BASICS OF WIND ENERGY, TYPES OF WIND MILLS

BASICS OF WIND ENERGY, TYPES OF WIND MILLS

1. UNIT IV POWER FROM RENEWABLE ENERGY Hydro Electric Power Plants – Classification, Typical Layout and associated components including Turbines. Principle, Construction and working of Wind, Tidal, Solar Photo Voltaic (SPV), Solar Thermal, Geo Thermal, Biogas and Fuel Cell power systems.

2. Wind Energy

3. Renewable Electric Capacity Worldwide

4. Wind Turbine Operates

5. Theoretical Power Generated by Wind Turbine Power = ½ ( ρ )(A)(V) 3 A = swept area =  (radius) 2 , m 2 V = Wind Velocity, m/sec. ρ = Density of air

6. Components of Wind Turbine

7. Components: Rotor - The hub and the blades together are referred to as the rotor. Wind turns the blades which turn the drive shaft. Shaft - Two different shafts turn the generator. One is used for low speeds while another is used in high speeds. Gear Box- Gears connect the high and low speed shafts and increase the rotational speeds from about 10-60 rotations per minute to about 1200-1800 rpm, the rotational speed required by most generators to produce power. Generator - The generator is what converts the turning motion of a wind turbine's blades into electricity. Tower - Tall tubular metal shaft. The taller the tower, the more power produced.

8. components Storage : storage systems are used to store energy when there is excess power developed and to discharge it when there is a lack in power. Energy convertors Usually, the electricity produced from wind energy is direct current. Using alternator convert it to AC before supply to power grid

9. Turbines : Two Types Horizontal Axis Wind Turbines Vertical Axis Wind Turbines

10. Advantages and Disadvantages Vertical Axis Advantages Can place generator on ground You don’t need a yaw mechanism for wind angle Disadvantages Lower wind speeds at ground level Less efficiency Horizontal Advantages Higher wind speeds Great efficiency Disadvantages Angle of blade is relevant Difficult access to generator for repairs

11. Types of wind mills