变速恒频双馈风电系统的H2/H∞混合控制

Mixed H2/H∞ control for variable-speed constant-frequencydouble-fed wind generation system

针对外界未知扰动、随机变化的风速等不确定因素,建立了变速恒频双馈风电系统小信号改进数学模型,该模型解决了原风电模型中存在的部分耦合和非线性问题。基于H2/H∞混合控制算法,设计变速恒频双馈风电系统状态反馈控制器。通过求解Riccati方程得到H2/H∞混合控制问题的解。该控制器在保证系统具有一定鲁棒性的前提下,使控制效果得到改善。以某工况下的实际工程参数为基础,通过仿真,验证了该控制方法的有效性。

A small signal improved model of the VSCF doubly fed wind power system, aiming at unknown external disturbance, random variation of wind speed and other uncertain factors, is established. The new model solves the partially coupled and nonlinear problems in the old model. Based on mixed H2/H∞ control algorithm, a VSCF doubly fed wind power system state feedback controller is designed. The solution of the problem of robust H2/H∞ control is obtained by solving the Riccati equations. The controller can improve the control effect under the condition that the system is robust. The effectiveness of the control method is verified by the simulation based on the actual engineering parameters in a certain working condition.