Repetitive Controller for Low Grid Current Harmonics in a Hybrid Parallel Electrolysis Rectifier

Conference: NEIS 2019 - Conference on Sustainable Energy Supply and Energy Storage Systems
09/19/2019 - 09/20/2019 at Hamburg, Deutschland

Proceedings: NEIS 2019

Pages: 7Language: englishTyp: PDF

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Bintz, Steffen; Haarer, Joerg; Roth-Stielow, Joerg (Institute for Power Electronics and Electrical Drives, University of Stuttgart, Pfaffenwaldring 47, 70569 Stuttgart, Germany)

As water electrolysis for energy storage or sector coupling becomes more relevant, suitable rectifiers for grid integration are needed. A promising rectifier concept for this application is a combination of a thyristor rectifier, which offers a high efficiency at the needed high currents, and a parallel voltage source inverter (VSI) for grid current correction and DC-output smoothing at the same time [1]. However, as the desired low grid current harmonics can only hardly be achieved with a conventional controller, a repetitive control concept for the VSI is introduced. The proposed system is verified with measurements on a 5 kW demonstrator circuit of the proposed topology.