Experimental Short-Circuit Testing of Grid-Forming Inverters in Microgrid and Interconnected Mode

Conference: NEIS 2018 - Conference on Sustainable Energy Supply and Energy Storage Systems
09/20/2018 - 09/21/2018 at Hamburg, Deutschland

Proceedings: NEIS 2018

Pages: 6Language: englishTyp: PDF

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Duckwitz, D.; Welck, F.; Gloeckler, C. (Fraunhofer IEE, Kassel, Germany)
Knobloch, A.; Becker, T.; Buelo, T. (SMA Solar Technology AG, Niestetal, Germany)

Power systems with increasing renewable generation are subject to intermittent, at times very high, penetration rates of power electronic generation plants. Grid-forming control schemes are potentially required to guarantee stability at high penetration rates. These schemes introduce voltage-source behavior and replicate the high fault currents of synchronous machines. Adapted control schemes have been developed to reduce fault currents of grid-forming inverters. This contribution presents experimental results on the short-circuit behavior of two grid-forming inverters, one commercial prototype and one experimental device. Two different operation modes, grid-connected and islanded, have been investigated and the different requirements are discussed along the results. The grid-forming schemes are potentially able to follow the same short-circuit requirements as current-controlled plants, but provide a fast inherent reaction to faults.