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frequency response REPCA

asked 2020-08-21 10:17:01 -0500

pk gravatar image

updated 2020-08-21 10:17:59 -0500

Hello, i am try to perform frequency disturbance test of for PV plant. i need suggestion for 2 things

  • How to change frequency in REPCA , i am changing L+3 VAR reference frequency .it change frequency signal as spike and within sec recover at original value.
  • when freq increase MW should be decrease but in my model MW increase and remain constant after change but frequency signal show spike of 10^-7 return to its original value
  • How to plot frequency with respect to 60 HZ , i am using function 60*(1+a) but not able to get .
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answered 2020-08-25 10:41:07 -0500

jconto gravatar image

Do not change L+3 Var. Check the forum for "frequency" and in particular the entry entitled "frequency response test". To perform a frequency disturbance test, you can use the playback model PLBVFU1 or simulate it within the network: drop a generator to get under frequency or drop a load to get an over frequency condition. The PV models are usually set to not responsive to frequency events. For this study, would have appropriate parameters like its 'frequency control' flags activated. Add bus frequency channels to the run and plot using the scale function 60*(1+a). When plotting, adjust scale around 60.

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Curious why you say not to change VAR L+3? I often do this on "single-machine-infinite-bus" PSSE cases to evaluate the frequency control parameters for new IBR's in a similar approach to the "GRUN" governor response test and ensure the active power ramp-rate meets requirements.

oppossumX gravatar imageoppossumX ( 2020-08-26 19:30:43 -0500 )edit

I am assuming the intention of the study is to verify the PV plant frequency response to a system event. If so, the parameters of the PV plant models are set before the event and not changed during the simulation to get its 'natural' frequency response. A GRUN test is not valid for NERC MOD-027

jconto gravatar imagejconto ( 2020-08-27 09:05:02 -0500 )edit

Thanks Jconto, you are correct i am trying to verify frequency response of system event as per new ERCOT guideline.Yes, PLBVFU model help to achieve it.

pk gravatar imagepk ( 2020-08-27 12:05:39 -0500 )edit

answered 2020-08-22 20:18:51 -0500

oppossumX gravatar image

The L+3 VAR is frequency reference, not frequency. It is defined in per-unit frequency deviation from nominal. Increasing this is raising the set-point of the frequency control so your machine is responding by increasing its active power to raise the frequency to this new set-point. Sounds like you want to lower the frequency reference not raise it. If your machine is already dispatched to its Pmax it cannot increase its active power beyond this limit.

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Asked: 2020-08-21 10:17:01 -0500

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Last updated: Aug 25