Wind Turbin Research Articles

Analysis and Geotechnical Design of Hybrid Foundation for Tall Wind Turbine

Abstract: The significance of wind turbines in meeting the expanding energy demand is critical. Taller towers should be employed to boost the power producing capability. The foundation must be efficient in order to securely carry the heavier loads of taller towers. When sustaining loads from superstructure are considered then bearing capacity of raft is taken into account for pile raft foundation. Piles help to strengthen the raft's bearing capacity while also regulating settlement in this arrangement, particularly differential settlement. A hybrid foundation, i.e. a pile raft foundation, is investigated and geotechnically designed here. The effectiveness of this system is demonstrated using the measures total settlement, differential settlement, and rotation. Keywords: Pile raft foundation, differential settlement, total settlement, wind turbin, bearing capacity

The Optimal Pitch Distance for Maximizing the Power Ratio for Savonius Turbine on Inline Configuration

Wind turbine array is an important factor to increase the feasibility of a wind turbine generation, especially for areas with low wind potential. Areas with low wind potential can use the VAWT model for harvesting the wind energy. VAWT array received less attention from researchers due to the low efficiency of the VAWT and also the difficulty in obtaining the optimal configuration of the turbine array. For smart grid system or urban application applications, VAWT still has a great opportunity to be used so that research on VAWT array needs to be studied. The in-line array of the wind turbine is less desirable due to the low power ratio of the wind turbin array, however the in-line array uses a smaller area so that it can be maximized on limited land. This study focuses on the in-line array of the Savonius turbine with four variations based on the pitch distance which refers to the turbine diameter (D). The variation in the distance between the first and second row turbines, 1D – 4D, shows a significant change in relation to the turbulence intensity in the middle area. Turbulence changes also affect the power ratio of the turbine array. The best average power ratio value obtained through mathematical modeling and experiment is obtained at a value of 34% with a average turbulence intensity at a value of 14% for 3D distance. This important finding can be used as a special reference for determining the distance between Savonius turbines in in-line arrays.

Analysis of near wake recovery scale model vawt hybrid wind turbin in wind tunnel

CFD simulations of full scale wind turbine have been carried out to predict recovery of wake that occur behind the hybrid VAWT turbine double, which states that recovery starts to occur in plane x/d = 4, verification of this result needs to be done. This study tested and measured the wind speed behind the scale model turbine in the wind tunnel. The purpose of this study was to create a prototype scale model of the VAWT hybrid, test it in the wind tunnel. Statistical methods will be used in this study to process data and determine the recovery position of wake from the VAWT double hybrid. The results show that wake recovery in wind tunnel experiment, in field x/d = 3 with 99%, compare with wake recovery occurs in simulation, shown a show the same trend, but need further investigation with similarity and Reynold number.

RANCANG BANGUN TURBIN ANGIN SAVONIUS 200 WATT

This study aimed to establish the type of Savonius wind turbines that capable of generating electric power of 200 Watts. This objective relates to Bantul District Government program which plans to build wind turbin generating electrical power (Pembangkit Listrik Tenaga Bayu, PLTB) 200 Watt as a backup power source for powering cooling fish caught by fishermen in the southern coast. Savonius Turbine chosen with consideration that it has simple construction so that the cost is not expensive, not depending on the direction of the wind, and is suitable for small power plants.Design of Savonius turbine blade has been completed, the turbine blade height 168 cm and a diameter of 55 cm. Blade turbine mounted on an arm along 55 cm from the turbine shaft and separate 120º. The turbine is supported by a 3-foot-tall turbines framework 2,5 m iron box 4 cm x 4 cm. The test simulated to determine the turbine rotation has been performed at varying wind speeds, i.e. 2 m /s, 4 m /s and 6 m /s.Based on test results, the turbine is capable of rotating an average of 54,2 rpm at a wind speed of 2 m /s; 86,8 rpm at a wind speed of 4 m /s; and 124,2 rpm at a wind speed of 6 m /s. These test results indicate that the Savonius turbines can be used to drive a generator producing the need of electrical energy

Improved time varying inertia weight PSO for solved economic load dispatch with subsidies and wind power effects

This article presents a new approach to economic load dispatch (ELD) problems by the considering the cost functions, impact renewable energy as wind turbin and subsidies. Economic dispatch is the short‐term determination of the optimal output of a number of electricity generation facilities, to meet the system load, at the lowest possible cost, subject to transmission and operational constraints. The main goal in the deregulated system is subsidies and analysis performance on government to minimize the total fuel cost while satisfying the load demand and operational constraints. The practical ELD problems have nonsmooth cost functions with equality and inequality constraints, which make the problem of finding the global optimum difficult when using any mathematical approaches. Accordingly, particle swarm optimization with time‐varying inertia weight (PSO‐TVIW) used for solving this problem. The effectiveness of the proposed strategy is applied over real‐world engineering problem and highly constrained. Obtained results indicate that PSO‐TVIW can successfully solve this problem. © 2014 Wiley Periodicals, Inc. Complexity 21: 40–49, 2016

Simple HAWT Prototype Efficiency at Small Scale Wind Speed

Nowadays, the wind energy research for alternatif anergy has been progress. Wind energy can be found if the wind turbine is available. Based on rotation axis, wind turbin has been classified to Horizontal Axis Wind Turbine (HAWT) and Vertical Axis Wind Turbine (VAWT). This paper explains simple HAWT prototype to 200 ohm resistor and LED at small scale wind speed. The blade material is acrilic. This material property is light, no easy broken, no corrosive and easy to find it. The blade model is flat plate section. Rotor diameter is 1 meter. The research was did at the beach. Permanent magnet synchronous generator is used to change wind energy to electric energy. The result shows that the generator increase linearly with wind speed. Measured wind speed was 1.9 m/s to 3.9 m/s. Average efficiency of HAWT prototype was 6.2% at delta connected load and 3.7% at wye connected load.

Numerical Simulation of Free Surface‐Structure‐Interaction with Multi‐Regional Mesh Deformation

AbstractThe Fluid‐Structure‐Interactions (FSI) for technological constructions on sea are becoming nowadays very important in view of growing consumption of renewable energy sources. Exceptionally the offshore wind farms are exposed to extreme weather conditions due to breaking and non‐breaking wave loads. This work presents numerical Finite‐Volume‐Method (FVM) analysis of fluid and structure interactions with water waves impact on elastic solid structures. We develop a Free Surface‐Structure‐Interaction (FSSI) solver in OpenFAOM [1] with multi‐regional mesh deformation. A two dimensional numerical water impact model on a damping element prototype of an offshore wind turbin tower is investigated. (© 2011 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)