I note that virtual damping resistors and virtual impedances are usually considered to solve the problems that may arise due to the dependence of the conventional droop controller performances on the external line impedance e.g. Rocabert et al (2012)

https://www.researchgate.net/publication/254061229_Control_of_Power_Converters_in_AC_Microgrids

I would like to know in which microgrid scenarios a damping resistor (i.e a virtual impedance with resistive component only) could be more suitable than a virtual impedance.

If possible, kindly also recommend to me some paper where the sizing of said resistors/impedances is described in detail.

Thanks in advance!

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