Control Scheme to Improve Reactive Power Sharing and Voltage Regulation in an Islanded Microgrid

The conventional droop control technique is popularly used in islanded AC microgrids to enable parallel operation of Voltage Source Inverters (VSI). The active and reactive powers will be accurately shared between the VSIs when the feeder impedances are equal. There will be significant error in reactive power sharing when the feeder impedances are unequal. A self adjusting Q - V droop control strategy available in the literature has analysed the system with ideal dc sources at the dc link of VSI. However, this paper has analysed the effect of PV arrays at the input side of VSI. A simulation model is developed in MATLAB/Simulink and different case studies: the effect of local load, non-linear load, variation in solar irradiation are conducted.