The amount of electric energy generated by each rotation of a wind energy generator is also different. For example, the most common 2MW direct-drive wind energy generator can produce 2,000 electric energy every 60 minutes when the wind energy is sufficient and stable. degree of electricity.
It takes 3.5 seconds for the fan blades to rotate once, and 60 minutes is 3600 seconds. Therefore, the amount of electricity generated by the generator per second is 0.56 degrees, so the amount of electricity generated by the wind energy generator fan for each revolution is The power generated is 0.56×3.5 seconds, which is 1.94 kilowatt-hours of electricity.
Extended informationBecause the wind volume is unstable, the wind turbine outputs alternating current of 13~25V, which must be rectified by the charger and then charge the battery to make the wind power The electrical energy produced by the generator is converted into chemical energy. Then use an inverter power supply with a protection circuit to convert the chemical energy in the battery into AC 220V mains power to ensure stable use.
Mechanical connection and power transmission: The horizontal axis fan blades are connected to the universal elastic coupling through the gearbox and its high-speed shaft to transmit the torque to the drive shaft of the generator. This coupling should be Has good damping and vibration absorption properties.
Performed by absorbing the appropriate amount of radial, axial and certain angular deflections, and the coupling can prevent the overload of the mechanical device. The other type is the direct-drive fan blades, which are directly connected to the motor without passing through the gearbox. Type of fan motor
Baidu Encyclopedia - Wind Turbine
The semi-direct drive concept was born out of the problems encountered in the development of direct-drive and double-fed wind turbinesin the process of large-scale development, taking into account the characteristics of both.
The difference between semi-direct drive wind turbine and direct drive wind turbine:
1. The principles of the two are different,
1. A direct-drive wind turbine is a generator directly driven by the wind, also known as a gearless wind turbine. This generator is driven by a multi-pole motor directly connected to the impeller, eliminating the need for a traditional component such as a gearbox.
2. The semi-direct drive wind turbine adopts one-stage or two-stage speed-increasing gearbox, multi-pole synchronous generator, and full-capacity converter. In addition, in order to reduce the weight of the engine room, semi-direct drive wind turbines are mostly compact models, that is, the low-speed shaft is eliminated or the length of the low-speed shaft is reduced, and the output shaft of the speed increase box is directly connected to the main shaft of the generator.
2. The advantages of the two are different
1. The direct-drive wind turbine does not have a gearbox, which reduces transmission losses and improves power generation efficiency, especially in low wind speed environments. , the effect is more significant.
2. The semi-direct drive generator rotates at a high speed. This feature determines that semi-direct drive can improve the reliability and service life of the gearbox on the one hand. At the same time, compared with direct drive generators, it can take into account the corresponding generator design and improve the design and manufacturing conditions of high-power direct drive generators.
3. The structures of the two are different.
1. Direct-drive wind turbineThe power generator uses a multi-pole motor directly connected to the impeller for driving, eliminating the need for a traditional component such as a gearbox. Since the gearbox is a component that is easily overloaded and has a high rate of premature damage in megawatt wind turbines, there is no direct-drive wind turbine without a gearbox.
2. The semi-direct drive concept was born out of the problems encountered in the development of large-scale direct drive and doubly-fed wind turbines, taking into account the characteristics of both. Structurally speaking, semi-direct drive is similar to double-fed and has the characteristics of various layout forms. At the same time, the spindle-less structure under current research also has a similar appearance to direct drive.
The above content refers to Baidu Encyclopedia - Semi-direct drive wind turbine
The above content refers to Baidu Encyclopedia - Direct drive wind turbine