With the rise in the application of Distributed Energy Resources, RESs and forming Microgrids, these parts have different dynamics compared to Conventional Power Plants(CPPs). Mainly, Power Electronic Interface Generation (PEIGs) don't have any inertia compared to CPPs that causes instability problems and frequency excursions/deviation.
It is mainly confirmed that CPPs determine the dynamics of the power system, meanwhile in the context of microgrid with high penetration of RESs, it should be different.
Thus, It would be great if there will be a discussion here on this subject and clarify it.
In general, the microgrid system will be connected to the main system. But to preserve the security of supply they must also be operable in so-called island mode, i.e., not connected to the main grid. With an increasing number of loads and sources interfaced through Power Electronic (PE) converters, the dynamic behavior of the system is getting more critical. The controllers have to be properly tuned to avoid oscillations and possibly instability.
When the operating states of the (micro)grid changes frequently, the dynamic models of system components must fulfil the requirements to an acceptable response after disturbances as well as to the steady state behavior.
Source:https://www.sintef.no/projectweb/cineldi/research/microgrids/
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