Virtual synchronous generator (VSG) is a significant grid-forming converter grid-connection control method. However

VSG has the disadvantage of underdamping

causing frequency oscillations to occur when the inverter performs active regulation

which in turn leads to the power angle and voltage amplitude of grid-forming control to be affected. This paper proposes a novel damping improvement method driven by a hybrid of Incremental feedback observer (IFO) and Transient vector compensation (TVC) for this purpose. The IFO method uses the time-lag link to collect the small signal increments of power and power angle to crack the problem of VSG power angle underdamping; the TVC method introduces the transient feedforward in the voltage control loop to overcome the difficulty of voltage synchronization of the grid-forming VSG and the problem of slow response speed. The results of the hardware-in-the-loop platform operation show that

compared with the traditional VSG method

the hybrid IFO-TVC-driven grid-forming VSG control can reduce the overshooting of the active command response from 48% to 0.63%

and the system response time is reduced by 93.3%; the experiments on the line impedance change do not have significant frequency oscillations

and the system response time is decreased by 88.6%.