Control of power sharing in an island microgrid using virtual impedance

In this paper, a reactive power sharing strategy that uses droop controller combined with virtual impedance and estimating the voltage drop due to the line impedance to improve significantly improves the reactive power control and sharing accuracy. Because of, with a given minimum allowable voltage of system, the voltage droop slope cannot be made arbitrarily large, so this paper presents a better way to improve the reactive power control and sharing accuracy is to incorporate the line voltage drop effect into the power control. This can be realized by adding the coefficient slopes of the voltage into droop control, to estimate the voltage drop due to line impedance and effect of local loads. Finally, considering the different locations of loads in a multibus microgrid. The proposed reactive power cosharing strategy has been tested in simulation Matlab/Simulink.