Thesis (PH.D.) - Cairo University - Faculty Of Engineering - Department Of Electrical Power and Machines

This dissertation deals with the automatic control problem of wind Energy Conversion SystemOur work is divided into three main sectionsThe first section in this dissertation is focused generally in wind energy conversion systemA literature review is presentedThis survey highlights the most common and important WECS control objectivesThe control regimes used to achieve these control objectives are introduced and compared in terms of control variable and output controlled variableThe second section in this dissertation is focused generally on the automatic control principlesThe problem of a certain class of robust fuzzy control system over linear matrix inequalities is studiedA complete robust stability condition for fuzzy observer based H? control to guarantee not only the stability of general T - S fuzzy systems but also the stability of the original nonlinear model by taking into account both type of fuzzy uncertainty (premise and consequent uncertainty) is developedWe develop and Drive a sufficient stability condition for the problem of fuzzy based mixed H2 / H? control for model following application in nonlinear dynamic systemThe third section mixes the above mentioned two sections and focused on the control problem of WECS via applying the most recent control technology discussed in the second section on the WECS discussed in first sectionIn this section , four different fuzzy model based controller designs for controlling WECS are studiedFuzzy state and output feedback control for WECS is appliedFuzzy pole cluster and H? fuzzy control for WECS are also appliedAll the control design in the four cases is formulated in terms of BMI feasibility problem which in turns transformed into LMI feasibility problemLMI lab and Yalmip under MatLab environment are used in solving these problems

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