Basic knowledge of wind turbines
First, the cognition of the wind
From a certain perspective, wind is a manifestation of solar energy.
1. The cause of the wind:
1 Earth's rotation
2 Temperature difference: the different states of the earth's surface are different from the heat absorption coefficient and the heat release coefficient of the sun, resulting in the difference in temperature between the air, resulting in the formation of wind. (If the water surface is slower than the heat absorption on the ground, the heat is also slow).
2. The trajectory of the wind
When the wind encounters an obstacle, it will form a turbulence.
Second, wind turbines
A wind turbine is a kind of power generation device that converts wind energy into electric energy, which converts wind energy into mechanical energy, and then converts mechanical energy into electric energy by a generator.
1. The technical principle of wind turbines
Three-phase three-phase uncontrolled bridge rectifier battery
(1) The generator is three-phase (ie, three wires), and the output three-phase should be mutually conductive. The resistance of the two lead-out wires is the same, and sparks may occur in any two wires.
(2) After the 12V battery is fully charged, the voltage will rise. Generally, the battery is considered to be full between 13.8V and 14.5V. When charging with wind, the battery voltage will be high, 1.1V~1.3V is the rated voltage, and the selection of various battery working states is different. 10.2V cut into the inverter. The generator frequency is monitored, the controller increases the monitoring point, and the voltage signal selects protection.
Wind energy - mechanical energy - electrical energy - electrical appliances
2. The wind turbine is actually a unit consisting of fan blades, generators and tail rudders.
(1) the most ideal blade
The larger the blade sweeping area, the greater the wind energy is received. Different designs of the blade side airfoil can increase the speed and reduce the resistance.
Blade theoretical limit value CP(max)=0.593
P∝SρO3*CP
(At present, the ideal CP value for large wind turbine blades is 0.48, the small fan is 0.48~0.36, and the CP value for HY series is 0.42.)
(2) High-efficiency generator
Generator efficiency:
Large generator 0.95
Small generator 0.6~0.5
HY series generator 0.74
Machine conversion efficiency:
Machine conversion efficiency = aerodynamic efficiency (CP value) * generator efficiency.
That is, the conversion efficiency of the HY series generator is: 0.42*0.74=0.28~0.3, which is much higher than the national standard of 0.24.
