A 225 kW Direct Driven PM Generator Adapted to a Vertical Axis Wind Turbine

Table 2

Control strategy.

Wind speed (m/s)	Rot. speed (rpm)	Control rule
0–4	0	Not operated
4–6.0	18	Speed regulation
6.0–10.9	18–33	Optimum eff. reg.
10.9–11.7	33	Stall regulation
11.7–25	28–33	Constant power reg.
>25	0	Shut down