Energy harvesting is currently a hot research topic, mainly as a consequence of the increasing attractiveness of computing and sensing solutions based on small, low-power distributed embedded ...systems. Harvesting may enable systems to operate in a deploy-and-forget mode, particularly when power grid is absent and the use of rechargeable batteries is unattractive due to their limited lifetime and maintenance requirements. This paper focuses on wind flow as an energy source feasible to meet the energy needs of a small autonomous embedded system. In particular the contribution is on the electrical converter and system integration. We characterize the micro-wind turbine, we define a detailed model of its behaviour, and then we focused on a highly efficient circuit to convert wind energy into electrical energy. The optimized design features an overall volume smaller than 64 cm³. The core of the harvester is a high efficiency buck-boost converter which performs an optimal power point tracking. Experimental results show that the wind generator boosts efficiency over a wide range of operating conditions.
This paper presents two electromechanical systems used for the overspeed protection of small wind turbines. The actuators have the purpose of rotating the back rudder (tail vane) of the wind turbine ...when the blades are overspeeding. The rudder rotation angle is 90 degrees in order to completely turn the wind turbine blades away from the wind flow direction. The first device is a new limited-angle torque electromechanical actuator consisting of a device with a simplified structure composed of four permanent magnets (two on each side) glued on a rotor mounted between two stator poles built from ordinary rectangular construction pipes and an electronic control unit. The second device is based on a regular stepper motor actuator with a reduction gear and an appropriate control scheme to maximize the energy harvested at high, over-nominal wind speeds. A generic comparison is provided for the proposed solutions.
The Mexican territory has a large potential for renewable energy development, such as geothermal, hydro, biofuels, wind and solar. Thus, a 2.5 kW hybrid power system (solar, wind and hydrogen) was ...designed and installed to meet the power demand for a stand-alone application at the University of Zacatecas. The hybrid unit integrates three power energy sources –a photovoltaic system (PV), a micro-wind turbine (WT), a prototype of a unitized regenerative fuel cell (URFC) and energy storage devices (batteries)– in addition to their interaction methodology. The main contribution of this work is the URFC integration to a hybrid power system for the production of H2 (water electrolyzer mode) and energy (fuel cell mode). These three energy technologies were connected in parallel, synchronized to the energy storage system and finally coupled to a power conversion module. To achieve the best performance and energy management, an energy management and control strategy was developed to the properly operation of the power plant. A meteorological station that has wireless sensors for the temperature, the humidity, the solar radiation and the wind speed provides the necessary information (in real time) to the monitor and control software, which computes and executes the short and mid–term decisions about the energy management and the data storage for future analysis.
► A 2.5 kW hybrid power system was designed and installed for a stand-alone application in Mexico. ► The hybrid unit integrates three power energy sources: a PV system a micro-WT and a URFC prototype. ► The main contribution is the URFC integration to a hybrid power system for H2 and energy productions. ► The URFC performs as an energy storage module (WE mode) and energy conversion device (FC mode). ► An energy management strategy was developed to the properly operation of the power plant.
The development of micro wind turbine is involving many aspect such as engineering technology and management aspect. Both of this approach is important while the priority would be different for each ...implementation. The study undertaken is to understand the issues during micro wind turbine implementation and found the priority that can be used as foundation for further research in the micro wind turbine area. Our literature review found that micro wind turbine is most effective to be implemented in rural/remote area. While the implementation for urban and domestic consumption face many challenge in social and management aspect. Furthermore it is found that the technology aspect is improving from the rotor, electrical control and battery in the last of seven years of micro wind turbine study.
Purpose: This project consisted of a technical study of the location of a wind microgeneration system and the collection of data that impact on said system at the La Bella farm in a rural area of the ...municipality of Acevedo (Huila, Colombia).
Theoretical framework: The Weibull distribution was used to statistical analysis of the data, which is the most widely used system for calculating wind potential.
Method/design/approach: The study was divided into two phases "previous study" and "intensive study", 95,760 data were collected in total and were statistically analysed using Weibull frequency distribution and WAsP software.
Results and conclusion: The average annual speed of 5.7 and 6.5 m/s, these being higher than the speed necessary to obtain an electric potential.
Research implications: It is concluded that the wind potential is 135.2 W/m2 and 186.2 W/m2 respectively.
Originality/value: The anemometer data acquisition device is an original design assembled for this study. The statistical analysis of the wind using the Weibull distribution was programming like mathematical model in Microsoft Excel and compared with the results obtained by the WAsP Climate Analyst software.
This paper presents the implementation of a sensorless speed controller and active rectification in a microwind turbine intended for battery charging. The controller was tested in a wind turbine ...emulator test rig using real wind data available from British bases in Antarctica. The control algorithm was successfully tested up to 14 m/s wind speed. Beyond this point, the electrical unbalance in the turbine generator compromised the stability and performance of the system. Also, a system efficiency comparison of different control algorithms is given to demonstrate the advantages of using active rectification instead of passive diode rectifiers in microwind turbines. This comparison was done between the sensorless control plus active rectifier, a dc-dc converter regulator, and the direct connection between the turbine and battery by means of a diode rectifier. The turbine with an active rectifier and sensorless control achieved the highest power coefficient over the range of wind speeds showing that this technique is an attractive and relatively low-cost solution for maintaining good performance of microwind turbines at low and moderate wind speeds.
PurposeThe purpose of the research is to concentrate on the most important smart metropolitan applications which are smart living, smart security and smart maintainable. In that, Power management and ...security is a most important problem in the current metropolitan situation.Design/methodology/approachA smart metropolitan area utilizes recent innovative technologies to improve its living, security and maintainable. The aim of this study is to recognize and resolve the difficulties in metropolitan area applications.FindingsThe main aim of this study is to reduce the metropolitan foremost energy consumption, to recharge the electric vehicles and to increase the lifetime of smart street lights.Originality/valueThe hybrid renewable energy street light applies smart resolutions to substructure and facilities in rural and metropolitan areas to create them well. This study will be applying smart metropolitan solar and wind turbine street light using renewable energy for existing areas. In future, the smart street light work will be implemented everywhere else.
Indonesia is an archipelago country and has significant wind energy potential. This paper investigated the potential of wind energy on the building based on location in Central Java Province, ...Indonesia. The results show that overall, Yogyakarta and Semarang, offers a much higher wind potential than other location. Four different sample models for buildings and houses are explained with CFD models. This study reports the investigation results of wind energy potential in building especially in Yogyakarta and Semarang. Hence, Yogyakarta has potential for high rise building that integrated with wind turbine and Semarang has potential for roof mounted-micro wind turbine.
From small-scale vertical axis wind turbines for urban usage to large-scale horizontal axis wind turbines for offshore wind farms, design, fabrication, and optimization technologies are highly ...required to manage wind energy effectively. Moreover, some new opportunities, such as in wind farm design, fluid–structure interaction, aero-acoustics, fabrication methods and performance tests by experimental and computational fluid dynamics should be engaged in modern wind turbine communities. The basic objectives of this book include improving the reliability and promoting the high efficiency of wind turbines as well as their dynamic performance, reducing wind turbine-generated noise and improving power generation efficiencies through high-fidelity approaches. Students, scholars, and engineers who manage such a wide range of wind turbine scales and usages, design, fabrication, and performance test protocols for various wind turbines, are highly recommended to read this book.
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