A full-scale three-dimensional profile measurement system with an innovative optical setup for measuring the geometric shape of large wind-turbine blades in high accuracy is developed. A normal full-scale wind blade geometry measurement system can be very expensive. The presented system is low cost, but it can yield a high accuracy for geometric dimensions by error compensation from its measured data. It consists of a low cost long linear stage driven by a direct current motor with linear scale feedback for position and velocity control, and two line-scan optical heads mounted on opposite sides. The line image of the sectional shape profile can be captured by two charge-coupled devices. By scanning the optical head throughout the full length of the blade, the image of the whole profile can be collected. The shape parameters of the wind-turbine blades can thus be determined. A special effort has been employed to improve the straightness and positioning accuracy of the linear stage by error compensation. With system calibration of the stage and the cameras, experimental results show high accuracy of the developed system. This low-cost optical system is expected to measure any full-scale wind blade profile up to several meters in length.

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Abstract. In this work, the modeling of wind turbine systems applying Doubly Fed Induction Generator is proposed. The mathematical model and control are investigated by analyzing theory and simulating performed in LabVIEW environment. All of characteristic parameters as well as the power generation process can be observed easily on LabVIEW. Besides, a comparison of reference current responses on the rotor side converter using conventional PI, PID and fuzzy controllers is also realized in this paper. The results obtained from the system with the presented control technologies indicated that the fuzzy logic controller has current response faster with almost no steady-state error than the conventional PI and PID controllers. Keywords:The Human-machine interface, general model, vector control, fuzzy inference, active and reactive power, the center of area.

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