Sub- and Super-Synchronous Characteristic of a Transformer Connected STATCOM Using Grid-Forming Control Method

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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Winter, Pascal; Cajigal-Nunez, Jose M.; Wrede, Holger (Hochschule Düsseldorf – University of Applied Sciences, Münsterstr. 156, 40476 Düsseldorf, Germany)

The progression of the energy transition causes an increasing penetration of converter-based grid components, resulting in a change of the overall grid characteristics. Because the behavior of grid-connected converters is essentially specified by the implemented control, the requirements on these control algorithms increase. Besides the consideration of the fundamental system stability, the maintenance of the voltage quality in future distribution grids becomes an important issue. This contribution presents the concept of a transformer coupled medium voltage converter as STATCOM with energy storage. Based on this topology, damping of harmonic and subharmonic distortions in the grid is improved which results from a voltage source behavior regarding the fundamental grid voltage as well as a current source behavior for harmonic currents of the subordinated grid.