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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.