In recent years

decentralized wind farms are widely spread and accessed on a large scale

resulting in a weaker fault traversal capability of the regional distribution network; once a local fault occurs in the distribution network

the wind turbines will be off-grid due to the inability to respond to the sudden drop of the grid voltage quickly. To address this issue

a transient virtual admittance (TVA)-based fault voltage ride-through performance improvement method is proposed for grid-configured doubly fed induction generators (DFIGs) to enhance their fault ride-through capability. Firstly

to address the problem of oscillatory instability in the phase-locked loop under a weak grid

a Virtual Synchronous Rotor (VSR) is proposed to replace the traditional phase-locked loop

thereby improving the DFIG grid framing. Secondly

to address the problem of insufficient fault ride-through capability

the TVA method is proposed to realize fault voltage transient compensation of the DFIG without a Crowbar

based on the vector control links of the rotor-side converter (RSC) and grid-side converter (GSC) in the traditional DFIG. Finally

the comparison experiments in the hardware-in-the-loop found that the TVA control strategy can meet the wind turbine (low-voltage ride through)LVRT requirements. Compared with the virtual impedance control strategy

the frequency variation during fault is reduced by about 22.94%

and at the same time

it can be restored to the original steady state within 2s after the fault.