Effects of Wind Speed Variability on Operation Parameters of an Off-Grid Wind Turbine System

2014 ◽  
Vol 2014 (2) ◽  
pp. 47-55 ◽  
Author(s):  
Umar Muhammad ◽  
◽  
Sadik Umar ◽  
Muazu Musa ◽  
Muhammad Garba ◽  
...  
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Wind Turbine System ◽  
Operation Parameters

LQG Controller Design for Identified Wind Turbine Systems

2014 ◽  
Author(s):  
Young-Man Kim
Keyword(s):  
Power Generation ◽  
Wind Speed ◽  
Wind Turbine ◽  
Closed Loop ◽  
Controller Design ◽  
System Simulation ◽  
Full Range ◽  
Optimal Power ◽  
Wind Turbine System ◽  
Safety Reason

In this research, it is developed to design LQG controller for wind turbine systems which are identified with Predictor-Based System Identification (PBSID) technique. The PBSID technique works well under closed-loop condition, which is useful for a system requiring closed-loop operation due to safety reason. First, a wind turbine system is identified using PBSID technique in full range of wind speed. Afterwards, using the identified system matrices, 1-DOF LQG controller is designed. The controller enables power generation to track the optimal power trajectory of a system. Simulation is used to demonstrate its usefulness.

Pitch angle control for grid-connected variable-speed wind turbine system using fuzzy logic: A comparative study

2016 ◽  
Vol 40 (6) ◽  
pp. 528-539 ◽  
Author(s):  
Mouna Ben Smida ◽  
Anis Sakly
Keyword(s):  
Fuzzy Logic ◽  
Wind Speed ◽  
Wind Turbine ◽  
Pitch Angle ◽  
Fuzzy Logic Controller ◽  
Proportional Integral ◽  
Wind Turbine System ◽  
Modeling Uncertainties ◽  
Integral Controller ◽  
Proportional Integral Controller

Pitch angle control is considered as a practical technique for power regulation above the rated wind speed. As conventional pitch control commonly the proportional–integral controller is used. However, the proportional–integral type may well not have suitable performance if the controlled system contains nonlinearities as the wind turbine system or the desired wind trajectory varied with higher frequency. In the presence of modeling uncertainties, the necessity of methods presenting controllers with appropriate performance as the advanced control strategies is inevitable. The pitch angle based on fuzzy logic is proposed in this work. We are interested to the development of a wind energy conversion system based on permanent magnet synchronous generator. The fuzzy logic controller is effective to compensate the nonlinear characteristics of the pitch angle to the wind speed. The design of the proposed strategy and its comparison with a conventional proportional–integral controller are carried out. The proposed method effectiveness is verified using MATLAB simulation results.

scholarly journals Design of a MPPT controller for permanent magnet synchronous generator driven wind turbine

2020 ◽  
Vol 2 (4) ◽  
pp. 251-257
Author(s):  
Việt Anh Trương ◽  
Quang Minh Huỳnh ◽  
Hoài Thương Võ
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Synchronous Generator ◽  
Maximum Power ◽  
Maximum Power Point ◽  
Wind Turbine System ◽  
Mppt Controller ◽  
Power Point ◽  
Working Point

Wind and other renewable energies are more and more developed all over the world, especially in countries with high wind potential such as Vietnam, to replace fossil energy, which would be exhausted in the near future. One important characteristic of wind turbines is that at each different wind speed, there exists a working point, represented by the rotation speed and the mechanical power at the crankshaft of the wind turbine, at which the maximum mechanical power is obtained, called maximum power point (MPP). Therefore, when the wind speed changes, this working point must be changed to be able to extract the maximum power from the wind to improve the total efficiency of the wind turbine system. This, in a wind energy conversion system (WECS), is assigned to the maximum power point tracking (MPPT) controller. In this paper, a MPPT controller is proposed, based on an improved Perturb and Observe (P&O) algorithm, for wind turbines using permanent magnet synchronous generator (PMSG), to maximize energy without measuring the wind speed and power characteristics of the wind turbine. An experimental model is also designed and tested in laboratory conditions, in which two coefficients K1 and K2 are used in turn when the working point is far or close to the maximum power point. The experimental results show that the proposed MPPT controller allows the extraction of maximum power from wind turbines under variable wind speed without determining the wind speed and characteristics of the wind turbine system.

Static Strength Design of Small Wind Turbine Blade Using Finite Element Analysis and Testing

2015 ◽  
Author(s):  
Sandip Kale ◽  
Jagadeesh Hugar
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Mechanical Energy ◽  
Wind Turbine Blade ◽  
Small Wind Turbine ◽  
Satisfactory Performance ◽  
Wind Turbine System ◽  
Low Weight ◽  
Large Wind

Today, wind power has become the most accepted renewable energy source and contributing major share in renewable energy market. Large wind turbines are now producing power effectively and delivering satisfactory performance to satisfy researchers, scientists, investors and governments. Large wind turbine technology has achieved respectable position across the globe. In addition to large wind turbine technology, it is observed that small wind technology has started movement toward a satisfactory growth. A considerable growth is forecasted by many experts in coming decades. The small wind turbine technology can be accepted by market if industry will provide small wind turbines with good desirable characteristics. Self starting behavior at a low wind speed, affordable compatible cost, maintenance free wind turbine system, low weight, reliable and satisfactory performance in low wind will always receive significant attraction of people for various applications. Low weight tower-top system and hence supporting structure, light weight and efficient generator, rotor’s ability to efficient wind to mechanical energy conversion and components manufacturing simplicity are also always expected by wind turbine users. This work is one of the attempts to design and develop a blade for small wind turbine in the line of objectives stated. Wind turbine blade is most important element in wind turbine system which converts wind energy in to mechanical energy. In addition to efficient aerodynamic blade design its strength design is also important so that it can withstand against various loads acting on it. Wind turbine blades strength has been analyzed by different researchers by conducting their static and fatigue testing. The objective of present work is to perform static strength test for newly developed blade of 1.5 m length. This newly developed blade consists of two new airfoils. A thick airfoil is used at the root and thin airfoil is used for remaining sections. The different loads acting on the blade are calculated using Blade Element Momentum theory at survival wind speed. It is decided to manufacture this blade using glass fiber reinforced plastic. The properties of material combination used are determined as per ASTM norms. The computational strength analysis is carried out using ANSYS. During this analysis blade is considered as a cantilever beam and equivalent load is applied. The blade is also tested experimentally using strain gauges. From both result analyses, it is found that developed blade is capable to take various loads acting on wind turbine blade at survival wind speed.

scholarly journals DESIGN OF WIND TURBINE SYSTEM INTEGRATED WITH BATTERY ENERGY STORAGE SYSTEM

2019 ◽  
Vol 1 (02) ◽  
pp. 72-82
Author(s):  
Güngör BAL ◽  
Süleyman Emre EYİMAYA
Keyword(s):  
Energy Storage ◽  
Wind Speed ◽  
Power Systems ◽  
Wind Turbine ◽  
Storage System ◽  
Energy Storage System ◽  
Load Demand ◽  
Wind Turbine System ◽  
Higher Power ◽  
Battery Energy

Due to uncontrolled natural variables such as wind speed, the correlation between the renewable energy production and the demand is strenuous. In order to make the renewable enrgy system effective the energy storage systems are utilized employing the, control systems for the enegy in the battery and power. In addition, the rapidly changing wind speed, particularly in wind turbines, causes variations in the power obtained from wind causing instability at a higher power levels. The system engaged in storing energy is employed to reduce fluctuations in power and to maintain stability of power systems. In this study, a wind turbine system integrated with energy storage system was created. This system is modeled and tested in MATLAB / Simulink. The results obtained evinces that the proposed system reduces power fluctuations and succeeds in meeting load demand.

Double Fed Induction Generator Control for Wind Power Generation

2020 ◽  
pp. 144-157
Author(s):  
Sumer Chand Prasad
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Wind Turbines ◽  
System Stability ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Variable Speed ◽  
Wind Turbine System ◽  
Speed Fluctuation ◽  
Doubly Fed

Doubly-fed induction generator wind turbines are largely developed due to their variable speed feature. The response of wind turbines to grid disturbance is an important issue, especially since the rated power of the wind turbine is increased; therefore, it is important to study the effect of grid disturbances on the wind turbine. In the chapter, the characteristics of the doubly-fed induction generator during wind speed fluctuation are studied. MATLAB/Simulink software has been used to observe the characteristics of wind turbines during wind speed fluctuation. Simulation results of the doubly-fed induction generator wind turbine system show improved system stability during wind speed variation. Power electronics converters used in the DFIG system are the most sensitive parts of the variable speed wind turbines with regards to system disturbances. To protect from excessive current, the DFIG system is equipped with an over-current and DC voltage overload protection system that trips the system under abnormal conditions.

Review on Energy Enhancement Techniques of Wind Turbine System

2021 ◽  
Vol 106 ◽  
pp. 121-130
Author(s):  
K. Ramesh Kumar ◽  
M. Selvaraj
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Life Cycle Cost ◽  
Incident Angle ◽  
Energy Resource ◽  
Separation Distance ◽  
Turbine Plant ◽  
Wind Turbine System ◽  
Investment Cost

Wind energy is the quickest growing sustainable energy resource in present energy crisis scenario. It has been considered as one of the most viable sources of environmental friendly energy. Starting investment cost of the wind turbine plant is exorbitant. Moreover, production cost of the wind turbine blade is about 20% of the wind turbine plant cost. It is fundamental to decrease the life-cycle cost of wind turbine plant by efficient utilization available wind speed. Optimized diffuser (Convergent divergent type and Convergent type) has been developed with highest possible pressure difference between inlet and exit of shroud, Area Ratio of inlet to exit section, wall length, incident angle and various flow qualities to enhance the available wind velocity considerably. The suitable tiny riblets on external layer of turbine blade have been introduced to lessen the skin friction drag force. Moreover, dual rotor blade with various rotor sizes for primary and secondary rotor, direction of rotor rotation, separation distance between them has been studied to augment wind turbine power generation and improvement in cut-in-speed. Moreover, comparative study will be conducted with standard (bare) wind turbine. Based on the above features, available wind speed increased significantly. In addition, various experiments and CFD analysis work still to be done to assess Diffuser based Wind Turbine model which is much closer to realistic product with available interaction. Due to the above additional features of the turbine system, the utilization of wind speed gets augmented with greater power production.

scholarly journals Evaluation of Energy in Wind Turbine System Using Probability Distribution

2018 ◽  
Vol 9 (2) ◽  
pp. 294
Author(s):  
Kalyan Sagar Kadali ◽  
L Rajaji
Keyword(s):  
Distribution Function ◽  
Wind Speed ◽  
Probability Distribution ◽  
Wind Turbine ◽  
Torque Control ◽  
Energy Output ◽  
Power Coefficient ◽  
Speed Ratio ◽  
Wind Turbine System ◽  
Mean Wind Speed

In this work, annual energy output of a variable speed wind turbine is analyzed using annual Weibull wind speed probability distribution function. The power coefficient variety with tip speed proportion in torque control district and pitch point variety for most extreme power yield from wind turbine are examined for distinguishing control framework parameters. The wind turbine power output and variation of power coefficient with tip speed ratio as well as pitch angle are examined / reported using annual Wei bull distribution function. Finally the variation of the estimated annual energy output of the given wind turbine with the mean wind speed is presented.

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