A wind electrical generation system is the most cost effective of all the environmentally clean and safe renewable energy sources in the world. Due to the constant research in the field of wind energy related technologies and generic growth in power electronics system, wind power generation becomes simpler and more economical. Self-Excited Induction Generators(SEIG) have recently emerged for wind energy conversion in remote and rural areas due to many advantages as standalone induction generator over Grid Connected Induction Generators. However, poor voltage and frequency regulation under varying load and speed is the prime disadvantage of standalone SEIG. This thesis work presents a detailed d-q model of SEIG using MATLAB/Simulink which contributes to the development of SEIG modeling. From the generalized d-q model, the effect of different constraints such as, variation of wind speed, excitation capacitor size and different loads on the SEIG output voltage built up process have been addressed and analyzed. Annual wind speed distribution models for real wind speed and the effect of wind speed variation on the steady state generated voltage and the rotor speed studied. SEIG is based on the action of the three phase voltage source inverter (VSI) and DC bus capacitor voltage with the proposed controller. VSI with DC voltage can provide the active and reactive powers and regulate AC system bus voltage and the frequency. Two type of control are used to maintain the voltage and frequency at its rated value in case of variation in the load or in the wind speed. The first control is the reactive power control to adjust the terminal voltage at its rated value and the second control is the active power control to adjust the frequency at its rated value by changing the value of the pitch angle of the wind turbine blade. Simulation is done for stator terminal voltage and generator rotor speed under different conditions with (linear and nonlinear) loads and without loads. A comparison is done between VSI with proportional integral (PI) and VSI with fuzzy logic based PI controller for both linear and non-linear loads. The PI controller based voltage regulator has poor dynamic response and Fuzzy-PI Controller gives better performance for any load.


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    Title :

    FUZZY LOGIC BASED PROPORTIONAL INTEGRAL CONTROLLER FOR A SELF-EXCITED INDUCTION GENERATOR IN WIND ENERGY CONVERSION


    Contributors:

    Publication date :

    2019-06-11


    Remarks:

    doi:10.20372/nadre/3946



    Type of media :

    Theses


    Type of material :

    Electronic Resource


    Language :

    English



    Classification :

    DDC:    629