Abstract
Exploitation of wind energy with vertical axis rotary-wing has advantage over horizontal axis rotary-wing in areas where the wind is turbulent and unstable, i.e., with fast changes either in direction or velocity as normal happens in urban areas. The Darrieus-type vertical axis rotary-wing is experiencing a growth in interest for development and installation due to a growing interest in decentralizing energy conversion. This growth is expected to be in further augment in what concerns the way of the future, i.e., the smart grid environment. A problem linked with this Darrieus-type rotary-wing is the complexity in the performance prediction study, since the blades move around the rotor in 360°. An approach to the double-multiple streamtube performance prediction model for the vertical axis rotary-wing is offered in this paper, offering a flexible adapted tool when the airfoils lift and drag data are not available, or when more complex blade profiles of rotary-wings are in development. A new Darrieus-type vertical axis rotary-wing design is carried out with the approach offered, allowing for a self-start capable blade profile, having an adequate performance at high tip speed ratios. Several field tests are offered providing validation to the self-start, low noise and stable performance of the new rotary-wing design. Also, a modeling, control and simulation of grid integration are presented.
Highlights
The world population growth and social development drives the increase on energy utilization [1]
An approach to the double-multiple streamtube performance prediction model for the vertical axis rotary-wing is offered in this paper, offering a flexible adapted tool when the airfoils lift and drag data are not available, or when more complex blade profiles of rotary-wings are in development
This paper presents a development for a straight bladed Darrieus-type vertical axis rotary-wing wind turbine (VAWT) enhancement in urban areas in a smart grid environment
Summary
The world population growth and social development drives the increase on energy utilization [1]. The increase of renewable energy share in the mixed of electric power production is a fact responsible for augmenting the complexity of Energy Management Systems [2,3]. In urban areas the exploitation of solar energy has more acceptance than wind energy, the need for environmentally sustainable housing, for instance, the new EU directives regarding sustainable development, drives an opportunity for looking at the exploitation of wind energy systems in buildings [4]. The advantage of VAWT over HAWT is concerned with: insensitivity to yaw wind direction changes; smaller number of components; very low sound emissions; ability to generate energy from wind in skewed flows; three dimensional structural design, easier to integrate in urban architecture; ability to operate closer to the ground level. The Darrieus-type VAWT has a natural inability to self-start and several solutions have been presented to overcome this problem, such as: external electricity feed-in, guide-vanes [12], hybrid configuration of Savonius and Darrieus VAWT [13], blade pitch optimization [14], blade form
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