A variable-speed, constant-pitch wind turbine was investigated to evaluate the feasibility of constraining its rotor speed and power output without the benefit of active aerodynamic control devices. A strategy was postulated to control rotational speed by specifying the demanded generator torque. By controlling rotor speed in relation to wind speed, the aerodynamic power extracted by the blades from the wind was manipulated. Specifically, the blades were caused to stall in high winds. In low and moderate winds, the demanded generator torque and the resulting rotor speed were controlled to cause the wind turbine to operate near maximum efficiency. A computational model was developed, and simulations were conducted of operation in high turbulent winds. Results indicated that rotor speed and power output were well regulated.
[1]
N. Kelley.
Full vector (3-D) inflow simulation in natural and wind farm environments using an expanded version of the SNLWIND (Veers) turbulence code
,
1992
.
[2]
A D Wright,et al.
Analysis of a two-bladed, teetering-hub turbine using the ADAMS{reg_sign} software
,
1994
.
[3]
C. P. Butterfield,et al.
Variable speed operation of generators with rotor-speed feedback in wind power applications
,
1995
.
[4]
Eduard Muljadi,et al.
Effects of turbulence on power generation for variable-speed wind turbines
,
1997
.
[5]
Eduard Muljadi,et al.
A conservative control strategy for variable-speed stall-regulated wind turbines
,
2000
.