It is of great significance to improve the power supply reliability and power quality of the system under the condition of microgrid islands.The droop control characteristics of the micro-sources are analyzed in this paper.A multi-source parallel control system with no interconnect wire is set up.Varied micro-sources shall be controlled according to the P-f and the Q-U droop characteristic control

targeting at their active power and reactive power and making it possible for equilibrium in power within the microgrid.Small-signal method is used to build the mathematical model which is based on power inverter parallel system.The parameter of droop control is designed.Moreover

two microsources interconnecting microgrid simulation system with both the same capacity and varied capacity are established

and the feasibility of the droop control and the rationality of the droop parameter selection are verified.The droop characteristics is verified through single micro-source experiment

the real-time feedback data are calculated through theoretical analysis

compared with the experimental waveform display parameters

the correctness of the parameter design and the feasibility of the droop control strategy are demonstrated.