset of 180 degrees) for a boost converter. As a result, the volume can be reduced by about 30 percent compared to two conventional chokes. Despite the new design, chokes are still responsible for 20 to 30 percent of the overall weight of inverters developed as part of the PV-LEO project, states BSW. The project team sees further potential for improvement here, as well as in the cooling system. With the resulting weight savings, the project’s goal is to achieve a weight of 1 kg per kW.
PV-LEO was launched in 2014 and will come to a close on Sept. 30, 2017. Alliance partners include inverter maker Kaco new energy GmbH, the Fraunhofer Institute for Wind Energy and Energy System Technology (IWES) in Kassel, Infineon Technologies AG and Sumida Components & Modules GmbH. The ultimate goal of the project, funded with €4.4 million is to significantly improve the reliability of inverters in extreme climatic environments, performance density and manufacturing costs.
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