In this paper, dynamic modeling of a Vestas 660 kW wind turbine and its validation are performed based on operational data extracted from Eoun-Ebn-Ali wind farm in Tabriz, Iran. The operational data show that the turbine under study, with a classical PI controller, encounters high fluctuations when controlling the output power at its rated value. The turbine modeling is performed by deriving th...

The Output power of wind turbine is determined by wind speed. The Output power can be adjusted by controlling the generator speed and pitch angle of wind turbine. When the wind speed below the wind turbine rated, the output power of generator can be maximized by controlling the generator speed at point of maximum power coefficient. When the wind speed above the wind turbine rated, output power ...

The dynamic response of a two-rotor wind turbine mounted on spar-type floating platform is studied. compared against the baseline OC3 single-rotor design. Structural design shows how may lead to mass saving about 26% with respect an equivalent configuration. Simulations predict significant yaw — 6 deg standard deviation at rated operating speed. It shown directly caused by turbulence intensity ...

  Background: There are few studies comparing the biomechanical properties of angled blade plate and locking compression plates in supracondylar osteotomy. In the current randomized study, we prospectively compared the clinical and radiological outcomes of supracondylar osteotomy using these two plates. Methods: Forty patients with valgus knee malalignment were randomly assigned to two equal nu...

UAVs are designed to create lift in the same direction as rotation axis, hence propellers one of most basic components propulsion. Although several previous propeller optimization techniques have been developed, they usually find optimal thrust coefficient at a constant power and vice versa. This research will combine values optimum lowest time. A Simple Blade Element Theory served foundation f...

This paper shows roll and pitch feedback control on a coaxial mini helicopter equipped with a center of gravity steering mechanism. The helicopter carries a minimal set of sensors to measure yaw rate, distance to ground and roll and pitch angle. While yaw rate and distance to ground control are already realized on the helicopter, roll and pitch control including the necessary signal filtering a...

A rotor that can realize individual blade pitch control was designed. This paper focuses on finding the trend of helicopter vibration loads after applying multiple high-order harmonic control. The Glauert inflow model introduced to calculate induced velocity blades in a disk plane, and Leishman Beddoes (L-B) unsteady dynamic employed aerodynamic forces each section blade. It found influence loa...

Aiming at the grid-connected problems of the double-fed induction generator (DFIG), this paper researches the control technology of the rotor excitation and the pitch angle and proposes a grid-connected DFIG joint optimization control strategy of the rotor excitation and the pitch angle based on the structure decentralized theory, and establishes the joint optimization model of the grid-connect...