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Modeling and performance prediction of permanent magnet generator (PMG) in healthy and faulty cases are necessary for fault diagnosis of the machine. Application of the PMG for wind energy conversion is reviewed in this paper. Importance of fault diagnosis particularly eccentricity fault is emphasized. Typical eccentricity faults in practice and importance of experimental results for fault index validation...
The main advantage of the doubly fed induction generators (DFIG) over the synchronous generators is the small size converter which is located in the rotor circuit. However, this advantage can cause a problem during grid faults, because the over voltages and currents that will occur on the rotor circuit can damage the rotor side converter (RSC), if it is not over-dimensioned or protected for such high...
A robust control approach depending on delay is designed for the pitch-controlled variable-speed wind energy conversion system (WECS) above the rated wind speed range under the impact of time-delays. H∞ performance index is adopted to test the effect of the disturbance on the controlled output. A state feedback controller with time delay is designed such that the wind output power can be maintained...
This paper presents a 2D finite element analysis of a counter-rotating permanent magnet wind generator. The studied device is a two in one electrical machine used for counter-rotating dual rotor wind turbines used to convert the wind energy into electricity. The purpose of this study is to design the machine and to estimate its behaviour using the finite element based software package Flux ®.
Because the environment that the wind turbine runs in is severe, the generating efficiency is low and the vibration of tower is very obvious. The consequence not only causes economic loss but also lead to the reduction of the wind turbine's lifetime. Basing on the traditional PI controlling system, this passage mainly studies to decrease the vibration of the tower by adjusting the controlling PI parameters...
In recent years, wind power has been developing rapidly. As the wind power penetration from large scale wind turbines has been increasing rapidly in the transmission system, there is a higher requirement for the frequency stability and power generation efficiency of the wind power generation system, and the power grid puts forward higher continuous operation requirements for the grid connected wind...
The following article shows the implementation of MPPT's using fuzzy logic and a conventional algorithm known as P&O, both are applied to a low power wind turbine and the performance of each one is compared. Firstly, a model of the wind speed must be made, as it directly affects the system, therefore the extraction of the maximum power. Secondly, a model of the wind turbine, which is divided into...
In this article, the impact of different wind blade technologies on the levelized cost of energy of an offshore wind turbine is investigated. Blade technologies differ in material and fabrication processes, and this results in variations of the blade mass and cost. According to the blade technology, the blade mass can be characterized by an analytical function of the blade length. Results show a clear...
Wind turbines are often sited together in wind farms as it is economically advantageous. However, the wake inevitably created by every turbine will lead to a time-varying interaction between the individual turbines. Common practice in industry has been to control turbines individually and ignore this interaction while optimizing the power and loads of the individual turbines. However, turbines that...
Small-scale vertical axis wind turbines (VAWTs) are attractive for portable power generation. Controller performance is very important in rapidly varying gusty winds commonly observed in urban and rural areas. In this paper, a hill-climb searching (HSC) maximum power point tracking (MPPT), an energy-maximizing model predictive control (MPC) and a simple nonlinear control (SNC) as an MPC surrogate...
In this paper, we propose a vector control of a doubly fed induction generator (DFIG) for variable speed wind power generation. The model is developed based on the dual powered generator for the control of the active and reactive powers. Several studies are carried out to test their operation under different wind conditions. The results have shown good performances of the wind energy converter system...
This paper presents a control strategy for small wind turbines (WTs) to enhance their dynamic support capability in microgrids (MGs). For this purpose, the paper analyses two operation cases, namely the normal mode associated with the conventional control based on maximizing the power production, and a deloading mode where the WT operates under the maximum available power. The aim is to maintain a...
This paper considers Dual Stator Spoke Array Vernier Permanent Magnet (DSSA-VPM) generator for the direct drive wind-electric energy conversion. The structure of the generator is described. Although how this design is optimized is not discussed, dimensions of the designed generator are given. In electrical machine design thermal performance is naturally of utmost importance. In this paper thermal...
This paper addresses system identification and control for the wind turbine operating in region 3, where the wind is excessive and blades must pitch to regulate the rotor speed and alleviate the bending moments on the blades. This region is critical for safe operation of the wind turbine. First, this paper develops linear models for controller design of the individual and collective pitch control...
This paper deals with the model-based nonlinear control design for wind turbines in the full load region using Takagi-Sugeno techniques. The generator torque of the wind turbine is considered as a varying parameter of the system, which is adjusted by an external operator. This enables the possibility to provide ancillary services. The highly nonlinear behavior of the wind turbine is handled by the...
We transform the NREL (National Renewable Energy Laboratory) 5-MW geared equipped monopile wind turbine model into a hydrostatic wind turbine (HWT) by replacing its drivetrain with a hydrostatic transmission (HST) drivetrain. Here we focus on the design of blade pitch controller for the HWT using a linear parameter varying (LPV) control algorithm. To enhance performances of the pitch control system...
Wind energy has many advantages, because it does not pollute and is an inexhaustible source of energy. The Double Fed Induction Generator (DFIG) is one of the most important electric generator used for Horizontal Axis Wind Turbine (HAWT). In this paper, a Discrete-time Neural Input-Output Feedback Linearization Control (N-IOFLC) for DFIG is proposed to force the rotor currents to track specified reference...
In this paper, wind generator modeling is presented including the algorithm for maximizing the extracted power. The DFIG stator winding is directly connected to the utility grid and the rotor winding is connected via a back to back converter. The oriented flux control allows the machine to follow the set points of active and reactive power.
Recent trends in wind turbine design have demonstrated that decreased levelized cost of energy (LCOE) can be achieved by increasing rotor size and therefore the amount of energy a wind turbine can capture. However, as rotor radii increase into extreme scales, it is likely that the increased mass required to maintain the necessary structural strength for three-bladed upwind turbines will drive up costs...
Control of aerodynamic loads is a crucial issue in keeping wind energy economically competitive with traditional energy sources. This paper continues the investigation of the use of Iterative Learning Control (ILC) for load control in wind turbines with smart devices on rotor blades. A relatively simple computational fluid dynamics model is used to simulate the flow past an airfoil. Assuming no actuator...
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