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The results from [1] and [2] are combined and extended to speed funnel control with simplified disturbance observer for wind turbine systems (WTS) with elastic shaft where active damping is necessary but only generator-side speed measurement is available. It is shown that (i) WTS with elastic shaft and disturbance observer have relative degree one, bounded-input bounded-output (BIBO) stable zero-dynamics...
The aim of this paper is to present a piecewise-linear Hammerstein Wiener model for the identification of variable speed Wind Energy Conversion System driven by Doubly Fed Induction Generator (DFIG). The subsystems of the wind energy conversion systems are identified individually using non linear system identification technique. The complete wind energy conversion system is modeled in matlab simulink...
This paper presents the analyzed results of an integrated offshore wind farm (OWF) and seashore wave farm (WAF) connected to an onshore large power grid through a variable frequency transformer (VFT) to simultaneously achieve power-fluctuation mitigation and stability enhancement. The performance of the studied OWF is simulated by an equivalent aggregated 80-MW doubly-fed induction generator (DFIG)...
Most of the wind power systems are using induction generator (IG) for conversion of mechanical power available from wind turbine (WT) to electrical power. To investigate the dynamic response of the wind power system equipped with an IG, this work presents simulation study of an IG-based WT for various operating conditions. The simulation study has been performed on wind gusts, ramps, and noise components,...
An adaptive second order sliding mode control strategy is explored in this work, to maximize the energy extracted from the wind in a wind energy conversion system (WECS). It is required to such strategy to deal with the nonlinear nature of the WECS, the randomness of the wind speed, model uncertainties and external disturbances, and also with the need to reduce mechanical loads. The special features...
This paper presents a MPPT technique for high performance wind generator with induction machine based on the growing neural gas (GNG) network. Here a GNG network has been trained off-line to learn the turbine characteristic surface torque versus wind speed and machine speed, and implemented on-line to obtain the wind tangential speed on the basis of the estimated torque and measured machine speed...
This paper investigates the possibility to use a power split electric driven continuously variable transmission as the core of a wind energy conversion system. The proposed power split transmission for WECS, called W-CVT allows to control the speed of the turbine rotor by keeping constant the speed of the electric generator. The W-CVT is constituted by a planetary gear set integrated with a small...
The paper examines different control strategies for a VAWT drive. A technique is also proposed for a sensorless application allowing to maximize the output power up to the rated wind speed and to satisfy the mechanical and SPMG heating constraints in the higher wind speed range profiting, at the same time, by high wind speed periods. The results of the implementation of this strategy based on an equivalent...
The dynamic performance of wind turbines indicates that the power extracted from the wind is strongly related to the inertia of the system and characteristics of wind speed. In this paper, a simulation model of a wind turbine system has been developed to study the effects of inertia. Three aspects of the dynamic performance of wind turbines are investigated in the paper: the prediction of the trend...
Fuzzy PD controls strategy capturing maximum wind energy is presented according to the variable of wind. Fuzzy has been widely used because of its nonlinear and stability. However, when it comes to the stable region under capturing maximum wind energy, it becomes fluctuation and brings dangerous to grid. Improving stability and capturing maximum wind energy are the keys of research. Simulation results...
A novel maximum power point tracking (MPPT) strategy is presented in the paper. When wind speed varies, the wind turbine could obtain a big torque difference by adopting the novel strategy to achieve the aim of tracking the optimum turbine speed fleetly. The square wave permanent magnet synchronous generator (PMSG) is adopted in this paper for considering the characteristic of the diode rectifier-Boost...
Active control of a horizontal axis wind turbine via pitching of the rotor blades is considered in this paper. It presents a robust control design for a variable-speed adjustable-pitch wind energy conversion system with an uncertain model. A Hinfin controller is designed to drive the turbine speed to extract invariable power from the wind and to allow pitch adjustment to power regulation. It is the...
This paper presents a robust control design for a variable-speed adjustable-pitch wind turbine system. An adaptive decoupling controller is designed to drive the turbine speed to extract invariable power from the wind and to allow pitch adjustment to power regulation. An adaptive decoupling controller is designed to drive the turbine speed to extract maximum power from the wind and to allow pith adjustment...
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