The Virtual Resistor Used in Droop Control of DC Microgrids is a Series Loss-Free Resistor (SLFR)
DOI:
https://doi.org/10.18618/REP.2023.3.0022Abstract
The recently introduced series loss-free resistor (SLFR) is used to obtain the non-linear differential equations that describe the dynamic response of a DC-DC converter with virtual resistor and input LC filter, employed in the voltage droop control of DC microgrids. The equilibrium point and the stability criteria of the converter are presented. The results of the theoretical analysis are validated via computer simulation of largeamplitude transients for step change of the input voltage, the output current and the voltage reference signal. It is shown that the energy absorbed by the virtual resistor is not converted into heat but returned to the input stage by a power source. Thus, the paradox of the virtual resistor, which causes a voltage drop but does not consume power, is resolved. This is a theoretical study.
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