The stability and reliability of microgrid working in island mode require each power generation unit to share the load equally and the power quality requires system voltage and frequency fluctuations within a certain range.The voltage and frequency fluctuation of microgrid with traditional droop control are affected by load

the output characteristic of source is related to such factors as transmission impedance and above requirement cannot be met.In this paper

the equal power distribution condition is analyzed

the virtual impedance is used to realize power decoupling and reasonable distribution of reactive power.Regarding bus voltage droop due to virtual impedance and droop control

an improved droop control method is proposed.The calculation bus voltage is introduced to redesign the reactive power droop equation so to reduce the influence of load variation and virtual impedance on the bus voltage

assure the fluctuation within the specified range and improve power quality of the microgrid.