Optimal Controller Design for Wind Turbine System Using Dynamic Programming
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Date
2019-10
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Addis Ababa University
Abstract
Now a days, many researchers are focusing on renewable energy sources due to the fact that
the cost of fuel is growing up in day to day activity and to decrease or limit environmental
effects.Wind energy is one of the fastest growing up energy source due to its cost effectiveness
and availability.
In this thesis, optimal controller is proposed to extract maximum wind energy from the available
wind speed. To extract wind energy, the very volatile nature of wind speed has made it difficult
the energy extraction process. Deterministic dynamic programing algorithm is chosen to design
optimal controller. This type of numerical programming algorithm is highly applicable for the nonlinear
model of
wind
turbine system
and
its
constraints.
The contribution of this thesis is that instead of standard torque control, optimal controller is
employed to globally optimize wind energy capture under variable wind condition in region
two(from cut-in to rated wind speed) operation of wind turbine system. The performance of this
control method is tested via MATLAB software. The outcomes of the system have 7 up to 8.5 tip
speed ratio optimal value and the aerodynamic efficiency has 0.411 conversion value. And also
the optimal controller captured 13.841% more energy than STC for the piecewise step input wind
speed. For the randomly generated wind speed pattern, the optimal controller captured 1.15%
more energy than the STC. The lower percentage improvement in this case is due to the limited
range of the wind speed value given for the simulation.
Description
Keywords
Optimal control, dynamic programming, optimization