With the large-scale access of new energy such as wind power to the grid

the inertia of the power system is reduced

the frequency modulation ability is reduced

and the dynamic performance of the phase-locked loop under the weak current network is deteriorated. The effectiveness of the low-voltage ride-through control strategy of the permanent magnet direct-driven wind turbine based on the phase-locked loop grid-connected is greatly reduced. Therefore

a low-voltage ride-through control strategy of the permanent magnet direct-driven wind turbine based on the DC capacitor voltage self-synchronization control is proposed. Firstly

the control strategy introduces the DC capacitor voltage self-synchronization control unit into the unit control

so that the wind turbine does not need to rely on the traditional phase-locked loop structure for grid connection; Secondly

the super-capacitor energy storage system is paralleled at the DC side of the unit to build an integrated wind storage system to achieve power balance and improve the control of the grid-side converter

provide reliable reactive support during the low voltage ride through of the wind turbine

and improve the low voltage ride through capability of the permanent magnet direct-driven wind turbine; Finally

the effectiveness of the control strategy is verified by MATLAB/Simulink simulation.