With coal, oil and other gradual depletion of conventional energy sources, human more and more emphasis on new energy sources (non-conventional energy) the development and utilization. New energy refers to the traditional energy sources other than the various forms of energy such as solar energy, geothermal energy, wind energy, ocean energy, biomass, and nuclear fusion energies. One unique advantage wind has become widely accepted. Compared relative to other new energy, wind energy has three main advantages: first, the reserves are large and widely distributed; second can be used to strong, relatively low cost; third, green energy, do not pollute the environment.
The use of wind energy as a clean energy, wind power increasingly important in environmental protection today, is playing an increasingly important role. In recent years, the global wind energy market, more than 40% annual rate of rapid development, and China with abundant wind resources and government support the development of new energy sources, following the United States and Europe to become the world’s most important wind energy market, which to the Chinese Wind Energy the equipment manufacturing industry has brought opportunities for development. China’s wind energy resource-rich, theoretical reserves of 1.6 billion kilowatts, the actual available capacity of 250 million kilowatts, with great potential for development. The same time, the country’s new energy development plan, the wind power industry as a key support to make our wind power industry, has a broader development prospects.

Therefore, wind power in recent years has maintained a doubling in 2008 by the GDP growth rate of wind turbine, but there were more than 80% localization ratio has exceeded 70%. To wind energy industry, healthy and sustained growth, it is necessary to complete the construction of industrial system, the construction of industrial chain. Branch company should seize the opportunity to develop a timely response to the needs of product lines and solutions, was successfully applied in a number of wind farms.
Second, the composition of horizontal axis wind turbines
Based on wind energy more efficient collection and use of wind power industry is currently the main horizontal axis wind turbines, its composition as shown on the right:
Rotor blade: to capture wind energy and converts it into rotational shaft energy;
Shaft: The rotation can be converted into kinetic energy generator;
Transmission: used to increase the rotor shaft between the center and generator speed;
Generator: Using the rotating shaft can, through the principle of electromagnetic energy;
Yaw controller (not shown): Moving the rotor to be consistent with the direction of the wind;
Brake System: In the case of an electrical overload or system failures, stop shaft rotation;
Tower: support the rotor and the engine box, and will enhance the position of the entire device;
3, wind power generation control system
Wind power generation system as the core part of the field of wind power generation, its technical innovation is essential. At present mainly uses constant speed constant frequency and variable-speed constant-frequency wind generator system two broad categories. In wind power, when the wind turbine and the power grid, the required frequency of wind power is consistent with the grid frequency, that is, constant frequency. Constant speed constant frequency wind power generation process that is to maintain the speed windmill (ie the generator speed) remains unchanged, and thus obtain constant frequency power. In the process for Windmill wind speed wind speed change, but through other control method to get the constant frequency electric power is called variable speed constant frequency.
As the wind and the wind speed is proportional to the cube, when the wind speed in a certain range of changes, if allowed to do a windmill speed movement, to achieve better use of wind energy purposes. Windmills to convert wind energy into mechanical output power factor of the efficiency of CP can be expressed, CP in a round of weeks to determine the wind speed ratio λ (blade tip speed and wind speed ratio), the maximum value. Constant speed constant frequency wind turbine generating units remain unchanged, while the wind speed and often changing, apparently CP can not be maintained at optimum value. Variable Speed Constant Frequency unit is characterized by a windmill and the generator speed can change within a wide range of frequencies without affecting the output power. As the variable speed wind turbine, can be properly controlled so that windmills weeks speed ratio at or near the optimum value, thereby maximizing the use of wind power generation. Therefore, VSCF wind power generation system with its high wind energy utilization factor can be absorbed by the wind energy produced by mutation in order to avoid fluctuations in spindle and drive mechanism to put too much torque and stress, and can improve system power factor and other outstanding advantages, in the wind power industry, become increasingly popular.
Variable Speed Constant Frequency control function is to ensure the quality of Internet power, it is necessary to measure the speed of the generator and fed back to the controller to achieve closed-loop control. The current generator speed detection mainly uses rotary encoder. At the same time due to large power generators will produce shaft currents, if the encoder with the generator is not insulated, then the axis current will be the introduction of the encoder and thus damage the encoder. Appropriate section’s EV88P series of encoders unique mechanical design concept, to ensure that the product of anti-vibration shock resistance, using an advanced electrical design in Europe to ensure that the product temperature of -40 ~ 85 ℃ under the conditions of reliable output, while the use of advanced insulation treatment technology to effectively prevent current on the encoder shaft damage. EV88P Series encoder, with its excellent performance characteristics and stable operation has been in North China wind power equipment manufacturer to achieve a successful application of the stable operation of the wind farm to be customer recognition.

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