Sun Spot (Sun Small Programmable Object Technology) is a wireless sensor network (WSN) mote developed by Sun Microsystems. The device is built upon the IEEE 802.15.4 standard. Unlike other available mote systems, the Sun SPOT is built on the Java 2 Micro Edition Virtual Machine (JVM).

The Sun SPOT project explores wireless transducer technologies that enable the emerging network of things. We are building a hardware and software research platform to overcome the challenges that currently inhibit development of tiny sensing devices.

These ....etc

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ABSTRACT
Wind from the Sun is a new technology for obtaining power from the sun and wind. This hybrid system turns the sun's light into heat, then uses that heat to create a wind within a horizontal large-diameter pipe. The wind inside the pipe is converted into electric power using a series of wind turbines.
1. The Collector: A large area of land is covered with a material with low reflectivity (dark in color). This material converts the sun's light into heat.
2. Heating the air: The collector increa ....etc

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Wind Power and Wind Turbines
Pressure
Wind – what causes it?, cont.
Pressure differences cause the flow of fluids (gases and liquids)
pressure is always measured relative to some reference pressure
Sometimes relative to vacuum  absolute
Sometimes relative to atmospheric pressure
Prevailing Winds
Wind – what causes it?, cont.
Weather Processor Symbols
WXP Legend
Review Question 1
What causes wind?
Air pressure
Weight of the atmosphere
Pressure difference in atmosphere
Low pressure
High p ....etc

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In nature, it is solar power that creates wind power. Consider the example of the sea breeze. The sun heats both land and sea, but the land heats up more quickly and reaches a higher temperature than the sea. The air over the land becomes hotter than the air over the sea and the hot air rises, creating an area of lower air pressure (close to the surface). Air moves from the area of higher pressure over the sea to the area of lower pressure over the land. The cool sea air heats up as it moves over the land and so it rises, creating a cycle. The ....etc

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ENHANCED PERFORMANCE OF A DOUBLY FED
WIND-POWER INDUCTION GENERATOR AT WIND-
RANGE BOUNDARIES
ABSTRACT
The doubly fed induction generator (DFIG) is one of the largest generators used
with MW-class wind turbines. This paper focuses on the weak performance areas
of grid-connected DFIG-based wind turbines. Basically, the DFIG performance at
low wind speeds, close to the cut in speed, and around the full rating operation (in
the vicinity of rated wind speed) is investigated. For low wind speed region, the
c ....etc

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Methods for Reduction of Voltage Unbalance in Weak Grids Connected to Wind Plants



1 INTRODUCTION
The location of wind turbines is based on wind properties. Normally, areas with good wind resources are geographical remote. The cost of the electrical power grid connecting the wind plants should be as low as possible. The voltage quality in a weak power grid may be poor, and unbalanced voltages can occur. Induction machines are attractive as wind turbine gener ....etc

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Sun Spot (Sun Small Programmable Object Technology) is a wireless sensor network (WSN) mote developed by Sun Microsystems. The device is built upon the IEEE 802.15.4 standard. Unlike other available mote systems, the Sun SPOT is built on the Java 2 Micro Edition Virtual Machine (JVM). The Sun SPOT project explores wireless transducer technologies that enable the emerging network of things. We are building a hardware and software research platform to overcome the challenges that currently inhibit development of tiny sensing devices. These change ....etc

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