基于自抗扰的变速恒频双馈风力发电机并网控制研究

摘要

A control strategy is presented for no-load cutting -in of VSCF doubly-fed wind power generator, which combines the vector control, nonlinear function and auto/active disturbances rejection control ( ADRC) .The mathematic model of doubly-fed wind power generator is a nonlinear coupling system in d-q coordinates.The system is divided into two parts,"dynamic coupling"and"static coupling", and embedded auto/active disturbances rejection controller in parallel be-tween the input vector and the output vector to realize the linearized decoupling of rotor voltage.The simulation model of VSCF doubly-fed wind power generation system is established with Matlab.The simulation results show that the generator can be flexibly connected with power grid under the proposed control strategy.The proposed control strategy realizes the decoupling control of active and reactive power of stator output and has a good performance.Compared with PI control strategy, ADRC controller shows a better dynamic response performance.%将矢量控制技术、非线性函数和自抗扰技术相结合,提出了一种新型的变速恒频双馈风力发电机空载并网控制策略. 双馈异步风电机在dq坐标系下的数学模型是非线性耦合系统. 采用把系统分成"动态耦合"部分加上"静态耦合"部分的方法,并且在控制量和输出量之间并行地嵌入自抗扰控制器来实现转子电压线性化解耦. 利用Matlab软件搭建变速恒频双馈风力发电系统的仿真模型,进行仿真分析. 仿真结果表明,所采用的控制策略能够完成双馈异步发电机的柔性接入电网,并网运行效果理想,实现了定子输出有功功率与无功功率的解耦控制. 与PI控制策略相比,自抗扰控制方案具有更好的动态响应性能.