基于全鲁棒滑模控制双馈风力发电系统空载并网控制研究

Study on no-load cutting in control of doubly-fed wind generation based on global robust sliding mode control

为解决PI控制在双馈风力发电机并网控制中自适应和鲁棒性差等问题,文章根据定子磁场定向矢量控制方法和全鲁棒滑模控制方法,设计了双馈风力发电机的空载并网控制策略,引入带指数函数的时变因子项,消除到达阶段;并在切换控制中引入状态误差,提高状态的收敛速度和削弱抖振。通过与PI控制进行仿真比较,结果表明,所设计的全鲁棒滑模控制策略对电网电压波动和电机参数摄动具有较强的全局鲁棒性,且响应速度快,稳态误差小,保证了定子电压的稳定性,能有效实现空载并网。

According to the stator field-oriented vector control technique and the global robust sliding mode control technique, a control strategy of doubly fed wind generator was designed for solving the problem of poor adaptiveness and robustness of the PI controller for no-load cutting-in control of doubly fed wind generator, in the design of switching function,a variable factor with exponential function was introduced to eliminate the reaching phase; In order to improve the convergence speed of state and weaken the chattering of the control system, a state error was introduced to switching control. Comparing with the PI controller,the simulation results show that the global robust sliding mode controller has strong global robustness against grid voltage fluctuation and motor parameter perturbation, ensures the stability of stator voltage and can effectively realize the no-load cutting-in with a quick response and less steady-state error.