Research On Constant Speed Control Method Of Two-leaf Semi-rotary Structural VAWT

Energy and the environment have become the pressing issues to be solved which threaten human survival and development. Conventional fossil energy is extremely limited and it pollutes our living environment. Therefore, the development and utilization of renewable resources has attracted great attention around the world. Wind is from solar energy and its security, low-cost and large reserves make it become primary energy in new energy development.Wind power is the most important forms of human use of wind energy and wind turbine is the main device to capture wind energy. At present, the research on HAWT (horizontal axis wind turbine) has been matured and, the complete theoretical system about HAWT design and control has been established. VAWT (vertical axis wind turbine) is convenient to install, to maintain and, it has no noise. But the research on VAWT is much less. So far, there hasn't been complete theoretical system about VAWT analysis, design and control.In this paper, what we are to study is a two-leaf semi-rotary VAWT. This wind turbine is perfectly used semi-rotary structure, which not only improves the wind energy utilization efficiency of VAWT to a certain extent, but also overcomes the shortcoming of traditional two-leaf VAWT hard to start by itself. Compared with three-leaf semi-rotary VAWT, two-leaf semi-rotary VAWT has light, simple feature, low failure rate and high revolution speed at the same speed of wind. According to the characteristics of semi-rotary structure of VAWT, the relationship between structural parameters of VAWT and its wind energy utilization efficiency and the relationship between the blade attack angle and efficiency of VAWT were analyzed. The mathematical model of wind turbine is gained by method of rotating coordinate system and is simulated under the MATLAB platform. At last, the wind turbine of this structure was designed. In this paper, the pitch control method is used according to the characteristic of semi-rotary VAWT. From the mathematical model of VAWT, we know that the system of this VAWT is a non-liner system. Therefore, the conventional PID control algorithm is difficult to gain satisfactory control effect. In view of successful application of intelligent control technology in HAWT, the intelligent control of RBF fuzzy neural network is studied based on the mathematical model of wind turbine. And the simulation result shows that RBF fuzzy neural network control has better control effect compared with conventional PID control and, proves that RBF fuzzy neural network is feasible in the application of semi-rotary VAWT control system.