  The virtual synchronous generator technology analogs the characteristics of
the synchronous generator via the controller design. It improved the stability
of the grid systems which include the new energy. At the same time, according
to the adjustable characteristics of the virtual synchronous generator
parameters, the parameter adaptive adjustment is used to improve the dynamic
performance of the system. However, the traditional virtual synchronous
generator adaptive control technology still has two drawbacks: on the one hand,
the large-scale adjustment of the damping droop coefficient and the virtual
moment of inertia requires the system having a high energy storage margin; On
the other hand, there is a power overshoot phenomenon in the transient
regulation process, which is disadvantageous to the power equipment. First,
this paper provides a convenient adjustment method for improving the transient
stability of the system, the system damping is adjusted by introducing the
output speed feedback. Second, according to the transient power-angle
characteristics of the system, a parameter adaptive control strategy is
proposed, which shortens the transient adjustment time and ensures that the
deviation of the system frequency in the transient adjustment process is within
the allowable range, and improves the transient performance of the grid
frequency adjustment, at the same time, the power overshoot is suppressed.
Finally, the experimental results show that the proposed control strategy is
superior to the existing adaptive control strategy.
