Abstract: A no-load grid-connected voltage phase control method of the brushless doubly-fed induction

generator（BDFIG）based on the control winding flux was proposed，the control system structure block diagram was constructed according to the mathematical model and control strategy of BDFIG. The hardware circuit of the no-load grid connection experiment was designed，the voltage phase of BDFIG was controlled in real time. On this basis，the voltage amplitude，frequency，and phase of BDFIG was automatically adjusted，and BDFIG could automatically connect to the grid when the grid connection conditions were met，which improves the rapidity and stability of the system during grid connection. The effectiveness of the proposed method was verified by the no-load grid-connected experimental results of BDFIG at different speeds.

      Key words: brushless doubly-fed induction generator（BDFIG）；control winding flux；no-load grid-connected；phase control