The super-large wind turbines that we commonly use, which stand on top of a mountain, or wind turbines standing on the seashore, have a slower speed.
Does the faster it turns, the higher the efficiency of power generation? So how much electricity can they generate in one turn?
Goldwind 1.5MW wind turbine generating capacity calculation method:
Goldwind wind turbine
(1) Each wind turbine has a rated power , for example, we I often hear or see 1.5MW, 2MW, 3.5MW onshore wind turbines. 4.5MW, 6MW, 8MW and even 10MW offshore wind turbines.
1MW=1000KW, then a 1.5Mw wind turbine, the rated power of the generator is roughly 1500KW. Common generators are not very accurate at 1500KW, and may be a little more. For example, Goldwind’s 1.5MW rated power is 1580KW.
(2) Each fan will have a rated speed , which is the speed of the fan when the rated power is reached.
Goldwind part of the 1.5MW unit parameters
Here you need to set a condition: in the full load state, the wind turbine can generate electricity in one hour:
1500KW* 1h=1500Kw/h, which is 1500 KWh, then at full load, that is, when the wind speed must reach the rated speed: we take 17.3 laps as the reference value for the rated speed. (You can also take 20rpm).
When the wind turbine is at full load, the power generated by one rotation is: 1500Kw/h ÷ (60x17.3) circle=1.445Kw/h.
The same data can also be calculated directly according to the parameters of the fan,2.5MW, 10MW wind turbine generating capacity in one lap at full load.
Note: The number of turns here is the number of turns of the blades, not the data of one turn of the generator.
Mingyang Smart 4MW Wind Turbine One-turn Power Generation Calculation Method:
Mingyang Smart Wind Turbine
We also set in the full load state, the generator enters the rated power generation stage.
Look carefully at the parameter table of Mingyang Smart's 4MW wind turbine, you will find that he did not mark the rated speed of the blades, and he marked the rated speed of the generator.
Mingyang Intelligent 4MW wind turbine parameters
Assuming that when the rated speed is reached, the power generation in one hour is 4000KW/H, the rated speed of the generator, there are two forms, we take 252rpm this type of generator Reference.
So how do you calculate how much the blades are turned?
Looking down on the parameters carefully, Mingyang's intelligent fan uses double-fed, that is, the blades rotate to drive the gears, which are transmitted to the generator through the second-stage gears.
Take a look at the speed ratio What is the speed ratio: 21.01, Then the rated speed of the blade is 12rpm.
Transmission ratio
This can be calculated. Under the rated power state, the power generation of a 4MW fan of Mingyang Smart is:
4000KW/h ÷ (60x12) rpm=5.56 kWh.
This power generation is still very powerful.
must be,Look clearly: What I said earlier is the power output of a wind turbine in one circle under the rated power state. That is to say, the wind speed must reach the rated wind speed. [Knowledge points, avoid lifting bars]
When the wind speed is less than the rated wind speed, the output power of the generator is less than the rated power, and when the wind speed is greater than the rated wind speed, the output power of the generator is stable at the rated power.
The relationship between wind speed and wind turbine output power
Shanghai Electric SEG-1250 wind turbine wind curve
Here is a Shanghai Electric SEG-1250 wind turbine wind curve model, (data from: influence wind turbine Power factor analysis He Jing)
Seeing this curve, although it is fuzzy, it is easier to understand.
Before the wind speed reaches the rated wind speed, the blade speed is relatively slow, not reaching 12 revolutions per minute (4MW wind turbine), or when the 1.5MW wind turbine does not reach the speed of 17.3 revolutions per minute.
The power of the generator has a positive correlation with the wind speed.
Use a low-power wind turbine to easily see the data.
The relationship between wind speed of 1000w wind turbine and generator output power
Here, we can actually make an empirical judgment based on the actual situation.
Most onshore wind turbines can only reach about 70% of the power generation. Then a 1.5MW wind turbine rotates once and only 1.01 kWh of electricity, 4MW sea breeze generators, according to the normal state of the wind farm is better The state can reach 80% of wind power. One turn is 4.448 kilowatt-hours of electricity.
Actually, it may be slightly less efficient than mine.
[Follow: Robot observation, learn basic industrial knowledge together]
Direct drive permanent magnet wind turbine
.
