Matthias Seifert

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Doubly-fed induction generators (DFIG) still play an important role in wind-energy applications. One of the major challenges concerning their operation is to meet not only steadystate, but also dynamic requirements. State-of-the-art DFIGs are often controlled applying dq-control structures to guarantee steady-state power-quality requirements. The need of an(More)
Doubly-fed induction generators (DFIG) still play an important role in wind-energy applications. One of the major challenges concerning their operation is to meet not only steady-state, but also dynamic requirements. State-of-the-art DFIGs are often controlled applying dq-control structures to guarantee steady-state power-quality requirements. The need of(More)
State-of-the-art control approaches often neglect the time-variant characteristics of power-electronic systems in favour of a time-averaged approach. In consequence, the resulting system is partly instable, thus, not optimally controlled. The pole-restraining control (PRC) removes the inherent instability, giving considerably improved dynamic behaviour. In(More)
Simulating complex offshore grids including connected devices and independent control algorithms (e.g. in DLL form) is essential for the assessment of global system stability. In power-electronic applications - due to independently controlled and independently switching inverters - only time domain simulation can give meaningful results. This paper presents(More)
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