This paper set out to establish the dynamics model of shaft torsional vibration for direct-drive wind turbine with phenomenon unstable system vibration. The stability equilibrium point dynamical is investigated, and Routh–Hurwitz criterion used obtain a range values bifurcation control parameters. For stable point, domain calculated by constructing Lyapunov function. sensitivity analysis parame...

A wind turbine is a conversion mechanism that converts energy into electrical energy, but the efficiency cannot reach 100%, so there partial loss. These losses are converted thermal which in turn causes to heat up and affect generator performance. Therefore, cooling temperature field analysis of turbines very important. In this paper, an electromagnetic model established by using parameters 4 M...

This research note deals with grid fault-tolerance of a doubly-fed induction generatorbased wind turbine using high-order sliding mode control. Indeed, it is proposed to assess the main and attractive features of high-order sliding modes which are robustness against external disturbances (e.g. grid) and chattering-free behavior (no extra mechanical stress on the drive train). Simulations using ...

Space Vector Modulation (SVM) based Direct Torque Control (DTC) scheme is used for a variable –speed direct drive Permanent Magnet Synchronous Generator (PMSG) in a wind power generation system. SVM Provides more flexibility for inverter voltage utilization, in order to compensate the torque and flux errors in a smoother way than conventional DTC. SVM based DTC maintains constant switching freq...

Lateral tower vibrations of offshore wind turbines are normally lightly damped, and large amplitude vibrations induced by wind and wave loads in this direction may significantly shorten the fatigue life of the tower. This paper proposes the modeling and control of lateral tower vibrations in offshore wind turbines using active generator torque. To implement the active control algorithm, both th...

This paper proposes a novel optimal current given (OCG) maximum power point tracking (MPPT) control strategy based on the theory of power feedback and hill climb searching (HCS) for a permanent magnet direct drive wind energy conversion system (WECS). The presented strategy not only has the advantages of not needing the wind speed and wind turbine characteristics of the traditional HCS method, ...

Wind energy, a kind of non-conventional energy source and environmental fresh energy, is widely studied nowadays. Directly driven wind turbine permanent magnet synchronous generator (D-PMSG) plays a vital role in the latest small-scale wind Power technology. This paper presents the modeling and simulation of a 12kW direct driven Permanent Magnet Synchronous Generator of Wind Power. This model c...

With appropriate vibration modeling and analysis the incipient failure of key components such as the tower, drive train and rotor of a large wind turbine can be detected. In this paper, the Nonlinear State Estimation Technique (NSET) has been applied to model turbine tower vibration to good effect, providing an understanding of the tower vibration dynamic characteristics and the main factors in...