Research On Microgrid Power Control Method Using Improved Virtual Impedance

The conventional droop scheme is the most applicable power regulation technique in microgrids mainly due to its features of operating with no communication requirements.A microgrid(MG)of a variety of loads distinguished by their effect in an electric network have been applied for testing their causes on voltage distortion and system instability when investing power sharing between parallel operated generators.The difference in line impedance between various as well as nature of loading condition effects the sharing of reactive.Hence,this study emphases on the power sharing challenges associated to the above-mentioned situations.This research describes an enhanced virtual impedance to deal with the weakness of the classic droop control technique in the AC microgrid.This scheme relays on voltage drop compensation strategy across different feeders amongst parallel distributed generation(DG)sources by the adaptive virtual impedance.The virtual negative resistance and inductance in the proposed method compensates the line resistance as well as create inductive power decoupling which provide the accurate power distribution amongst parallel inverters.The Secondary control along with Proportional integral resonance(PIR)and adaptive virtual impedance-based compensation is proposed enhance reactive power sharing to support effective power sharing in different loading conditions.Furthermore,a restoration scheme is integrated in the control model for voltage magnitude and frequency restoration resulted by load variations.The findings show that the suggested control scheme achieved an efficient sharing of both reactive and real power which is balanced and stable.This was demonstrated in the MATLAB/Simulink simulation confirming that the suggested technique is feasible also more effective than the conventional droop control technique.