Research On Optimization Method Of Power And Load Coordinated Control Strategy For Large Wind Turbine Generator

With the growing population of the earth, the energy demand is also expanding, fossil energy exploitation and consumption is gradually rising, this will lead to the depletion of fossil fuels and the serious environment problem. In order to cope with this severe problem, people adopt two measures: one way is to limit the extraction of fossil fuel and optimize the industrial structure; the other way is to explore the new environmental energy. Wind power technology is gradually developed in this situation. Considering the unique of natural wind energy, it does not produce pollution and it has the characteristics of easily obtainment and recyclable, this leads the wind energy makes a difference in the field of new energy development and utilization. At the same time the wind power capacity also increases from a few watts to millions watts, the offshore wind turbine has been achieved and the wind turbines also upgrade the environmental adaptability. In addition, a large number of technical personnel have been trained. We now concern not only the efficiency of the wind turbine, but also how to control the load under the premise of guaranteed power, extend the life and ensure safe operation with the increase of the capacity.This paper studies the power and aerodynamic loads of the variable-speed and variable-pitch wind turbine below the rated wind. Firstly, to make a brief introduction of the development of wind power technology; and then to describe the basic aerodynamic theory of wind power, equivalent transformation. Do research on wind energy utilization efficiency of the wind turbine, the obtainment of maximum wind power, aerodynamic loads and other traditional issues based on these theories. Then focusing on problem due to the instability and volatility of the wind and blade fatigue loading at the rated wind speed, we propose the cooperative control of the II area power and load strategies. To combine the traditional pitch angle control with the flexible pitch control of transition, we build a wind turbine simulation model in Matlab/Simulink with the data of 200 kw wind turbine. Finally, to calculate wind turbine blade power and aerodynamic loaded by Matlab and Bladed.From the simulation and calculation results, the flexible transition zone pitch technology can help to reduce aerodynamic blade loads compared with conventional pitch control strategy of work zone II; and this proves the effectiveness of the control strategy.