The turbine control purpose is to achieve the maximum limit of wind power,
associated with reducing the mechanical loads. The current control techniques do not take
into consideration the dynamical side of wind and turbine, which leads to power los
s. To
improve the effectiveness of the
nonlinear controllers, we can derive the nonlinear feedback controllers for static and
dynamic conditions in order to reach the wind speed estimator. Then we can test the
controllers by a mathematical model applied on the wind turbine simulator, with
disturbances and noise. The results have shown important improvements in comparison
with the current used controllers.
As a result of the development of the use of reinforced Composites with fibers in
practical applications continuously, research aims to study the effect of proportion piroxide
additives to unsaturated polyester resin on the tensile properties of th
e samples prepared
from unsaturated polyester resin reinforced with glass fiber used in wind turbine blades
manufacturing, and also studying the effect of for the application of heat treatment
operations on the hardening of the unsaturated polyester and tensile properties after heat
treatment process the application in order to improve the properties of these blades.
Test samples were prepared containing ratios (1% - 1.5% - 2%) of methyl Etel
ketone piroxide MEKP and test results showed that the best ratio at 1.5%. While the heat
treatment results showed that the best values for tensile strength at break of the samples are
treated to a time of / 48 hours /.
In this research, a study of solution to the problems of transmission in
wind turbines, where the electronic appliances and gearboxes
components responsible for much of the wind turbine problems as they
increase the cost of operation and maintenan
ce of wind turbines and
here comes the role of variable transport systems ratios, which is a
solution more efficient than in fixed proportions regimes where create
a dynamic model of the turbine wind using the aerodynamic properties
of the blade wind and calculate torque when the wind changing speeds
values and this for each of the wind turbine with proportions variable
order and fixed ratio using MATLAB software and after study shows
that energy production is slightly higher and more importantly, so it is
possible to say that the CVT system is a candidate to be the subject of
research for future developments of the technology of wind turbines.
This study treat the effect of the Suction method as a way of the
boundary layer controlling in order to avoid or at least delay the
boundary layer separation and to explain the effectiveness of this
method in improving the aerodynamic performance
of the
Airfoils of the studied wind turbine blade and thus the possibility
of obtaining better electrical output of the wind turbine, that is
performance improving of wind turbines and obtains a better
design.
This paper presents a new contribution the domain of sensorless speed control of
doubly-fed induction generator in wind turbine applications. Where the speed and the
dynamic torque are estimated and used to feedback the control loops. The proposed
sensorless algorithm is robust to variations of the values of machine parameters where the
estimated speed is independent of them. The algorithm avoids using differentiation which
significantly improves its immunity to noise. The field oriented vector control theory is
used to control the speed of the doubly fed induction machine. The used controllers in
closed loops are classical proportional integral (PI). The modeling is based on the Park
equations of the induction machine and on a simple model of the three phase inverter. The
results of simulink on MATLAB provide good performance of the sensorless speed
control.
