Abstract
In order to improve wind turbines grid connection stability, this paper proposes a novel control strategy for the hybrid system with a permanent magnet synchronous generator (PMSG) wind turbine and battery storage system. The control strategy contains three parts: machine-side converter (MSC) control, grid-side converter (GSC) control and battery converter control. MSC control achieves wind turbines maximum power point tracking (MPPT) algorithm, and GSC control is used to control the wind turbine output power, while the DC-link voltage is maintained by the battery DC-DC converter. In this way, the proposed control strategy could decouple the DC-link voltage and output power of the wind turbine. Therefore, the disturbance of DC-link voltage will not affect the normal operation of GSC, and then wind turbine grid connection stability can be improved. The time-domain modelling and simulations are carried out in MATLAB software and demonstrate that the proposed system can operate in the weak grid.
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