MATLAB SIMPOWERSYSTEMS 5 Manual do Utilizador descarregar pdf (Página 15)

Palestine Polytechnic University

Workshop Matlab/Simulink in Drives and Power electronics – Lecture 418-21 May 2009

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Snubber resistance and capacitance

• Snubber resistance Rs, in ohms (Ω).

– Set the Snubber resistance Rs parameter to inf to eliminate the

snubbers from the model.

• Snubber capacitance Cs, in farads (F).

– Set the Snubber capacitance Cs parameter to 0 to eliminate the

snubbers, or to inf to get a resistive snubber.

– In order to avoid numerical oscillations when your system is

discretized, you need to specify Rs and Cs snubber values for diode

and thyristor bridges. For forced-commutated devices (GTO, IGBT, or

MOSFET), the bridge operates satisfactorily with purely resistive

snubbers as long as firing pulses are sent to switching devices.

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