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Hello PSSE community,

I currently have a small network (IEEE 9-Bus) with about 20% of renewable generation in the form of WT4G2 (with WT4E2 and REPCTA1). I am struggling because the response of my system to a load increase (0.5 pu) is not as I expect:

1) VAL+3 (frequency reference) of my wind machines is set at zero. I manually edit this to 1pu after initializing, however, I get no difference in the frequency response of my system, stays at the frequency Nadir. Where does the model get this reference from?

2) The frequency drop in my mix scenario (renewables and SG) is very slow compared to my scenario with only SG (I cannot my screenshot to show, but with only SG in 2.1 sec I reach nadir, but with wind at 8.2 sec I reach nadir) and the Nadir does not change to a lower value (expected for a lower inertia).

My procedure has been: run steady state unit 1sec and then have a load increase of 0.5 up, running to 15sec or 30sec after.

Hello PSSE community,

I currently have a small network (IEEE 9-Bus) with about 20% of renewable generation in the form of WT4G2 (with WT4E2 and REPCTA1). I am struggling because the response of my system to a load increase (0.5 pu) is not as I expect:

1) VAL+3 (frequency reference) of my wind machines is set at zero. I manually edit this to 1pu after initializing, however, I get no difference in the frequency response of my system, stays at the frequency Nadir. Where does the model get this reference from?

2) The frequency drop in my mix scenario (renewables and SG) is very slow compared to my scenario with only SG (I cannot my screenshot to show, but with only SG in 2.1 sec I reach nadir, but with wind at 8.2 sec I reach nadir) and the Nadir does not change to a lower value (expected for a lower inertia).inertia). i am using standard GE and Siemens models provided in the manuals.

My procedure has been: run steady state unit 1sec and then have a load increase of 0.5 up, running to 15sec or 30sec after.