Abstract:The low voltage ride through (LVRT) capability of traditional doubly-fed induction generator (DFIG) is insufficient. To solve this problem, the coordinated reactive power control of energy storage type doubly-fed wind farm combined with static compensator (STATCOM) is proposed. The control is based on the original model of the DFIG, and connects the super capacitor in parallel to the DC side of the wind turbine via an isolated DC/DC converter. As a result, the control can absorb the unbalanced power generated on the DC side during the fault. In the event of a low voltage failure, according to the input of super capacitor, coordinated reactive power control performs on the converter on both sides and the STATCOM connected in parallel on the outlet bus of the wind turbine to support the grid voltage. At the same time, the super capacitor energy storage device adopts voltage and current double-closed-loop control, which can meet the requirements of system stability and economy. Simulation results show that the proposed control in the wind power grid-connected system can greatly improve LVRT capability of DFIG.