Extended power transmission module-based virtual synchronous machine capable of resisting grid-side frequency fluctuation

The invention discloses an extended power transmission module-based virtual synchronous machine capable of resisting grid-side frequency fluctuation. The extended power transmission module-based virtual synchronous machine comprises an instantaneous power calculation module, an active power control module, a reactive power control module, a voltage generation module and an extended power transmission module, the voltage generation module is used for determining the reference value of the output voltage of the virtual synchronous machine according to the reference value of the phase angle of the output voltage of the virtual synchronous machine and the reference value of the amplitude of the output voltage of the virtual synchronous machine; and the expansion power transmission module accesses the output current of the virtual synchronous machine and is used for correcting the output voltage of the virtual synchronous machine so as to improve the damping characteristic of the virtual synchronous machine to the