In recent years

with the rapid development of microgrid and distributed generation technology

the virtual synchronous generator(VSG)has been proposed which is adaptive to microgrid interface converter for low inertia and small damping. Based on the droop control

VSG further simulates the rotational inertia and damping coefficient of synchronous generator. Compared to the droop control

the response of VSG has been further improved

but the dynamic adjustment performance of frequency and power cannot be guaranteed in the same time. Aiming at this problem

the output frequency of island condition and output power of grid condition are controlled by self-adaptive control. Firstly

the root locus of active power is made under different rotational inertia and damping coefficient

combining with the rotor mechanical equation

the effects of the inertia and damping coefficient on the system are analyzed. Secondly

in order to realize the self-adaptive control of VSG

the self-adaptive equation of the inertia and damping coefficient are established. Finally

self-adaptive control model of VSG whose capacity is 20 kW in MALAB/Simulink and VSG experimental platform are built. The simulation and experimental results verify the efficiency and accuracy of proposed control strategy.