In AC micro grid system which is composed of photovoltaic

the inverter is connected to the large grid through the common connection point. The droop control is usually used to maintain the power balance and voltage stability of the photovoltaic power point and the voltage stability are achieved by reactive compensation. In the actual photovoltaic microgrid system

the excessive voltage regulation will cause the electrical equipment to be off the grid. In view of this problem

a kind of droop reactive compensation control scheme is proposed in this paper

specifically

the novel drop coefficient is introduced to increase the dynamic performance of reactive power compensation. The erros of reactive distribution is existed due to mismatching of impedance of transmission line. Aiming at this problem

a kind of virtual impedance is proposed in this paper to improve the accuracy of reactive power distribution. Specifically

the dynamic virtual impedance is used to improve the resistance characteristics of the system and compensate the voltage drop.It is proved by Matlab/Simulink simulation and experiment of the above strategy that the scheme proposed in this paper can effectively improve the control performance of PV microgrid.