1. The devices required for wind power generation are called wind turbines. This kind of wind turbine can be roughly divided into three parts: wind wheel (including tail rudder), generator and iron tower. (Large-scale wind power stations basically do not have tail rudders, and generally only small ones (including household types) have tail rudders)
2. Because the rotation speed of the wind turbine is relatively low, and the magnitude and direction of the wind force change frequently This in turn makes the speed unstable; therefore, before driving the generator, a gearbox must be attached to increase the speed to the rated speed of the generator, and a speed regulating mechanism must be added to keep the speed stable, and then connected to the generator on board. In order to keep the wind rotor always aligned with the wind direction to obtain maximum power, a tail rudder similar to a wind vane needs to be installed behind the wind rotor.
3. The frequency of the power grid is generally fixed. In China, it is 50HZ, 4-pole generator, its synchronous speed is 1500r/min, and 6-pole generator, its synchronous speed is 1000r/min. So When the speed of the wind wheel is lower or higher than the synchronous speed of the generator, it cannot be connected to the grid to generate electricity (the allowable range is 97-103% of the synchronous speed).
4. The rated wind speed is the wind turbine The wind speed generated when working normally and operating at optimal efficiency under matching power belt force.
5. When the wind speed is low, by changing the ratio of the tip speed of the wind wheel to the wind speed , and change the pitch angle to enable the wind turbine to achieve the maximum capture of wind energy.
Is the 1.5 MW wind power a breeze power generation?
The wind turbine does not rotate slowly. Represents low efficiency. In fact, it is more interesting. During normal operation, the efficiency is highest when the speed is slower than the rated speed, but the net power to the Internet is relatively small. (Wind turbine is a kind of power generation equipment. Each type of wind turbine has its own specific rated power/speed/operating wind speed, etc. There is a global optimal value of wind energy capture efficiency in its impeller design, which corresponds to a specific set of (variable The combination of propeller angle) and (blade tip speed ratio), generally speaking, the pitch angle is close to 0 degrees, and the blade tip speed ratio is about 7 to 8. The basic principle in the design of wind turbines is to be able to capture. When the power brought by aerodynamic energy is less than its rated power, the wind energy should be captured as efficiently as possible, but it cannot exceed some constraints, such as its rated speed. When the aerodynamic energy that can be captured is greater than its rated power, the capture of wind energy should be actively reduced. Maintain the rated power. Friends who know more about it may know the power curve. As the wind speed gradually increases from the cut-in wind speed, the steady-state power curve can be basically divided into three segments: the part below the rated speed. In the load section, the pitch angle is optimal at this time, and the blade tip speed ratio is optimized by adjusting the motor load torque, thereby maintaining the optimal capture efficiency of the impeller. The efficiency of this section of the advanced low-speed fan can reach 50. %+, which is very good, but the output power is only less than half of the rated power. Within this range, the wind speed increases and the speed increases linearly. At a certain wind speed, it reaches the rated speed of the impeller, and then the next paragraph: located at Rated speed partIn the load section, at this time, the pitch angle is still near 0 degrees, and the impeller always works at the rated speed (fluctuations are allowed, but the set value is the rated speed). The speed is maintained by adjusting the motor load torque, and the blade tip speed ratio is no longer Optimal. As the wind speed increases, the motor load increases linearly, reaching full power at a certain wind speed (that is, the rated wind speed). After the wind speed exceeds the rated wind speed, it continues to the next section: the full power section, and the motor load torque can no longer continue. Increase to reduce the impeller speed. At this time, the pitch angle needs to be increased to reduce the capture of wind energy. As the wind becomes stronger, the pitch angle gradually increases (non-linearly), and finally cuts out when the cut-out wind speed is reached. The rated speed of the low-speed fan is only 10 rpm, and the minimum operating speed may be only about half in the first section of the power curve, so it seems very slow, but if the impeller you see is indeed very slow. It is relatively constant, no more than two or three revolutions per minute, which is usually when the car is warm and ready to start. If the rotation is just noticeable and cannot make one revolution in a few minutes, it is usually in the parking state and is just feathering. The wind load cannot be completely zero. There is a small torque that can just overcome the damping in the transmission chain and push the impeller a little.
The wind power of 1.5 megawatts (MW) is not. Breeze power generation usually refers to power generation when the wind speed is low. Generally speaking, breeze power generation is suitable for environments where the wind speed is between 2-7 meters/second. This type of wind turbine is usually small in power. Operating under low wind speed conditions. And 1.5 MW wind power refers to a wind turbine with a rated power of 1.5 MW, which means that it can generate electricity at 1.5 MW per hour, which is relatively large for this power level. Moderate to high wind speed conditions. Therefore, 1.5 MW wind power is more suitable for generating electricity under higher wind speed conditions and can provide larger power output. In summary, 1.5 MW wind power belongs to medium to high wind speed conditions. Generate electricity, not breeze.