Stability Investigation of Power Electronics Systems; A Microgrid Case
Doctoral thesis
Åpne
Permanent lenke
http://hdl.handle.net/11250/281238Utgivelsesdato
2015Metadata
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- Institutt for elkraftteknikk [2503]
Sammendrag
This thesis is focused on the stability of systems containing high power electronic
devices. The study mainly involves the exchanger device in a hybrid current
microgrid. This microgrid has a topology with a DC bus and an AC bus. The
stability analysis was performed for a small signal during short- and long-term
perturbation. The short-term tests are presented in the frequency domain with
the Nyquist stability criteria. This method has several practical advantages that
facilitate its implementation. The long-term tests use eigenvalues and a semirecursive
method to estimate the low frequency equivalent of the microgrid. A
continuation method has been applied to analyze the stability of the system with
the full information about the microgrid. The loadability and controllability of
the system has been tested with this method.