The oscillation range of photovoltaic frequency in this picture is very small, about 0.02Hz, can it be applied to microgrids? Is this a low frequency oscillation?
This is a very low frequency, hence should not affect the micro grid power frequency
It is NOT a low frequency oscillation but it's narrow band PV oscillation at nominal grid frequency i.e. 50Hz.
For microgrids, this can still cause an issue depending on what size or load is attached to grid to which the solar PV system is connected to, since solar PV is highly dependent on varying solar intensity at location, time of day.
In industrial scale, the loads may vary widely during the day, night times and frequency at which load shedding occurs, so it is uncertain to comment whether it can fit into such scenarios.
What standard is applicable for you? IEC, IEEE?
Also, what if the frequency of this oscillation of the fundamental frequency?
This degree of oscilation is too small to use it as a baseline for controling demand-response for example. But maybe in certain cases where an accurate and reliable frequency must be there, it might be an option to check also for small bandwiths to intevene.
Because this frequency is very low, therefore, there is no problem and affection.
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