To improve the power quality

constant power loads（CPLs） in DC microgrids are usually connected to a DC bus by their own LC filters. However

the paralleling LC filters with weak damping and similar parameters can easily lead to LC parallel resonance

which in turn causes the instability of CPL input voltage. Therefore

from a small-signal impedance model of a DC microgrid

its reduction circuit under the oscillation frequency was deduced

the mechanism of LC parallel resonance（LCPR） was revealed

and the impacts of filter parameter heterogeneity on LCPR were analyzed. On this basis

a virtual RC control（VRCC） strategy

where a virtual RC current was added to the current loop of CPL converter

was proposed to restrain the LCPR

and its parameter configuration method was also introduced. Finally

both the influences of filter parameter heterogeneity and the effectiveness of VRCC were verified in MATLAB/Simulink. Simulation results show that the VRCC can be adopted to achieve the effect of shunt resistance and capacitance damping without adding extra system components. After taking the virtual resistance and capacitance as 1.38 ? and 480 μF with the proposed control parameter configuration method

the VRCC can quickly suppress LCPR within 0.2 s.