Evaluation of DC-DC-Converter Impedance Passivity Using Pseudo-Random Test Signals

Konferenz: PCIM Europe 2018 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05.06.2018 - 07.06.2018 in Nürnberg, Deutschland

Tagungsband: PCIM Europe 2018

Seiten: 8Sprache: EnglischTyp: PDF

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Ott, Leopold; Han, Yunchao; Wunder, Bernd (Fraunhofer Institute IISB, Germany)
Maerz, Martin (University Erlangen-Nuremberg, Germany)
Bodensteiner, Fabian (Blacbird Technologies, Germany)

DC microgrids have recently attracted attention from academic and industrial research since they offer a multifunctional and efficient way to locally interconnect energy resources as well as loads. By applying the DC link voltage as an ubiquitous accessible parameter for all components, defined low-flow conditions both under grid-tied and islanded operation can be realized using voltage droop curves. However, due to lacking system inertia stabilizing conventional AC grids, stability of a DC microgrid entirely depends on the control loop setup and grid-side passive components of its power electronic converters. In the following, the passivity-based stability criterion is selected as design basis. A simple analytical way to set up droop-controlled power electronic converters for stable grid operation is introduced. Lastly, the chosen approach is verified in a practical trial by complex impedance measurements using pseudo-random test signals.