直驱式永磁同步风电系统变桨距控制算法研究

以直驱式永磁同步风电系统为研究对象,在各部分数学模型的基础上,建立了整个风电系统的模型。基于此模型,考虑到风电机组非线性强、转动惯量大导致变桨距控制困难的问题,提出了基于模糊自适应PID和模糊前馈结合的变桨距控制算法并对该算法进行了仿真。仿真结果表明,当风速高于额定风速时,该控制算法能有效地控制风电机组的输出。最后在相同风速条件下比较了该控制算法与模糊控制算法、传统的PID控制算法的控制效果。比较结果表明,当风速高于额定风速时,虽然3种控制算法均能控制风电机组的输出,但是与模糊控制算法和传统的PID控制算法相比,本文提出的算法具有更好的稳定性和动态特性。

Research on Variable Pitch Control Strategy for a Synchronous Wind Power System with Direct-drive Permanent Magnet

Taking synchronous wind power system with direct-drive permanent magnet as the research object,this paper built the model of the whole wind power system based on the mathematical model of each part.In the model,the difficulty for pitch control caused by strong non-linear and large moment of inertia of wind power system was taken into account.A combined pitch control method on the basis of fuzzy adaptive PID and fuzzy feedforward was designed and the algorithm was simulated.The simulation results show that when the wind speed is above rated wind speed,the control algorithm can effectively control the output of wind turbines.Finally,the control effect of the designed controller was compared with fuzzy controller and the traditional PID controller under the same wind speed conditions.Comparison results prove that when the wind speed is higher above rated wind speed,although,all of the three controllers can control the output of wind turbines,however,compared with the fuzzy controller and the traditional PID controller,the proposed algorithm has better stability and dynamic characteristics.