Single Wind Turbine Power Generation Systems

Small wind turbine power generation systems have the potential to meet the electricity demand of the residential sector in developing countries. However, due to their exposure to low Reynolds number (Re) flow conditions and associated problems, specific airfoils are required for the design of their blades. In this research, XFOIL was used to develop and test three high performance airfoils (EYO7-8, EYO8-8, and EYO9-8) for small wind turbine application. The airfoils were subsequently used in conjunction with Blade Element Momentum Theory to develop and test 3-bladed 6 m diameter wind turbine rotors. The aerodynamic performance parameters of the airfoils tested were lift, drag, lift-to-drag ratio, and stall angle. At Re=300,000, EYO7-8, EYO8-8, and EYO9-8 had maximum lift-to-drag ratios of 134, 131, and 127, respectively, and maximum lift coefficients of 1.77, 1.81, and 1.81, respectively. The stall angles were 12° for EYO7-8, 14° for EYO8-8, and 15° for EYO9-8. Together, the new airfoils compared favourably with other existing low Re airfoils and are suitable for the design of small wind turbine blades. Analysis of the results showed that the performance improvement of the EYO-Series airfoils is as a result of the design optimization that employed an optimal thickness-to-camber ratio (t/c) in the range of 0.85–1.50. Preliminary wind turbine rotor analysis also showed that the EYO7-8, EYO8-8, and EYO9-8 rotors had maximum power coefficients of 0.371, 0.366, and 0.358, respectively.

Download Full-text

A Design of Standalone Hybrid PV/Wind/Fuel cell Generation System and Hydrogen Electrolyzer With Local Controller for Remote Areas

JAREE (Journal on Advanced Research in Electrical Engineering) ◽

10.12962/j25796216.v3.i2.101 ◽

2019 ◽

Vol 3 (2) ◽

Author(s):

Soedibyo Soedibyo

Keyword(s):

Power Generation ◽

Fuel Cell ◽

Wind Turbine ◽

Generation System ◽

Remote Areas ◽

Renewable Power ◽

Renewable Power Generation ◽

Local Controller ◽

Dc Bus ◽

Power Generation Systems

Integration of fuel cell and electrolyzer on DC bus is a promising alternative to solve voltage fluctuation and balance of power problems in a standalone hybrid renewable power generation systems. The hybrid renewable power generation systems consist of photovoltaic, wind turbine, fuel cell and hydrogen electrolyzer. Each the component integrated on DC bus through the converter DC – DC using local controller to supply the inverter which connected to the islanded load. Local controller in each part will make the system become flexible if there are additional generating units in the future. The local control methods used in this hybrid renewable power generation system is MPPT and constant voltage control. MPPT control applied to photovoltaic and wind turbine converters to maximize power generation from photovoltaic and wind turbine. Constant voltage controller applied to the fuel cell and electrolyzer converters to control the DC bus voltage alternately. This research is a new design system for remote areas by utilizing the potensial of renewable energy in the area. The result show the power quality and continuity of electricity services.

Download Full-text

Improvement in Solar Chimney Power Generation by Using a Diffuser Tower

Journal of Solar Energy Engineering ◽

10.1115/1.4029377 ◽

2015 ◽

Vol 137 (3) ◽

Cited By ~ 18

Author(s):

Shinsuke Okada ◽

Takanori Uchida ◽

Takashi Karasudani ◽

Yuji Ohya

Keyword(s):

Power Generation ◽

Wind Turbine ◽

Static Pressure ◽

Solar Chimney ◽

Generation Efficiency ◽

High Rise ◽

Pressure Region ◽

Computational Fluid Dynamics Cfd ◽

Inner Diameter ◽

Power Generation Systems

The solar chimney prototype, operated in Spain from 1982 to 1989, verified the concept of the solar chimney. The power generation mechanism in this system is to turn the wind turbine placed inside a high rise cylindrical hollow tower by an induced thermal updraft. As long as the thermal updraft is induced inside the tower by the solar radiation, this system can produce electricity. The disadvantage of this system is the low power generation efficiency compared to other solar energy power generation systems. To overcome this disadvantage, we improved the mechanism in order to augment the velocity of the air which flows into the wind turbine. By applying a diffuser tower instead of a cylindrical one, the efficiency of the systems power generation is increased. The mechanism that we investigated was the effect of the diffuser on the solar chimney structure. The inner diameter of the tower expands as the height increases so that the static pressure recovery effect of the diffuser causes a low static pressure region to form at the bottom of the tower. This effect induces greater airflow within the tower. The laboratory experiment, as does the computational fluid dynamics (CFD) analysis of the laboratory sized model, shows that the proposed diffuser type tower induces a velocity approximately 1.38–1.44 times greater than the conventional cylindrical type. The wind power generation output is proportional to the cube of the incoming wind velocity into the wind turbine; therefore, approximately 2.6–3.0 times greater power output can be expected from using the diffuser type tower.

Download Full-text

Key Technology of LCA on Small Wind Power Generation System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.571-572.925 ◽

2014 ◽

Vol 571-572 ◽

pp. 925-929

Author(s):

Qiu Yun Mo ◽

Shuai Shuai Li ◽

Fei Deng ◽

Liang Bao Tang ◽

Ke Yan Zhang

Keyword(s):

Power Generation ◽

Wind Turbine ◽

Wind Power ◽

Evaluation Model ◽

Wind Power Generation ◽

Geographical Information ◽

Generation System ◽

Agent Based ◽

Power Generation System ◽

Power Generation Systems

Many domestic and international scholars carried on LCA method research to wind power generation system, but generally focused on the large megawatt wind power generation system rather than SWPGS Small Wind Power Generation Systems (power rating less than 1kw).The different structural between large wind turbine and small wind turbine led to the different system boundaries and evaluation models in LCA. So this paper puts forward to establish LCA database based on Geographical Information System (GIS) and establish evaluation model based on Agent-based Modeling (ABM) method, which can provide references for LCA direction of the further deeper follow-up research.

Download Full-text