Design And Research Of Driving Mechanism Of Smart Blades Based On Load Optimization And Power Control

Wind energy as a renewable clean energy, provide us a feasible direction of solution for energy and environmental problems in today’s society. With the rapid development of global wind power, the related technologies, the installed capacity of wind turbines, rated power and structure size are also increasing. This proposes higher requirements for the new technology of wind power development and research. The main impact load of the wind power generation system comes from the blade, which has a direct impact on the utilization ratio of wind power, its performance determines the stability of wind energy grid control. Traditional mode of variable speed and variable propeller power regulation has difficulties to achieve fast response to wind load in the modern large-scale wind turbines, for its large moment of inertia and needing large driving power. New adaptive intelligent turbine blades which arise at the historic moment, this article is based on the big background of intelligent blades, according to the principle of electro- magnetic- mechanical coupling effect, proposed and designed a kind of built-in quick response load management drive structure for the turbine blade, to optimize the turbine blade’s load and control the power. In this paper, in order to realize the electric- magnetic- mechanical coupling drive mechanism, we focus on the basic theory of the aerodynamics and electromagnetism, the design and optimization analysis of the drive structure, dynamics modeling and simulation analysis, prototype realization and test and semi-physical simulation control and so on. The main contents are summarized as follows:(1) The relevant base theories of wind turbine blade’s aerodynamic model are introduced, the design schemes of changing the partial contour of blade by built-in drive structure at different locations are proposed and studied, the air flow field simulation is compared and analyzed by FLUENT, and at last the intelligent blades’ built-in drive structure’s design parameters are determined by the results of the simulation.(2) Based on the design parameters, combined with electric- magnetic-mechanical coupling principle, the preliminary designing scheme of the electromagnetic- permanent magnet drive system is determined. According to the related design principle and calculation method of electromagnetism, the mathematic model of the drive structure is established. The load conditions and the design requirements of the system are verified by the ANSOFT Maxwell finite element simulation of electromagnetic analysis. Combined with the existing airfoil prototype, the modal analysis and structure optimization of the key components of the drive system is carried out by ANSYS.(3) The detailed design process of the electromagnetic- permanent magnet drive structure is elaborated. And the system is simplified to the spring- oscillator model in the combination of quality, rigidity and damping, and the dynamics equation of the driving system is established.(4) The control simulation of the driving system, the performance testing process of drive prototype and the construction of the experimental test platform are introduced. The wind turbine’s load optimization and power control process are semi-physical simulated by the MATLAB and SIMULINK.