PSSE damping constant

ruk
41 ●4 ●5 ●5

Hi! The swing equation PSSE use is given in the program application guiden in section 14.4.4, equation 14.2. The constant De is told to "give an approximate representation of the damping effect contributed by the speed sensitivity of system loads" and that De "represents the variation of electrical load with frequency". What do they mean by that and what type of damping are they approximating? I have read the manual a few times but I cant really understand what they are meaning with the damping term D_e. Maybe someone have an example etc. that can explain this better?

Kind regards

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answered Jul 5 '13

Eli Pack

761 ●2 ●10 ●20

I believe the effect they are referring to is load relief. Motors naturally respond to a reduction in frequency by reducing their load. The net load from different systems will have different proportions of motor loads, so it must be configurable. In mainland Australia for example; for every 1% change in frequency, there is approximately a 1.5% change in demand. For configuring the load frequency model, see section 9.9 (Load Frequency Model) of the MODELS guide.

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answered Aug 11 '13

EBC
151 ●4 ●6

Power Generation, Operation, and Control book contains a very good explanation of the load damping within a generator model, Section 9.3 page 332. Check it out.

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PSSE damping constant

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