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Research on Control Strategy and Simulation of Vertical Axis Wind Turbine

Author: YangJing
Tutor: LiuZhanFang
School: Chongqing University
Course: Engineering Mechanics
Keywords: VAWT Maximum Power Point Tracking Control Simulation
CLC: TK83
Type: Master's thesis
Year: 2009
Downloads: 192
Quote: 0
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Abstract


The rapid progress on wind energy conversion technology has made wind energy to be one of the most important renewable and sustainable energy. Current wind energy conversion system translates the wind energy to mechanical energy by wind turbine, and then converts it to electricity by generator. According to the direction of the revolving shaft in space, wind turbine includes two types, one is horizontal axis wind turbine (HAWT for short), and the other is vertical axis wind turbine (VAWT for short), the vertical axis wind turbine is famous for Darrieus type. There has been growing attention to vertical axis wind turbine for its unique structural and aerodynamic advantages.As variable speed wind turbine works at larger ranger of wind speed, utilizes much more wind energy, Improve the efficiency of wind turbines. So it has become the hot topic in the field. This paper is basic on large variable speed vertical axis wind turbine. The wind turbine is Darrieus type, and it dives permanent magnet synchronous generator directly. Through establishment of aerodynamic performance evaluation model, dive-train model, generator and control system model, and simulating of the wind turbine system model in MATLAB/SIMULINK, we can obtain the performance of wind turbine in a variety of conditions, and achieve the algorithm of Maximum Power Point Tracking.Although variable speed wind turbine Improve the efficiency it Increase the difficulty of the control system. The Maximum Power Point Tracking control Strategy theory is analyzed in this paper. The aerodynamic performance evaluation model is established, it’s the double-disk multiple stream-tube model in the framework of blade element momentum theory, the airfoil dynamic stall effect and aerodynamic losses were included. we obtained the aerodynamic performance by calculating for the 1MW Darrieus vertical axis wind turbine, such as the relationship between aerodynamic torque and rotating speed at different wind speed, the relationship between aerodynamic power and rotating speed at different wind speed. It has provided a basis for the next simulation. The drive train model, permanent magnet synchronous generator model and Maximum Power Point Tracking model have been established. The generator model is established at synchronous rotating coordinate system. And we have analyzed the decoupling control of synchronous generator. The Maximum Power Point Tracking is based on tip speed ratio control method. Finally, the entire system model is established in MATLAB/SIMULINK. The starting at low wind speed, braking at high wind speed and operating at variable wind speed of 1MW vertical axis wind turbine have been simulated. The performance of the wind turbine is obtained during the simulating. The algorithm of Maximum Power Point Tracking is achieved. The use of tip speed ratio control method is Significant for Maximum Power Point Tracking. It has laid the foundation for further design of the vertical axis wind turbines control system.

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CLC: > Industrial Technology > Energy and Power Engineering > Wind energy, wind machine > Wind machinery and equipment
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