Gnetting the generators

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There are a few generators in the network whose dynamic models are not available. To proceed with dynamic simulation, I am supposed to gnet the said generators (convert them into negative loads). One strange behaviour I have noticed is that after initialization and no-disturbance run for x seconds, I see the gnetted buses have loads with 0 MW and 0 Mvar. It may be noted that the generator conversion activity is performed prior to gnetting. What could be the possible cause? Any help will be highly appreciated. Thanks.

answered Aug 16 '2

perolofl

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When machines with missing generator models are gnetted automatically at initialisation Pgen is modelled as constant current load and Qgen is modelled as contant impedance load. Both Pload and Qload are zero!

In the example below I have deleted the generator model for machine at bus 102 in savnw network. After initialisation, the machine is gnetted and replaced with a load:

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The load data are shown below:

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That's right @perolofl. I see the same results in the savnw network. However, in my case, all of the load data entries become zero, i.e., Pload=Qload=IPload=IQload=YPload=YQload=0. It may be noted that these parameters do not become right after gnetting, rather they become zero after initialization.

abdul (Aug 17 '2)

Can you show the data for the plant?

perolofl (Aug 17 '2)

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Gnetting the generators

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