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随着对风力机效率和可靠性要求的提高,现代风力机不再如传统风力机那样一味追求高的产能。本文针对桨距执行器故障的风能转换系统具有非线性性和参数严重不确定性,提出了基于LPV增益调度的风能转换系统的主动容错控制方法,降低故障对机组动态特性的影响。基于LPV凸分解方法,将风能转化系统非线性模型化为具有凸多面体结构LPV模型,利用LMI技术对凸多面体各个顶点分别设计满足性能要求的控制器,再利用各顶点设计的反馈控制器得到具有凸多面体结构LPV容错控制器。仿真结果表明,LPV增益调度技术可以成功地应用于风能转换系统的容错控制,在有故障的情况下,仍能保持系统的稳定和良好的动态性能。
With the increasing demand for efficiency and reliability of wind turbines, modern wind turbines are no longer pursuing high productivity as conventional wind turbines do. In this paper, the wind energy conversion system with pitch actuator failure has nonlinearity and serious parameter uncertainty, and an active fault tolerant control method of wind energy conversion system based on LPV gain scheduling is proposed to reduce the impact of failure on the dynamic characteristics of the unit. Based on the LPV convex decomposition method, the wind energy conversion system is modeled as LPV model with convex polyhedron structure. The controller of each vertex of convex polyhedron is designed to meet the performance requirements by LMI technique. Then the feedback controller of each vertex design is used to obtain the Convex Polyhedral Structure LPV Fault Tolerant Controller. The simulation results show that the LPV gain scheduling technology can be successfully applied to the fault-tolerant control of wind energy conversion system. In the case of fault, the LPV gain scheduling technology can still maintain the stability and good dynamic performance of the system.