The Study Of Brushless Dual-wind Wheel Direct-drive Wind Tuebine And Its Control Technology

With the rapid development of the global economy, energy depletion and environmental pollution have become increasingly serious. the world are actively to develop and use new energy of renewal, pollution-free and low-cost.Wind energy systems, especially wind power system's research and development have become the research focus of the field of new energy sources.Advanced technology containing Pitch control, variable speed and constant frequency is the research focus in wind power generation .The dual-wind wheel drives directly that is used in the proposed brushless dual-wind wheel direct-drive wind power generation system, which lets the unit's variable speed and constant frequency achieved through controlling the pitch angle of dual-wind wheel. It provides a new idea of research and development of a new wind turbine with independent intellectual property rights for our country.Combining with the 863 projects of country, by the name of the winding brushless doubly-fed wind turbine and control device ,a systematic study on the brushless double-rotor direct-drive generator and control system is accomplished.Firstly the structure of brushless dual-wind wheel direct-drive wind turbine and operating principle are studied, and the operation characteristics of the variable speed and constant frequency is analyzed, and detailed operation plan is also given. Based on the structure of the Dual-wind wheel brushless direct-drive generator and working principle,a mathematical model under two-phase rotating coordinate system and the model in MATLAB/Simulink environment are established and simulated.Useing industrial control computer of PC104 as a master, while the digital signal processor TMS320F2812 is as LCU(local Control Unit) in this paper, and a separate digital pitch-controlled system is built and have a detailed study about the key unit of pitch control system Data communication between Master and LCU is accomplished by the CAN serial communication network . Multi-task real-time control system is used in software systems of the master, the limits and levels of control tasks are rationally divided according to the control requirements, and the task duration are distributed accordingly , so overall efficiency of the software is greatly improved. AC sampling and digital analytical method are used to solve active power, reactive power and frequency signals at the data acquisition of system,and the hardware resources significantly saved.A prototype model has been done based on the theoretical research, and the experimental system of principles has been built for a systematic experimental study, which has laid a good foundation for further practical wind turbine of double- Wind wheel brushless direct-drive.