Classification Of wind Energy Conversion System: The classification of wind energy conversion systems are based on different orientation which are discussed below: On the basis of axis of rotation Horizontal axis machines Vertical axis machines On the basis of size if machine Small scale (up to 2 KW) Medium scale(2-100 KW) Large scale (100 KW and up) On the basis of output power DC Output DC generator Alternator rectifier AC Output Variable frequency, variable or constant voltage AC Constant frequency, variable or constant voltage AC On the basis of rotational Speed Constant speed with variable pitch blades Nearly constant speed with fixed pitch blades Variable speed with fixed pitch blades On the basis of utilisation of output Battery Storage Direct connection to an electromagnetic energy convertor Other form of storage Inter connection with conventional electricity utility grids. Horizontal-axis wind turbine (HAWT): A in which the axis of the rotor's rotation is parallel to the wind stream and the ground. All grid-connected commercial wind turbines today are built with a propeller-type rotor on a horizontal axis (i.e. a horizontal main shaft). Most horizontal axis turbines built today are two- or three-bladed, although some have fewer or more blades. The purpose of the rotor is to convert the linear motion of the wind into rotational energy that can be used to drive a generator. The same basic principle is used in a modern water turbine, where the flow of water is parallel to the rotational axis of the turbine blades. The wind passes over both surfaces of the airfoil shaped blade but passes more rapidly over the longer (upper) side of the airfoil, thus creating a lower-pressure area above the airfoil. The pressure differential between top and bottom surfaces results in aerodynamic lift. In an
Classification Of wind Energy Conversion System: The classification of wind energy conversion systems are based on different orientation which are discussed below: On the basis of axis of rotation Horizontal axis machines Vertical axis machines On the basis of size if machine Small scale (up to 2 KW) Medium scale(2-100 KW) Large scale (100 KW and up) On the basis of output power DC Output DC generator Alternator rectifier AC Output Variable frequency, variable or constant voltage AC Constant frequency, variable or constant voltage AC On the basis of rotational Speed Constant speed with variable pitch blades Nearly constant speed with fixed pitch blades Variable speed with fixed pitch blades On the basis of utilisation of output Battery Storage Direct connection to an electromagnetic energy convertor Other form of storage Inter connection with conventional electricity utility grids. Horizontal-axis wind turbine (HAWT): A in which the axis of the rotor's rotation is parallel to the wind stream and the ground. All grid-connected commercial wind turbines today are built with a propeller-type rotor on a horizontal axis (i.e. a horizontal main shaft). Most horizontal axis turbines built today are two- or three-bladed, although some have fewer or more blades. The purpose of the rotor is to convert the linear motion of the wind into rotational energy that can be used to drive a generator. The same basic principle is used in a modern water turbine, where the flow of water is parallel to the rotational axis of the turbine blades. The wind passes over both surfaces of the airfoil shaped blade but passes more rapidly over the longer (upper) side of the airfoil, thus creating a lower-pressure area above the airfoil. The pressure differential between top and bottom surfaces results in aerodynamic lift. In an
87221197-Wind-Turbine.docx