Wind Turbine and Its Applications Shanghai Huaxin Electric Company's Chen Huashan Wind Energy is a non-polluting and inexhaustible source of energy. Wind power has been running in Europe for ten years. In the past decade, due to the attention paid to environmental protection and resources, this has provided opportunities for the development of wind power technology, and has also promoted the progress of wind power technology. According to the information obtained at the Hannover Fair in 2003, this paper proposes a brief introduction to the dynamics of contemporary wind power generation. 1. Wind turbine wind turbines are installed on conical tower tubes of tens of meters high. The roots of tower tubes are equipment. Warehouse, equipped with transformers, switch cabinets and other electrical equipment. Wind turbines are usually composed of rotating hubs, blade propellers, main shafts, transmissions, generators, lightning rods, anemometers and wind vanes (see figure). The main technical parameters of N80/2500 wind turbine are shown in Table I. Table 1 Device name parameters Blade number Blade diameter / m Power adjustment P stall control Start wind speed / m.sl rated wind speed / m wind stop wind speed / m. Limit wind speed /ni.s1 blade oar K: degree / m blade paddle material FRP (GRP) gear ç˜ type 3 composite gear ratio 芮 wheel ç˜ weight M / kg total ( domain (including generator) / kg power / kV hairstyle Asynchronous motor protection class Because wind energy has a wide range of changes, the wind power system has a complete set of control and adjustment devices, including the following parts.
(1) Strong wind stall control NOR-DEX built a wind speed of 9m/s for Norway. When the wind speed exceeds 25m/s, the fan will trip A to effectively prevent the fan from overloading during strong winds.
The company's fan is equipped with a control motor at the blade pad and hub connection (see figure). When the wind speed changes, the motor drives the blade paddle according to the controlled command to change its deflection angle accordingly. In this way, the fan can always be in an ideal state of operation::)) Other wind turbines that control NORDEX's wind power system are equipped with a programmable controller remote control, which can monitor more than 300 remotely through sensors such as temperature, hydraulic pressure and wind power. A different parameter. A juice computer equipped with remote control and telemetry software is arranged in the cabinet, and wind power is output to the grid through the thyristor.
The world's existing wind turbine installed capacity is 25 GW. It is predicted that the market sales of wind turbines in 2003 will be 2,300 kW higher than that of the unit, and the diameter of the B-buddle will be 82 m. Until the H, the company has 4,500 wind turbines operating around the world. They also The largest offshore wind farm in the belly world was built in Scotland.
The company has 2,141/1.8GW wind turbines operating in 29 countries including China, Russia, Britain, the United States, France and Germany.
The company built the world's largest coastal wind farm on the Norwegian coast, where 65 N80/2500kW wind turbines were installed, with a total power of 162.5 MW. The booth was set up and the company has built the world's largest The offshore generator set has a diameter of 14m and a power of 3600kW. The level of several major wind turbines participating in the exhibition and their wind turbines are shown in Table 2. Table 2 The country's largest unit power / maximum blade Diameter and Germany have more applications in Germany, and they can drive the K motor group that is slowly rotating in the wilderness on the highways of France, Holland and Germany. Due to the strong and stable wind power at sea, wind power in Europe will develop from land to sea in the next decade. According to reports, Germany has 20 GW of offshore wind resources and 125 GW of offshore wind resources in Europe. Some experts have demonstrated offshore wind power and considered it technically feasible. There are two main countermeasures to be taken: moving the equipment warehouse from the bottom of the tower to the top of the tower; the novel TXY series rare earth motor Huaibei Mining Group Co., Ltd., Yuli Coal Mine (Anhui), Huang Rulin, 1TXY series rare earth motor and Y series motor Comparison of main technical parameters Table 2TXY series rare earth motor and Y series motor application measured parameters comparison motor plastic number rated power / kW operating voltage / V working current / A power factor running speed / rmin -1 input power / kWTXY225S-818.537014.90.9757509. 31Y225S-818.537026.20.65474010.98 (Edit Xiao Xiang) AC motor products power saving TXY series rare earth motors use high permeability and high conductivity materials. It is embedded with a permanent magnet magnet composed of a rare earth material of NdFeB in the rotor cage. Therefore, this type of motor is called a permanent magnet high efficiency motor, which is referred to as a rare earth motor. It is characterized by the use of the finite element method of topology to optimize the magnetic field of the motor by computer CAD. It has a great innovation in the design of the rotor structure of the motor and the selection of electromagnetic parameters. It has become a synchronous motor with self-starting capability, effectively The active and reactive losses during motor operation are reduced. In the course of operation, it achieves high efficiency and high power factor, and also has better starting performance, and has higher traction synchronous torque (the synchronous torque is 1.1 times or more of the rated torque). And it has a large overload capacity (allows long-term operation under 1.2 times rated load, and the temperature rise will not exceed the allowable value). Compared with the Y series motor, it has a power saving rate of more than 12%, which is an ideal replacement for the conventional cage asynchronous motor. Its installation size and structure are the same as the Y series motors of the same model. This type of motor is ideal for applications where starting is infrequent and long-term operation is required.
When the earth motor starts, it relies on the interaction of the permanent magnet and the rotating magnetic field of the stator in the rotor cage, so that the motor runs synchronously from the asynchronous speed and synchronizes the rotational speed of the rotor with the rotating magnetic field of the stator. The rotation speed is consistent, that is, there is no slip, thus eliminating the copper and iron loss on the rotor: In addition, the rotor of the thin seven motor is excited by the magnetic steel, so that the excitation current of the stator winding is reduced and the no-load loss is reduced. It is. In general, the total loss of rare earth motors is reduced by more than 30% compared with ordinary translational motors, and the efficiency and power factor are greatly improved. It is obvious from the main technical parameters in Table 1 that the rated current of the rare earth motor is reduced by 22.89%, and the power factor and efficiency are further reduced by 25%. , 5.56% or more, obviously has a good power saving effect.
2. Practical application effect The mine coal preparation plant and other ground workshops first promoted the use of some TXY series of rare ten motors. The TXY225S -8 type motor used in the coal preparation plant is taken as an example, and compared with the Y225S-8 ordinary motor. The data is listed in Table 2. As can be seen from the data in Table 2, the operating current of the TXY225S -8 rare earth motor is 43.13% lower than that of the Y225S-8 ordinary motor, the power factor is increased by 49.08%, and the input power is reduced by 5.2: - 18.5 kW rare earth motor If you run 300rf every year, run 12h every day, and you can get 电能h of electricity every year. If the current average price of electricity entering the mine is 0.49 yuan/kW.h, the annual electricity cost will be 2945.88 yuan. Although the rare earth motor is about 1/3 higher than the ordinary motor in price, it is more cost-effective to promote the value h by calculating the comparison.
It should be pointed out here that the efficiency and power factor of the asynchronous motor change with the increase of the load rate, and only when the load rate reaches 70%~100%. Therefore, the rare earth motor is particularly adapted to the condition that the load is not constant. If the motor capacity is selected according to the maximum load, it is better to operate it in a less high operating load range, and the power saving rate is higher.
(2) The surface of the outer casing should be treated with seawater resistance.
Of course, due to offshore operations, the foundation of towers and the installation of equipment will be more complicated, so the investment in building offshore wind farms will increase by 50% compared to land investment. The installed capacity of offshore wind farms in Europe is 100MW. NORDEX and BONUS have built offshore wind farms. GE has built the 3600kW offshore wind turbine 18 (546) group, and NORDEX is developing a 5000kW offshore wind turbine for offshore, strong winds and high output. It is estimated that by 2006, several GW of wind turbines in Europe will be put into operation at offshore wind farms.
It should be pointed out here that China also has abundant wind energy resources. According to experts, it is estimated to be about 3200 GW, mainly distributed in the northwest and coastal areas. At present, NORDEX has sold 56 sets/88.3MW wind turbines to China, and China is likely to become a world-famous wind turbine market in the future.
Although the technology of wind power generation is complex and the investment cost is large, because wind energy is a non-polluting energy source and an inexhaustible source of energy given to human beings by nature, wind power generation will become a An important investment project for the development of new energy in the world.
Energy generator development
Forklift Mast Rollers are generally found running between the inner masts and four lift mast rollers run between the outer and the inner masts. The mast is located at the frontal part of a forklift and its purpose is to raise and lower loads. The mast rollers transforms the forces and moments that derive from the fork carrier, into the mast and into the frame. It is an extremely important component of the mast as it enables the vertical movement of the fork carriers, while maintaining its structural rigidity.
Mast rollers are available in two fitting series, HULR and LRQ. HULR series consists of two rows of contact Ball Bearings. Whereas, LRQ series consists of a single row of four point contact ball bearings. The bearings are structurally engineered to be capable of supporting great axial, radial, and moment forces. The rollers have crowned outside surface that consists of outer rings, which prevents edge loads, due to the possibility of a misalignment. While the inner roles are designed to be of a singular piece to be easily installed, which translates to cost savings.
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