Abstract
This paper describes the design and implementation of a nonlinear control strategy for the control of the shaft speed of wind turbine systems. The proposed approach is based on input-output linearization techniques. Because wind turbine systems are highly nonlinear, feedback linearization constitutes a suitable optimal control design for those systems. Further, Electromechanical systems in general are good candidates for nonlinear control applications because the nonlinearities, being modeled on the basis of physical principles, are often significant and exactly known. The underlying design objective is to endow the wind turbine with high performance dynamics while maximizing power extraction when the wind turbine operates in the partial load regime. In addition to fulfilling the aforementioned control objectives, our control design aims to reduce the complexity of the control scheme, saving thereby the computation time of the control algorithm, which is an improvement over previous work found in the technical literature. Application of the proposed approach to an induction generator based variable speed wind turbine has led to optimum operations and maximization of power extraction when the wind turbine operates in the partial load regime.
Highlights
Wind energy has been the fastest growing energy technology since the 1990, in terms of percentage of yearly growth of installed capacity per technology source [1]
According to 2012 half year report recently released by the Global Wind Energy Council, the global wind industry installed more than 16,000 MW of wind power capacity in the first six months of 2012, a 7% increase in global installed capacity
The growth of wind energy, has not been evenly distributed around the world, with the five leading countries, China, USA, Germany, Spain and India, representing together a total share of 74 % of the. This rapid growth in wind energy installations worldwide has led to a growing demand for better modeling and control of wind turbines
Summary
Wind energy has been the fastest growing energy technology since the 1990, in terms of percentage of yearly growth of installed capacity per technology source [1]. The growth of wind energy, has not been evenly distributed around the world, with the five leading countries, China, USA, Germany, Spain and India, representing together a total share of 74 % of the. This rapid growth in wind energy installations worldwide has led to a growing demand for better modeling and control of wind turbines. Fixed speed wind turbines are the pioneers of the wind turbine industry They are simple, reliable and use low cost electrical parts [4]. The doubly-fed induction generators are widely used in variable speed wind turbines due to their reliability, ruggedness and relatively low cost. Partial feedback linearization together with a proportional integral (PI) controller is used to regulate
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